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Author Topic: Sheerline Trafalgar Class  (Read 8347 times)

Subculture

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Re: Sheerline Trafalgar Class
« Reply #25 on: April 23, 2012, 05:03:49 PM »

What's wrong with the usual Raboesch or Huco style Hardy Spicer coupling? Easy to mix and match the shaft sizes, about a fiver from the local hobby store, and should easily take the strain. Also Prop Shop do some nice couplings, but you might have to wait a week or two, you know what Simon is like.....

http://www.cornwallmodelboats.co.uk/acatalog/raboesch-couplings.html

http://prop-shop.co.uk/index.php?id=26&section=services&sub_section=products&product_type=26

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Re: Sheerline Trafalgar Class
« Reply #26 on: April 23, 2012, 06:17:25 PM »

Huco style coupling I have already got two of them in situ on the out side of the WTC didnt realy want to put another one inside thats why I used the silcone type flexible inside. I think I am going to have to move the motor a bit further back to get another Huco coupling in. I know I will get there eventualy  <*<
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Re: Sheerline Trafalgar Class
« Reply #27 on: April 23, 2012, 06:20:38 PM »

Just had a quick word with Nigel, he'll knock you up a solid joint if you want one, Mark.
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Rich

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Re: Sheerline Trafalgar Class
« Reply #28 on: April 23, 2012, 06:47:19 PM »

Okay. It doesn't mater that much really how many you have, the main thing is to insure they're well aligned to prevent noise.

You can get Oldham couplings, they are very robust and allow for a little misalignment. A solid coupling will also work fine providing there is no misalignment.

http://www.rpmechatronics.co.uk/shop/products.php?2910&cPath=27_38_194

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Re: Sheerline Trafalgar Class
« Reply #29 on: April 23, 2012, 06:52:19 PM »

Why not do as I (and an awful lot of people) do...fix everything in position with a solid coupling, once all is set and glue hardened off, replace the solid coupling with a Huco or similar...job done.
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Rich

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Re: Sheerline Trafalgar Class
« Reply #30 on: April 23, 2012, 08:14:55 PM »

Motor and seal in end cap are dead centre true I have just moved the motor back and cant get the tube back together so its back to the drawing board the Huco coupling in the wtc is to big for the purpose Andy the link you put up is a great thing but 10 days lead time. I will go to Steve Webbs in the morning and see if he has anything maybe use a tamiya dog bone on it that would be smaller.

Rich Thanks, if I cant get sorted tomorrow I will defo give you a shout

Quick question if I took the gearbox off the motor what differance would it make to powering the sub ??

Regards Mark
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Re: Sheerline Trafalgar Class
« Reply #31 on: April 23, 2012, 08:59:45 PM »

It'll just bog down, get hot and draw a load of current. The gearbox is there to reduce RPM and importantly increase torque, so you can drive that 2.3" propulsor nice and easy.

You can get motors that deliver 2500-3000RPM without reduction, but they tend to be bigger, heavier, and are quite difficult to source, definitely not the kind of thing you will find at your local model shop.

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Re: Sheerline Trafalgar Class
« Reply #32 on: April 23, 2012, 09:07:29 PM »

Chears for that Andy will have to source  a differant motor for the vanguard over the next few days cant be bothered with altering the tube now thanks again Andy
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Re: Sheerline Trafalgar Class
« Reply #33 on: April 23, 2012, 09:32:25 PM »

Why do you need a different motor? You won't find anything significantly more compact other than a 385 geared motor, which may be powerful enough seeing as you found the 500 a bit lively. You can get Oldham couplings from other places too you know.

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Re: Sheerline Trafalgar Class
« Reply #35 on: April 24, 2012, 12:11:44 PM »

Hi Mark,

Yeah no worries.

regarding your problems with vanguard, is the motor shaft alignment out?? do you have space for a seperate motor wtc as per Ramesh's Tireless build??
Also regarding couplings the std huco should be good for upto 3000rpm, Failing that if its internal ie within in wtc then perhaps mobile marine models coupling.

Dont know if andy has suggested but engel do a solid coupling, 3.17mm to 4mm or 4mm to 4mm,
if your looking at this route re coupling i should have a couple of engel couplings spare.

Might even have a lavayette motor mount and shaft seal going about........
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Re: Sheerline Trafalgar Class
« Reply #36 on: April 24, 2012, 12:26:33 PM »

Mark needs 6mm to 4mm. 6mm is the output from the MFA gearbox.

