Topic: Looking to build my own Riva style boats (Read 6070 times)

tonyH · « **Reply #25 on:** August 15, 2021, 05:19:45 pm »

Forget the Krick outboard, but the sterndrive is a compromise at about £15.00 and then you have whatever motor/esc you want inside the hull.

old man · « **Reply #26 on:** August 15, 2021, 05:36:33 pm »

Thanks Tony, could be a brilliant solution.
Looking now.

tonyH · « **Reply #27 on:** August 15, 2021, 08:48:22 pm »

Hi om,
Sorry, I am probably leading you up the garden path judging by the weight factor. I've looked at the sort of things that are on line with the Krick/Robbe sterndrive fitted and they all seem to be in the 3-4 lb all-up weight. If you have a look at this one, and the notes from the builder, you'll see what can be got and adjust brain accordingly. https://www.youtube.com/watch?v=mc57_rDts2QLarger ones, of course, are available BUT starting at about £90.00 which, defeats the object!

old man · « **Reply #28 on:** August 15, 2021, 09:13:20 pm »

Thanks again Tony, not necessarily a defeat yet?

Maybe twin z's or a £90 as it solves the problem of getting the prop and rudder behind the transom?

Still working on it, no sweat as the kit was cheap second hand, giving room to move.

tonyH · « **Reply #29 on:** August 16, 2021, 09:38:43 am »

This is the £90 one. There's another recent thread about getting stuff from Germany and Bauer are mentioned.The product info sheet is worth looking at. https://www.bauer-modelle.com/epages/Bauer_Uwe46269592.sf/en_GB/?ObjectID=68185802

Tug Fanatic · « **Reply #30 on:** August 16, 2021, 11:28:54 am »

Quote from: malcolmfrary on August 15, 2021, 12:00:30 pm

A trick that was mentioned a lot of years ago to achieve an outboard look (free magazine plan for a mini racer, mid-90's) was to mount the steering servo on top of the transom by its horn, and attach the rudder to the (inverted) servo body. The motor/ prop layout was a fairly standard inboard motor, but with the prop beyond the transom. One of my club members did a RIB lifeboat that way, it worked very well and, when exhibited caused lots of questions about the availability of his "outboard". Dressing the servo up to look like an outboard enhanced the illusion.

I don't know the article/ boat mentioned above but this is a similar idea but not having the servo in the head. The motor construction starts around post 25:

https://www.rcgroups.com/forums/showthread.php?1710137-1-10th-Scale-Caballero-%28Mechanix-Illustrated%29&perpage=50#post22446190z

Whether this is easier than disguising a servo as a motor is up for debate

old man · « **Reply #31 on:** August 22, 2021, 12:01:53 pm »

Needing more illumination please concerning sustained brain fog.

Nearly definite on use of twin z drives which are rated to 15000 rpm and rigid prop shafts maintenance free rated to 13000 rpm. Question please any benefit/disadvantage with using flexible shafts, assuming such beasts exist in the correct sizes?
Also the benefit/need for flexible mounts to motors such as twin Outlander thumpers 2836/08?

Thanks in anticipation again, still trying to win?

chas · « **Reply #32 on:** August 22, 2021, 12:16:28 pm »

Flexible shafts are great in a racing boat, not very practical in other types. You can't reverse, and they nead regular maintenance. They wouldn't be my choice.
Chas

old man · « **Reply #33 on:** August 22, 2021, 12:27:02 pm »

Thanks chas.

om

ChrisF · « **Reply #34 on:** August 23, 2021, 12:31:10 pm »

Be interesting to see how you get on with installing the stern-drive(s).

I'm using one in my Huntress build (same as in Tony's link) which is an interesting challenge - good to do something new. With this stern-drive you don't need a prop shaft or flexible shaft as the motor bolts straight onto the drive and connects via a small flexible shaft inside.

I haven't done anything for a couple of months though as it's mainly a winter hobby for me apart from running them.

Chris

old man · « **Reply #35 on:** August 23, 2021, 04:30:20 pm »

Thanks Chris, I didn't realise no shafts needed, will investigate that.
Regards

om

ChrisF · « **Reply #36 on:** August 23, 2021, 04:50:05 pm »

Hi - when I'm back home a little later I'll post up a couple of pictures.

