Model Boat Mayhem

Masterclasses => VOSPER MOTOR TORPEDO BOAT BUILD => Topic started by: jimmy2310 on June 29, 2011, 09:47:42 pm

Title: Q & A - GLYNN GUEST plan, for the beginner
Post by: jimmy2310 on June 29, 2011, 09:47:42 pm
BB,

 I have just started the very same model myself yesterday, I have only got as far as making the templates has you have done on your first post and I'm so glad of all the info and pictures you have posted they are going to be a great help to me,
I will try and post pics of my build as I go along

thank you very much

Jimmy
Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: Martin (Admin) on June 29, 2011, 10:26:30 pm

  What a great build John.    :-))
Title: Re: Q & A - GLYNN GUEST plan, for the beginner, how to print?
Post by: RaaArtyGunner on June 30, 2011, 11:09:38 am
What happens if I click on the print button at the end of John's excellent Vosper build.  :-)) :-)) O0 O0

Will it just print all the text,  {:-{

Or text and images.

If not, how do I print out the build sequences as set out by John, with corresponding photos.
Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: LarryW on June 30, 2011, 05:06:46 pm
HI JOHN, what a great build ,   how about HDML NEXT  ?  still ploding on with mine   LARRY....
Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: Cypriana on June 30, 2011, 08:33:59 pm
Hello

Many thanks for a really helpful article.

I have just started this build myself (it will be my first) so the masterclass could not have come at a better time.

Cheers

Kevan
Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: LarryW on June 30, 2011, 08:59:08 pm
HI ARTYGUNNER, just go to top of page click rh mouse print , this will bring in printer dialog choose page set up choose paper then set up set print all with preview  this will show all 145 pages
    hit print then put the kettle on   CHEERS LARRY
Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: RaaArtyGunner on July 01, 2011, 08:57:02 am
HI ARTYGUNNER, just go to top of page click rh mouse print , this will bring in printer dialog choose page set up choose paper then set up set print all with preview  this will show all 145 pages
    hit print then put the kettle on   CHEERS LARRY

Hi Larry,
Instructions were simple,  :-)) but printers have a mind of their own,  {:-{ {:-{ but succeeded in the end, many thanks. O0 O0
Could have also washed the car. {-) {-)
Thanks  again.
Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: LarryW on July 01, 2011, 09:26:09 am
HI  good show , also you wash mine     LARRY.. O0  {-)
Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: scout on July 02, 2011, 10:21:12 pm
Looks very much like MTB 102 if the rear gun is removed. Great article anyway.  Yours Scout
Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: tica on July 07, 2011, 09:21:32 pm
Looking great  :-))

I'm right now working on the GG Miami tender and this plan is up next  %%

In between I'm working on the MTB 49 Thorny Craft = hard to get information that one.

BR
Carsten
Denmark
Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: murphy1570 on September 25, 2011, 12:57:33 am
Hello folks
Does anyone think it may be feasible to use 2mm liteply to sheet the hull sides rather than balsa, any advice critical or otherwise woeld be appreciated.
Thanks all the best,John
Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: John W E on September 25, 2011, 09:42:23 am
hello there,

yes, it will be quite feasible to build this model in 2mm lite ply.   I think the points to look out for would be:

You would have to build the keel up with several layers of lite ply to get the correct thickness, say 3-4 layers.

Also, you may have to double up on one or two of the ribs to make them a little thicker.

Using lite ply for the skin and decks plus bridge would be okay.

I am just about to complete the model of Virgin Atlantic Challenger which is supposed to built using balsa wood.    I opted to use lite ply in its construction.   This has turned out okay.

Just thinking about though, the advantage of lite ply over balsa for skinning is that I was able to use a 2 part finishing epoxy on the lite ply for  the Atlantic Challenger and sand away to me hearts content to obtain the finish on the hull that I wanted without fear of cutting into the timber.   Whereas, if you use the tissue/dope method you have to get this on the hull pretty smooth to begin with and you have to be more precise rather than haphazardous like me.