Building a separate motor WTC would require a complete refit I think, and isn't really needed.

Huco couplings can be run above 3000 RPM, it greatly depends on the load you place on them.

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Re: Sheerline Trafalgar Class
« Reply #37 on: April 24, 2012, 05:10:20 PM »

Mobile marine models, There couplings can do upto 8mm and there not that expensive. avaliable threaded or plain.

They also do shafts etc to order.

 
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Re: Sheerline Trafalgar Class
« Reply #38 on: April 24, 2012, 05:28:43 PM »

Does nobody know a tame engineer? A swift visit, a donation of tea bags/milk and a bag of sugar....and a fiver or so in the guys pocket. Job done.

Find a friendly engineer, look after him, nuture him, buy him a bottle of scotch at Xmas....it'll be the best thing you ever did.


Rich




















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Rich

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Re: Sheerline Trafalgar Class
« Reply #39 on: April 25, 2012, 10:53:23 AM »

found this little tinker in one of my box`s going to attempt to drill one side 6mm as it only 4mm as you can see it is tiny compared to the red Huco coupling hopefully it will work



thanks for all your help guys

Regards Mark

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Re: Sheerline Trafalgar Class
« Reply #40 on: April 25, 2012, 11:21:29 AM »

Tricky business to accurately open out a coupling like that, chances are you'll wind-up with an off-centre hole and a coupling that runs eccentric causing vibration.

Might be tolerable as you're only doing low revs.

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Re: Sheerline Trafalgar Class
« Reply #41 on: April 25, 2012, 12:54:11 PM »

didnt work not enough sidewall for the grub screw to tighten down so it looks like the Vanguard will be dumped in the shed as a project still underway to be finished when ever
Thanks to all for the help on this.

Regards Mark.
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Re: Sheerline Trafalgar Class
« Reply #42 on: April 25, 2012, 12:58:29 PM »

Mark...send me a drawing of what you want, with measurements, and I'll send it off to Nigel for you.


Rich
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~~~~~~~  "Motorflotes need love too...."  ~~~~~~~

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Re: Sheerline Trafalgar Class
« Reply #43 on: April 25, 2012, 01:05:31 PM »

What are we talking here. A coupling 20-25mm long to accept a 6mm shaft at one end and 4mm shaft at the other?

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Re: Sheerline Trafalgar Class
« Reply #44 on: April 25, 2012, 03:02:39 PM »

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Re: Sheerline Trafalgar Class
« Reply #45 on: April 25, 2012, 03:22:18 PM »

Wasn't it something like that he had in there originally, that went bang?

Perhaps you could try replacing the tubing on the coupling you have. Polyurethane tubing is a pretty strong stuff, B & Q sell it, not sure if they'll have the right size for your coupling though.

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Re: Sheerline Trafalgar Class
« Reply #46 on: April 25, 2012, 03:59:13 PM »

Gawden Bennett, you lot do make things difficult...links for this, links for that, complex measurements here and there....just use a piece of silicone tube to join the two ends together with a drop of superglue to hold everything together.

And before there's comments about the tube won't hold together, I've used silicone tube as couplings on fast electric boats, subs, tugs, etc...you name it, silicone tube will join it and hold together.


Proper job...
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Rich

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~~~~~~~  "Motorflotes need love too...."  ~~~~~~~

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Re: Sheerline Trafalgar Class
« Reply #47 on: April 25, 2012, 04:43:04 PM »

Cheeky sod! Complex measurements indeed.

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Re: Sheerline Trafalgar Class
« Reply #48 on: April 25, 2012, 05:01:28 PM »

Language, Timothy...   ;D
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Rich

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Re: Sheerline Trafalgar Class
« Reply #49 on: April 25, 2012, 07:41:57 PM »

well reading  that gave me a laugh anyway. I don't know what is wrong with British company's they all say they need money to keep the company going 4 company's that I  contacted today reference couplings 2 said I would have to spend more than 20 to use my maestro card ??? the other 2 said they don't take maestro ffs what is this contry coming to when they can turn money down no wonder we are again in recession.................. Rant over

thanks Batfish but I have already destroyed one of them. So I did some Complex measuring which was difficult with the piece of string I use ready to pass over to Rich,when the wife said for FGS redesign the tekrak to incorporate a big red HUco coupling so .................. thats what I did all back together now with 3 Huco couplong one inside the WTC and 2 outside. Just got to wait for the sealant to go off and some nice British weather

Thanks guys for all the offers of help and all the help on here

Regards Mark
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