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Author Topic: Looking to build my own Riva style boats  (Read 2488 times)

tonyH

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Re: Looking to build my own Riva style boats
« Reply #50 on: August 29, 2021, 04:42:34 pm »

No, not cowardly atall. Just thinking about weightwatchers! :-))
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old man

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Re: Looking to build my own Riva style boats
« Reply #51 on: August 29, 2021, 04:59:32 pm »

Considering bare boat weight of 5lbs 9.6v probably best all round?
 O0 ?


om
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tonyH

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Re: Looking to build my own Riva style boats
« Reply #52 on: August 29, 2021, 07:24:58 pm »

 :-))
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old man

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Re: Looking to build my own Riva style boats
« Reply #53 on: September 10, 2021, 06:51:45 pm »

More information needed please.
Most things bought now so need advice on how to avoid smoke, grinding and wallet stresses?
I have:
FlySky Tx and RX.
Aquanaut Retro Outboard (800W water cooled)
80A water cooled ESC BEC.
9.6V NiMh 5000W racing pack Tamiya
HiTec servo
Tamiya connectors.
Wiring plan from here.


Need advice please regarding suitable fuse ratings and fitments for fitting to + on battery and + ESC to motor? No doubt will require more wire. Plan to layout prior installing.


All comments gratefully received, thank you.  O0


om
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tonyH

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Re: Looking to build my own Riva style boats
« Reply #54 on: September 10, 2021, 08:24:50 pm »

Hi om,
Others better qualified can advise on connectors etc because there are plenty of options but I'd certainly suggest you get something like this https://hobbyking.com/en_us/turnigy-180a-watt-meter-and-power-analyzer.html?queryID=26638358d7dbd7dc97a1e23bed0726a1&objectID=42854&indexName=hbk_live_products_analytics There are plenty around down to less than a tenner but it means that you know what current you're using so you can decide on a fuse.
Cheers
Tony
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malcolmfrary

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Re: Looking to build my own Riva style boats
« Reply #55 on: September 11, 2021, 09:26:28 am »

From the shopping list, ditch the Tamiya connectors, replace with XT60 or similar.
The 8 cell 5AH (5000mAH) NiMH pack should be fine.
Before considering a fuse, you do need to know what current to expect to draw.  There soon comes a point in any battery operated system when, with higher currents, the size and weight of the appropriate theoretical fuse and its mount outweighs its usefulness.  Normal Tamiya connectors are a very effective fuse, but often, not when one is wanted.
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Taranis

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Re: Looking to build my own Riva style boats
« Reply #56 on: September 11, 2021, 10:27:24 am »

Auto fuses are very cheap so an alternative method is to start small and work up 5amp at a time until it doesn't blow.
You don't even need a fuse holder, you can use a female spade connector on each blade.


An example where I recently fitted a 3 amp fuse to my bilge pump. You can go as high as 40amp in standard size auto fuses.
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old man

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Re: Looking to build my own Riva style boats
« Reply #57 on: September 11, 2021, 01:25:20 pm »

Thanks so far guys.


om
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old man

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Re: Looking to build my own Riva style boats
« Reply #58 on: September 17, 2021, 05:54:43 pm »


Oops!
Not a good moment, maybe don't try this build on your slipway? Inexperience may have caused an about turn on drive method?


The Retro outboard will not fit the transom rake or sit in the vertical position required for the cavitation plate to site correctly, additionally the steering eyes fall below the transom top? Needs a major GRP remodel to rectify?


Taking it to club Monday for confirmation from the scratch builders that it's a no go?
Could be Outboard and ESC for sale, reverting to original Z drive idea or maybe the whole lot to go and buy one ready to run?


Oh, what fun? {-)



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tonyH

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Re: Looking to build my own Riva style boats
« Reply #59 on: September 17, 2021, 07:06:57 pm »

Can't you just sandwich the transom between a couple of wedge shaped plates. Looking at the pics of a bellazza you could size them to lift the motor enough and also change the attitude?

Never give in at least until you've sunk it!
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ChrisF

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Re: Looking to build my own Riva style boats
« Reply #60 on: September 17, 2021, 09:12:23 pm »

Even with a Z drive the transom needs to be vertical. I've no experience of modifying GRP and plastic hulls but doubt it is easy. I suppose you can glue Plasticard in place and fill?

The outboard can't be raised too much as the prop won't be in the correct position. To accommodate the steering the transom often has a cut out in it.

Chris
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old man

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Re: Looking to build my own Riva style boats
« Reply #61 on: September 18, 2021, 08:08:51 am »

Thanks guys. Had a eureka moment this morning at 05.50. Pretty sure I am wrong. It should fit.
I need to stop fiddling when tired. I was trying to mount cavitation plate mentally at the keel level not the actual waterlevel noted from buoyancy test.
Lots to learn. Phew.
Om
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ChrisF

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Re: Looking to build my own Riva style boats
« Reply #62 on: September 18, 2021, 12:09:35 pm »

My understanding is that the cavitation plate needs to be just skimming the water surface when the boat is on the plane so in fact it will be down at the bottom of the boat and not at the waterline when the boat is stationary. Also needed there to give the prop a decent flow of water.


On my Huntress I'm fitting the Z-drive (same principle) with the cavitation plate just above the bottom of the hull and the majority of the prop below it.

Chris
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old man

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Re: Looking to build my own Riva style boats
« Reply #63 on: September 18, 2021, 12:54:54 pm »

Thanks Chris, If that is the case, not doubting you, that goes to my thought of the motor not fitting the hull without a stand off to allow the outboard to turn and position to drop more then can be accommodated without major modification.
No Z drives available anyhow.
I am back to looking on the tube as my memory of the video of my hull seemed to receive an outboard easily? will have to track down the one used but think it was slightly smaller than the Retro I have?
om
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old man

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Re: Looking to build my own Riva style boats
« Reply #64 on: September 21, 2021, 06:07:17 pm »

Found the Outboard twinned with the hull (Krick S85 flex) but unable to compare actual dimensions needed from data on line. Seems slimmer and taller. After consulting with a real modeller decided to make a jack plate allowing the motor to step off the transom and give some height adjustment to allow trial runs without butchering the boat too much, it may just plane fine?......Will see?

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ChrisF

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Re: Looking to build my own Riva style boats
« Reply #65 on: September 23, 2021, 11:16:55 am »

I was looking at building a boat with an outboard on but it is difficult to find one of a suitable size and more importantly height. One's like the one you have are more suitable for race boats with shallow transoms.

Ones that are more suitable are the old ones but they go for crazy money now and are a bit big as I build at 1:12. I did find a cheap plastic one which might do the job - it is only low power but as it's a small river cruiser it might be Ok. Needs modifying as well though for RC steering.

I've started doing the drawings for the model (haven't done anything for awhile though) and am working on it being an inboard now.

Chris
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old man

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Re: Looking to build my own Riva style boats
« Reply #66 on: September 23, 2021, 01:31:27 pm »

Thanks Chris, agreed about my outboard choice, still learning that too much research is impossible and that model shops can't know compatibility of all products they sell?
Scale of mine 1/10 so will see how it goes, not sinking will be a good start. :}  Have planned a recovery float and line.


Uwe Bauer from Bauer Modelle in Germany was very, very helpful, unfortunately for me after my purchase. {-)
om



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