Aye
john e
bluebird
Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: murphy1570 on September 26, 2011, 01:00:40 am
hello there,

yes, it will be quite feasible to build this model in 2mm lite ply.   I think the points to look out for would be:

You would have to build the keel up with several layers of lite ply to get the correct thickness, say 3-4 layers.

Also, you may have to double up on one or two of the ribs to make them a little thicker.

Using lite ply for the skin and decks plus bridge would be okay.

I am just about to complete the model of Virgin Atlantic Challenger which is supposed to built using balsa wood.    I opted to use lite ply in its construction.   This has turned out okay.

Just thinking about though, the advantage of lite ply over balsa for skinning is that I was able to use a 2 part finishing epoxy on the lite ply for  the Atlantic Challenger and sand away to me hearts content to obtain the finish on the hull that I wanted without fear of cutting into the timber.   Whereas, if you use the tissue/dope method you have to get this on the hull pretty smooth to begin with and you have to be more precise rather than haphazardous like me. The photos of your build

Aye
john e
bluebird
Hello John
Thanks for your reply and advice I will have a go at using liteply for skinning the hull ans also the decks and bridge, but I will stick with balsa for the framework, and follow your excellent buid article in conjunction with the model boats article, I am a relative newcomer to building model boats although I have a bit of experience in building and flying radio controlled model planes from some years ago using these materials, and lI to can be a wee bit heavy handed when it comes to the finer arts of sanding balsa and trying to seal it, and I like your idea of the two part epoxy finish to prepare for painting. I think your build of the Atlantic Challenger look gret and has helped convince me to try the liteply method,
Thanks all the best, John.
Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: Delrod on November 23, 2011, 10:11:25 am
Hi

I have just joined the forum. Have started building the Glynn Guest Vosper and needed some more help, after seeing this I have had all my questions solved. What a great piece of work and very helpful.

I have had the plans enlarged from A1 size to A0 size making the boat just over 36" and making it a about a 1/24th scale. Some challenges but now seeing this will help me even more. I have already made a lot of the details parts even the cowls myself, now just assembling the hull.

Great site and thanks again
 
Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: John W E on November 24, 2011, 07:09:42 pm
hi all glad the build is of some assistance - it was an enjoyable build.   I have noticed though that there are 2-3 pics missing at the end of the completed model.   An oversight by Our Leader when I kindly asked him to watermark the photographs.  So, here are a few pics of the finished model.....

aye
john e
bluedird
Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: vernon on March 23, 2012, 07:03:06 pm
Hi, I have recently retired and have not built models for some time. I am interested in the Vosper MTB but did not get the June 2011 model boat. Can I purchase the plans from the model boat store or are they not available any more.

Vernon
Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: John W E on March 23, 2012, 08:16:16 pm
http://www.myhobbystore.co.uk/product/34696/model-boats-magazine-june-2011

hi Vernon you can purchase the plan and magazine from Myhobbies store see the link above

aye
john
Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: vernon on April 03, 2012, 01:58:16 pm
Thanks for the info. Obtained a copy no problem. In trying to kit out a set of parts following Glynn's comments I do not seem to be able to get either the Graupner 451/1 propeller or a 267mm prop tube.
I have tried Graupner website and although they list the 450 and 452, I cannot find any reference to the 451. Glynn's comments on the running performance related to this particular prop seems to indicate the need for a 30mm 2 blade prop.
The only prop tubes I can find are 254 or 280mm versions. I realise that i could adapt the 280mm but as a first model for some years I am trying to make it an easy start.

Can anyone throw any light on the subject or offer alternatives.
Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: John W E on April 03, 2012, 02:25:02 pm
Hi vernon
can i ask which method of motor installation you are going to use - is it the one that Glyn used in his build using a solid coupling or are you going to use a flexible coupling as in the build I did ?

