Dumas Short Stuff Deep Vee Electric Conversion

[Les Albin]

I have two old Dumas Short Stuff 18"Deep Vee boats that were built for .049 nitro motors. Would like to convert them to electric. Looking for advice on motors and props.

[Alfa Spirit]

18" or 45,7 cm is a small hull, 2S battery and 7400 kV motor or 3S battery wih a 3100 kV motor.

[Fluid]

A terrible recommendation. 7400 KV motor is far too high for 2S, something around 2500-3000 would be much better. The ShortStuff was not designed for high speeds, 20 mph is probably as fast as it will like to go. At least the fiberglass one I had was almost uncontrollable at speeds we consider normal today for small boats.



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[Les Albin]

A terrible recommendation. 7400 KV motor is far too high for 2S, something around 2500-3000 would be much better. The ShortStuff was not designed for high speeds, 20 mph is probably as fast as it will like to go. At least the fiberglass one I had was almost uncontrollable at speeds we consider normal today for small boats.



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Thanks for the input. Looks like 2500-3000kv will be easier to find. Speeds around 20mph should be plenty for the places I'll be running. I'm guessing 7.4v will provide about the same rpm as my TD.049 which was plenty fast enough, but noisy and messy. Nice to have speed control with electric. The TD ran flat out all the time.

[Alfa Spirit]

Ok... This is a balsa boat kit not made for fast speed, I thought it was a modern fibreglass hull ...

[1coopgt]

I have two old Dumas Short Stuff 18"Deep Vee boats that were built for .049 nitro motors. Would like to convert them to electric. Looking for advice on motors and props.

Oh wow this brings back memories. This is the first boat I built when I was 15. Talk about a long time ago. LOL

[RaceMechaniX]

You could consider a 22xx outrunner motor. All e RC has some discounted Scorpion motors like this 2600kv 2208 outrunner.
https://www.allerc.com/scorpion-hkii...4-p-10758.html

We run one of these in a mini rigger on higher cell counts, but for a small 18" mono on 2 cells it should be a good fit. on 2S you will not need to water cool the motor and you can use a simple 25A speed control. If you run everything exposed look at the Castle Mamba Micro 2 ESC which is potted so it's waterproof. https://www.castlecreations.com/en/m...sc-010-0169-00

Find an appropriate Octura 1/8" coupler to the correct flex shaft or wire drive diameter and run something in the 25-40mm prop range.

[Les Albin]

You could consider a 22xx outrunner motor. All e RC has some discounted Scorpion motors like this 2600kv 2208 outrunner.
https://www.allerc.com/scorpion-hkii...4-p-10758.html

We run one of these in a mini rigger on higher cell counts, but for a small 18" mono on 2 cells it should be a good fit. on 2S you will not need to water cool the motor and you can use a simple 25A speed control. If you run everything exposed look at the Castle Mamba Micro 2 ESC which is potted so it's waterproof. https://www.castlecreations.com/en/m...sc-010-0169-00

Find an appropriate Octura 1/8" coupler to the correct flex shaft or wire drive diameter and run something in the 25-40mm prop range.

Thanks for the help. Probably should have waited a bit longer before purchasing things, but I went ahead with purchase of a 2800kv 2845 inrunner with a 28mm cooling jacket. Now need a motor mount and perhaps a prop. I have the two blade nylon props that Dumas sells for the .049 and .09 engines which will probably work. The boats have the original Dumas hardware which I think will be OK with an adapter to connect the motor to the existing propeller shaft.

The boats are from the original wood kits so they are pretty heavy compared to the newer fiberglass hulls.