Topic: Looking to build my own Riva style boats (Read 6069 times)

old man · « **on:** August 08, 2021, 10:07:10 am »

Following a recent poor experience with a model shop in pursuit of a Riva type launch for use when the wind doesn't blow, I am looking to build my own.
I particularly like the Riva style boats. This type of craft would fit in well with other members models, much better than a pre-built fast job. Fun and function?
I have neither the eyesight, time or inclination to build anything too complex so have found the Amati Bellezza and Riva type launches which could fit the bill as hulls and decking come assembled.
I am use FlySky radio kit but need advice on running gear etc. to enable a fairly nippy model that functions reliably?

Any or all comment thank you, even alternative kits, possible cooling issues, anything relevant please shout up.
Regards om

Colin Bishop · « **Reply #1 on:** August 08, 2021, 10:20:48 am »

Have you looked at the Dumas Chris Craft range?

https://www.cornwallmodelboats.co.uk/acatalog/Dumas-chris-craft.html

(there are other suppliers)

They seem to be very well regarded.

Colin

old man · « **Reply #2 on:** August 08, 2021, 10:43:58 am »

Thanks Colin, yes I have. They don't seem to float my boat hull shape or trim wise.

om

tonyH · « **Reply #3 on:** August 08, 2021, 11:08:29 am »

If you speak to Hobbies, they used to sell a complete Amati Riva pack with motors/esc/shafts etc etc which may be worth while.
They have it as out of stock at present BUT some time ago they had a slightly damaged kit for £100.00 which could still be there (They don't seem to get too many visitors!) Might be worth a call even to pick their brains as to the rest of the package?

For some strange reason the set appears on the Hobbies web site if you Google Amati models but won't copy onto here

old man · « **Reply #4 on:** August 08, 2021, 11:13:25 am »

Thanks Tony, a very useful contact.

om

tonyH · « **Reply #5 on:** August 08, 2021, 11:18:29 am »

Sorry OM, see the PS,
Tony

old man · « **Reply #6 on:** August 08, 2021, 11:21:40 am »

Got it, thanks.

om

tugboyben · « **Reply #7 on:** August 08, 2021, 11:41:20 am »

Hi Old man

Any good to you

https://www.ebay.co.uk/itm/154558344164?hash=item23fc652be4:g:n6gAAOSwMDphDAVJ

Jason

old man · « **Reply #8 on:** August 08, 2021, 12:15:48 pm »

Thanks Jason, now have a quandary?

om

tonyH · « **Reply #9 on:** August 08, 2021, 12:40:16 pm »

Pretty Good! 6 minutes ago! You've got great reactions for an old man!

old man · « **Reply #10 on:** August 08, 2021, 12:58:37 pm »

Mm, sometimes

?

om

old man · « **Reply #11 on:** August 08, 2021, 12:59:53 pm »

Still welcoming comment about engines, cooling etc?

om

tonyH · « **Reply #12 on:** August 08, 2021, 01:52:20 pm »

Have a look through the boats from Zooma, Chris, Madwelshman etc.on the Pleasure, etc section for the sort of options because it really does depend on what you're trying to achieve. I.e. scalish speed, out-and-out racer etc. Weight is going to help you decide on single or 2 screws anyway. Once you know that you can plan accordingly.

old man · « **Reply #13 on:** August 08, 2021, 03:51:21 pm »

Thank you.
Current thought around scale ish speed, resulting in reliability, more run time and fun than breakdowns.
Most likely NiMh, single prop, cooled?
Should take delivery early next week.

om

tonyH · « **Reply #14 on:** August 08, 2021, 06:45:26 pm »

Then when you've got it in your mitts, check how much weight it can carry by sticking it in the bath and loading it down to the waterline and then you'll know how much you've got to play with. Deduct a few percent to allow for odds and sods etc. and if you allow about 500gms for a decent size battery, about 150gms each for the motor and the ESC and probably the same again for the propshaft and prop. I've assumed brushless motor with Lipo battery because they're more efficient. Nimh batteries are slightly heavier and don't deliver as much power but since it's for leisure it should'nt matter too much. Bob (Zooma), Chris, Madwelshman etc. know a lot more than me and can recommend model numbers/sources etc. for the motor etc but I reckon the weight is the starting bit because you can then sort out the balance of the boat etc. I'm early in the powerboat learning curve myself and I've learnt a lot from the others so Good Luck

old man · « **Reply #15 on:** August 08, 2021, 08:13:27 pm »

Thank you again Tony.

Regards om

Martin (Admin) · « **Reply #16 on:** August 08, 2021, 09:27:29 pm »

Aeronaut Models:

https://aero-naut.de/product-category/schiffsmodelle/yachten/

https://www.cornwallmodelboats.co.uk/acatalog/aeronaut-p1.html

old man · « **Reply #17 on:** August 09, 2021, 08:41:39 am »

Thank you martin, lots to absorb and fun to be had.

Regards. om

old man · « **Reply #18 on:** August 15, 2021, 09:17:00 am »

The fun continues, seems like the Bellezza was designed for and outboard? Luckily for me a tip from tugboyben resulted in a good buy from ebay (thanks again) so no drama in having to bodge it a bit if needed.
Still trying to investigate propeller position etc.

tonyH · « **Reply #19 on:** August 15, 2021, 09:57:53 am »

If it was designed for an outboard then the prop and the rudder will be well behind the transom so bringing them forward would b****r up the driveability etc. Why not stick with the outboard theme? Pricier probably but a lot simpler! The boat seems to come under the Krick banner so the consruction vids are out there. This one covers the mechanics etc. https://www.youtube.com/watch?v=7P16lwfQDHU
Just an idea

Or, of course, you could use an internal motor and concoct an outdrive or a dummy outboard setup. Tricky but certainly doable

Decisions, Decisions........

old man · « **Reply #20 on:** August 15, 2021, 10:34:48 am »

Thanks Tony, I'm not considering outboard at present? as I saw a video of that set up and didn't like either the cost or perceived performance.
It seems likely so far to be a punt at an 850 brushed, 50A ESC, NiMh set up cobbled to fit. My criteria is just a quickish reliable fun model to use when no wind about. Not concerned with scale visuals if that makes sense. Quite willing to modify underwater profiles as needed and add deck fittings to cover access points to achieve this.
Should be fun as so much research needed to compensate for lack of modelling skill, eyesight and ability?

I really need to get a grip. Could imitate a long tail outboard if all else fails.

malcolmfrary · « **Reply #21 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.

Martin (Admin) · « **Reply #22 on:** August 15, 2021, 12:07:51 pm »

Great idea!

50p to first person to find the article.

tonyH · « **Reply #23 on:** August 15, 2021, 02:05:09 pm »

If it's gettable from Krick direct(ish), then this is cheap enough. It's a tad small (1:15) but with the 40+mm prop should be easy enough.

old man · « **Reply #24 on:** August 15, 2021, 05:02:44 pm »

Brain starting to ache now, should have stuck to chess?

Thanks for the ideas guys.

Seems like at Kricks the recommended outboard alone is 175 euro + everything else.
Don't think the 1/15 one would sparkle as bare boat weighs 5lbs.
Still digging the hole.

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Author Topic: Looking to build my own Riva style boats (Read 6069 times)