 

aye

john

 
Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: vernon on April 03, 2012, 03:05:17 pm
John

Thanks for replying. I have just started to read through the build notes outlined on this site and see the alternative mounting which I presume allows for the use of a 227mm prop shaft using a flex coupling which is what I will use. It also uses a 3 blade 35mm prop. Is there any particular type as I presume the pitch is critical. I was planning to use a 545 motor.
Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: John W E on April 03, 2012, 06:39:03 pm

Hi there, what I did was go down to the lake with a few props (I purchased some props of various diameters from Cornwall Models ) they were all 2 blade racing props - Trial and error to get the performance worked for me.   The one I used and got the best performance from was a 2 blade 32mm diameter prop.  The 3 blade prop which you can see in the picture of the build was one of the 'testers'.     Here's the link - I think it would be good for you to do a trial test as well to see which is best for your motor/model.


http://www.cornwallmodelboats.co.uk/acatalog/propellers_2303.html

aye
john
Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: AndreZS1AZ on April 12, 2012, 05:09:11 pm
Hi folks,
  Just joined this site as I need some help.  Have a Glyn Guest plan for a PT boat, Model Boats 1999.  I have cut the deck, bulkheads, etc.  The plan is not very accurate, but never mind.  I am looking for a supplier of the shaft, propellor and gears.  No hobby shop in South Africa is able to help.  The clubs keep everything secret.  Can anybody help me out here.  Will pay for the items.
Andre   
Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: John W E on April 12, 2012, 06:18:54 pm
HI YA

if you have a look at the link for Cornwall Model Boats - they supply all the required bits and pieces for model boating - I am sure they will post to South Africa you know - just click on the link above and it will take you to Cornwall Models website.
http://www.cornwallmodelboats.co.uk/index.html
aye
john
Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: AndreZS1AZ on April 12, 2012, 07:32:10 pm
Thanks bluebird,
  I will give those guys a try.  Just a correction, I did not mean that Glynn's plans were inaccurate, I think it was the printers etc. that got it wrong.  Who knows, I might start posting my buils of the PT boat here.
Andre 
Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: hazegry on January 14, 2013, 12:29:10 am
any idea where to get the plans as the magazine seems to not be selling them now it lists the magazine as 0.00 with no buy button?
Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: John W E on January 14, 2013, 12:36:28 am
Hi Hazegry will this help  :-))
 
http://www.myhobbystore.co.uk/product/41695/vosper-mtb-mm2062 (http://www.myhobbystore.co.uk/product/41695/vosper-mtb-mm2062)
 
aye
john
Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: hazegry on January 14, 2013, 01:26:59 am
sure does thanks allot.
Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: DavidHughes on August 07, 2015, 11:01:06 am
Hi

I have recently got hold of the plans for this - planning to build one over the winter, and try to "up-scale" it a bit...

Had an idea of diagonal planking the hull (ie as per the original construction method), using coffee stirrers or similar (with tissue or glass cloth covering) rather than simply sheeting with balsa...

Would this work do you think?
Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: TheLongBuild on August 07, 2015, 12:20:23 pm
Hi

I have recently got hold of the plans for this - planning to build one over the winter, and try to "up-scale" it a bit...

Had an idea of diagonal planking the hull (ie as per the original construction method), using coffee stirrers or similar (with tissue or glass cloth covering) rather than simply sheeting with balsa...

Would this work do you think?

Yes   :-))
Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: DavidHughes on August 07, 2015, 12:31:50 pm
Am sure I'm just making it harder for myself, but wanted to try it anyway!!'
Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: John W E on August 07, 2015, 06:29:48 pm
Hi ya David

May I ask you to err on the side of caution; as when increasing the size of models from Plans and altering the builds; you can run into all sorts of problems.   Maybe not so many problems for an experienced builder, but for a person who is relatively new to the hobby - personally I would advise you to build this model as it (straight from the Plans) and this would enable you to see how the model goes together, how you actually fit up the power drive chain and so forth.   Whereas what you are asking to do - which is quite possible to do - you can start to run into problems.

When you start to diagonally plank like you want to do and also increase the size of the model - you will have to begin to think about putting extra support in - e.g. stringers on the sides and on the bottom - these are strips of wood to support the diagonal planking in the middle of the planks.

Basically this design for this model doesn't lend itself too readily for doing this. So that is why my suggestion is to stick to the plan size for the model and minimise the problems that you are going to create for yourself.