The drive cost me about £100 including 2 props and postage then you need to add a motor, I've got an Overlander of similar spec. to that recommended. Bit more expensive than a prop shaft and rudder but not too bad. I did think about two in the Huntress but mine's a smaller model at 23" and it's a bit tight in the hull.

Chris

ChrisF · « **Reply #37 on:** August 23, 2021, 07:30:19 pm »

Few piccies. As the part that bolts onto the transom is quite bulky for my 1:12 scale build I've set the stern-drive into a recess.

As I said before the motor bolts onto the stern-drive. Installing the system for steering is a little bit fiddly - I'm using twin snakes (will be longer than shown) that run forward, past the battery and into the cockpit area where the servo will sit. More work to be done on that though and is where I left it.

Martin (Admin) · « **Reply #38 on:** August 23, 2021, 07:53:31 pm »

Topic renamed - Admin

old man · « **Reply #39 on:** August 23, 2021, 08:12:42 pm »

Thanks again Chris, a brilliant illustration giving me lots to consider.

Thanks Martin, if only the rename cleared some mist away.

om

ChrisF · « **Reply #40 on:** August 23, 2021, 09:37:44 pm »

Whilst not in the same class, by some margin (!), the photo a few posts back reminded me of one of our family's earliest power boats and whilst going through old photos at my mothers the other day I was lucky enough to find a picture of it.

My recollection is vague as we are talking about 60 years ago, but I remember my father converting it into a family runabout. And I seem to remember being told it was some sort of remote control boat and had no seats in it. I definitely remember him cutting through the deck to form the seating areas. The boat was approx. 17 feet long.

Sorry about the quality but I took a photo of a very small B&W photo.

Chris

ChrisF · « **Reply #41 on:** August 23, 2021, 09:56:08 pm »

Thinking more about it I seem to remember it being used for target practise and have found a picture of a boat with a very similar hull being towed/controlled and having a target mounted on it.

End of thread hijack!

Chris

Circlip · « **Reply #42 on:** August 24, 2021, 08:22:46 am »

I seem to remember it being used for target practise

Sounds like the Queen Gull Ford E93a side valve engine powered. Muddle boats did an updated version of the original Muddle Maker Queen Gull plan.
Regards Ian.

ChrisF · « **Reply #43 on:** August 24, 2021, 02:20:48 pm »

Thanks for the info. Ian, glad someone has heard of them. Here's the picture I mentioned, can find nothing else. Might be bigger than the one we had though, difficult to judge. Tow boat is HMAFV Wellington.

Apologies OM.

Chris

Netleyned · « **Reply #44 on:** August 24, 2021, 02:28:38 pm »

They were 13ft 6ins long
and could be "distance controlled"

ChrisF · « **Reply #45 on:** August 24, 2021, 02:32:00 pm »

Thanks N. Found some more info. following Ian's lead. Smaller than I thought.

old man · « **Reply #46 on:** August 28, 2021, 10:44:45 am »

Well, at a stop for a while now.
Having unsuccessfully managed to source said z drives in the UK I contacted Krick in Germany, looked all good from a stock point of view so filled out my order, clicked to complete, Oops no postage destination in UK. We have been removed from their list post Brexit due to tax and other complications. Emailed a very helpful customer services to be given their UK agent details, no answer on the phone so email sent......Zzzzzzz?
Tried stockists in other EU countries to no avail even for suitable outboards, There may be a cheap boat on the ebay soon?

Only joking.

old man · « **Reply #47 on:** August 29, 2021, 11:04:57 am »

Finally a moment of clarity? ? ?
Have decided to go outboard with an Aeronaut Retro. Found UK stock, motor and cooling fitted, no holes below the waterline. What's not to like.
Thanks for all of your help and replies.

om

tonyH · « **Reply #48 on:** August 29, 2021, 12:24:42 pm »

Very Nice OM,
Are you going to run it on the full 14v (4S) Lipo? Could be very interesting!

old man · « **Reply #49 on:** August 29, 2021, 12:38:59 pm »

Nooooo Tony, trying to avoid Lipo, thinking cowardly NiMh?
Lipo maybe a bit too unstable for me knowing my propensity for getting smoke and grinding so easily?
Thinking 8.4v 3000A initially, comment welcome as looking for easy use and few breakdowns. 9.6 v 5000 an option?

om

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Author Topic: Looking to build my own Riva style boats (Read 6070 times)