If you are really into this type of style of model - the Marine Modelling International Magazine (last month) did a free plan for an RAF Rescue Launch which I believe Stavro is building.   This is an actual twin motor model and it looks a very interesting build but built of a similar style as Glyn Guest.   Also a while back the same magazine did a free plan for a Vosper MTB semi-scale and this one is the same as the Airfix MTB is.

When you have built your skills up; you then possibly may go on to building from plans such as Vic Smeed's plans/John Pritchard's plans.     Have a look at MyHobbiesStore at the style of plans and also have a look at the MasterClass build and you will see an Air Sea Rescue Launch which I built and diagonally planked.   Also if you do a search you will come across the RTTL which I built.   This is also diagonally planked.

Hope I haven't put you off too much and dampened your spirits but good luck with what you choose.

Last but not least, going back to the Glyn Guest MTB; you can really add a lot of detail to this model and make it look something really nice.  Do a web earch on the MTB  :-))

aye John
Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: John W E on August 07, 2015, 06:32:22 pm
 :-))
http://www.myhobbystore.co.uk/product/16744/raf-rescue-launch-mm1320
http://www.myhobbystore.co.uk/product/16860/bpb-70ft-motor-gunboat-mm1280
http://www.myhobbystore.co.uk/product/16885/thorneycroft-mtb-mm337
Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: DavidHughes on August 07, 2015, 06:45:35 pm
Hi
 
Thanks for the info - think I misled you a bit - by "up-scale" I meant detailing it up from semi scale...rather than making it bigger!  Think I got my terminology confused...
 
I wanted to use a build log I found of the Italeri MTB77 plastic kit as further detail to try and add a bit more realism - adding deck tools, fitting out the bridge etc.  The plans you've highlighted also look really good
 
Do you think the diagonal planking would work on the basic hull frame (keel, chine-floor and deck) at the planned size (26" I think?) I guess the plank span from keel to chine would be c3 inches?
 
Don't want to bite off more than I can chew, but also keen to try new things!
 
BTW - I've just started going through your build log of the 63ft whaleback ASR - Its such a beautiful design, and they way you've built it is really inspiring me to try the same one day...!  Only thing is that it seems such a shame to cover up the planking!
Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: Stavros on August 07, 2015, 08:16:29 pm
Bluebird is correct in his assumptions I am indeed building one at the moment and it is well on it way,very easy boat to build...alas not diagonally planked but straight ply sides.

Dave
Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: pete-c on August 25, 2015, 09:12:44 am
Hi

I am having problem obtaining the June 2011 Magazine. Has anyone a copy that they could could sell me. I only need the article on the Vosper.

Regards
Pete
Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: Onetenor on November 29, 2016, 05:45:53 am
Bluebird is correct in his assumptions I am indeed building one at the moment and it is well on it way,very easy boat to build...alas not diagonally planked but straight ply sides.

Dave


I once saw a ply sided hull scored or pencil marked hull stained and grained to look like planking.Very clever  John Mantova
Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: mtb36 on November 16, 2017, 10:10:23 pm
great build - I did a scratch build on a PBM hull and made my anchor in exactly the same way, well done
Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: Steven.T on July 24, 2021, 08:39:46 pm
I realise it's been a few years since this was updated but still, hope someone can help!
I'm looking at getting the plans and wood pack for this, don't suppose it's possible to build it with two motors is it? Fancy something with a bit more umph and maybe using a mixer to get the motors to do a bit of steering.
Cheers!
Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: TheLongBuild on July 24, 2021, 08:47:30 pm
No reason not to put 2 in if that's what you want.
Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: Steven.T on July 24, 2021, 08:55:13 pm
Haha yeah, I was more concerned if there was enough space!
Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: John W E on July 25, 2021, 05:01:44 pm
Hi ya there Steven.T


With regards to fitting 2 motors into Glynn Guest's MTB, you may be hard pressed for space.   Unless, you use 400 motors, which are smaller than the standard 550 which was fitted into the model I built.   When you say you want extra 'umph' in your model; it may be come very unstable - which has happened to me on another model that I built (an MGB) fitted a speed 550 in from Graupner and on a 7.2 battery she comes up on the plane and the tork of the motor actually twists the model, making it very unstable at high speed.


So, I suppose if you wished, you could fit a brushless motor in your model with Lipo's.   However, my own thoughts are bog standard 550s with standard prop - these models do perform pretty good.


Couple of pics to show you :-)



Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: Steven.T on July 25, 2021, 05:13:08 pm
Thanks for the relpy John.
I appreciate the extra pictures too. Yours looks like it goes pretty quick anyway!
I also fancied the twin motors to help with steering a bit, just something I've never really tried before.
I'll have a look when it arrives, I am tempted to go brushless, had good experiences with them in R/C cars.
Thanks
Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: John W E on July 25, 2021, 05:17:02 pm
Hi ya Steve


With the size of the MTB model and size of rudder the steering is pretty agile with the set up.   So, there would be no benefit steering wise, apart from, say, where you would be able to 'turn on a sixpence' at a standstill.   You would be better off picking a larger model to go twin.   Apart from more room for the motors and that also better stability.


John

Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: GG on July 25, 2021, 05:20:53 pm
Steven T,
              John W E speaks a lot of sense about this model, in this type of model a single 500 type of motor with a six cell Nimh battery pack will give you good performance.  Any more power and you might be come a danger to yourself and others.
If you have to use two motors then something like the suggested 400 types would be OK.  Not sure what you would gain, save the ability to rotate the model with independent control of the motors, as with a single motor and rudder, it is fast but predictable and safe, sort of scale fast electric.


Glynn Guest
Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: Steven.T on July 25, 2021, 05:34:01 pm
John, Glynn, thanks for the replies.
Sounds like it might be fast enough as is then, I couldn't find any videos of these so wasn't sure on the speed side of things. I might just go single prop brushless of an equivalent size. I'll have a think about the steering!
Thanks for your help!
Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: John W E on July 25, 2021, 05:37:49 pm

Hi ya there Steve


If you are set on building a model with twin motors (easy build) I have had a quick look through Sarik's plans and I believe the Vosper one is a twin motor and I know you can purchase build pack for it as well.   I think this may have been a free plan in Marine Modelling magazine.



Vosper MTB379 - Sarik Hobbies - for the Model Builder (https://www.sarikhobbies.com/product/vosper-mtb379/)




The 2nd plan - I am not 100% sure if this was a free plan in Marine Modelling magazine as well  I don't think there is a wood pack for it.   



RAF Rescue Launch - Plan - Sarik Hobbies - for the Model Builder (https://www.sarikhobbies.com/product/raf-rescue-launch-plan/)


Magazine Exchange is a good place to have a look for these 2 magazines - also - the inevitable Ebay may also have these magazines - but - do check and make sure the plans are included if you do buy them.   


I will have a look to see what year the magazines are - if you interested in them.
Marine Modelling Magazine, April 2011 Issue (magazineexchange.co.uk) (http://magazineexchange.co.uk/cw/marine-modelling-magazine-april-2011-issue.html)


Marine Modelling Magazine, July 2015 Issue (magazineexchange.co.uk) (http://magazineexchange.co.uk/cw/marine-modelling-magazine-july-2015-issue.html)

John
Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: Steven.T on July 25, 2021, 05:49:07 pm
Thanks John,
I've actually already ordered Glynns MTB plans and wood set as of Friday night. I hadn't seen the RTTL but I had seen the MTB379. I decided there didn't seem to much in size difference between the two, Glynns was cheaper and having built one of his before I knew they make a nice easy model. I hadn't realised the MTB379 was twin motor, never mind!
Sadly looks like Glynns original article is unavailable, might have to check ebay or just use your write up!

Cheers
Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: TheLongBuild on July 25, 2021, 10:11:33 pm
What was the plan reference of the one you ordered ?.
Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: Steven.T on July 25, 2021, 10:13:03 pm
Not sure, This is the link if thats any help?
https://www.sarikhobbies.com/product/vosper-mtb/

Cheers
Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: TheLongBuild on July 25, 2021, 10:21:16 pm
OK, do you want a copy of the article ?, if so PM me your email address.
Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: John W E on July 26, 2021, 09:39:00 am
This may help you out Steven .


Model Boats Plan Vosper MTB by Glynn Guest & Magazine June 2011 Vol.61 Issue 727 | eBay (https://www.ebay.co.uk/itm/234100824641?hash=item36817f1a41:g:bDoAAOSwT3Zgmv4n)


John
Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: Tug Fanatic on July 26, 2021, 10:28:46 am
It is an interesting idea to use a rigid coupling and then remove the top bearing of the propshaft to substantially reduce alignment issues.
Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: Circlip on July 26, 2021, 10:30:27 am



 Why not 360s and make it triple screw?  O0  Can never understand the need for speed in a scale or semi scale model? If it was scaled up to full size, would the equivalent speed be possible? Can't remember ANY of the full size MTBs or ASRLs being able to turn on a tanner. Orses for corses. %%


  Regards  Ian.
Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: GG on July 26, 2021, 12:54:15 pm
Tug Fanatic,
           The idea of a rigid coupling sans top tube bearing did work out OK.  It does however remove one barrier to water entering the model but this is not a problem with the proper set up at the bottom end of the prop tube.


Glynn Guest
Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: John W E on July 26, 2021, 04:35:19 pm
The build article for the MTB basically follows what Glynn had written in the magazine.  The only time that I differ from what is written in the article is the 'off the shelf' coupling I use and also the motor mount that is also shop bought.  The motor now is mounted upside down using plywood supports plus also location of the battery.  The battery in Glynn's article is mounted across the hull.   I made a battery box that runs the length of the hull in line with the keel.


John
Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: Steven.T on August 03, 2021, 09:38:08 pm
Hoping someone here can help...
I've followed the plan to assemble the keel, I cut the keel inline with the drawings to have room for the prop tube at the right angle etc, added the doublers etc. Everything lined up against the drawing when I was building it. However the 228mm prop tube I've ordered seems way too short, if I push it up far enough to get a hold on the coupling, with the bearing just about poking out of the keel top, then the shaft isn't long enough at the other end and the propeller will foul against the keel, it seems about 20mm short from the drawings. Have I done something wrong here or do I just need a longer prop?
Only other thing I can think that would fix it is to cut a fair chunk out of the keel and doublers so the coupling sits futher into the keel, but not sure if this is right.
Thanks
Steven


(https://live.staticflickr.com/65535/51356444110_373023099e_k.jpg) (https://flic.kr/p/2mfccAW)PXL_20210803_202831070.MP (https://flic.kr/p/2mfccAW) by Steven Trotter (https://www.flickr.com/photos/193564715@N05/), on Flickr

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Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: TheLongBuild on August 03, 2021, 11:20:58 pm
Personally I really would not take the plan too literally and do what you think is best, just move the prop away from the keel by 1-2mm by angling it higher at the motor side, or as you say get a longer shaft.
Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: John W E on August 04, 2021, 09:06:56 am
Hi ya Steven


Three questions :-)  are you following instructions of the book


or - the article on here?


1.   The shaft length that you mention seem to correspond to the same shaft length that I used.


2.   What type of coupling are you using?


3.   How are you going to mount the motor?


If you are following Glynn Guest's build, you are going to require a longer prop shaft and a solid coupling.


If you are following the build I did, you will need to cut part of the keel away further and part of the bottom support to accommodate the coupling I used.  Also, you will need to mount the motor upside down which I did - because of the space you will require.


Here is a picture for you.


Title: Re: Q & A - GLYNN GUEST plan, for the beginner
Post by: Steven.T on August 04, 2021, 11:00:13 am
Thanks John,
I'm sort of referencing both the magazine and your write up, but mainly yours.
I'm sure the shaft in the magazine is the same length too, 228mm. But the drawing says 267mm which seems like it would fit on mine.
 I'm using the same coupling as yourself, a flexible one. I was planning on mounting the motor upside down like yours although mine is brushless and possibly shorter.
Looking at it I think either cutting away like you had to would work, or a longer prop would work. I guess the longer prop would be less damaging now it's mostly assembled.
Cheers
Steven