DESERT RATT

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I got this boat on trade quite a few years back. I understand it's an old Hydro. It came with a O&R gas engine but I'm switching to electric. Could someone help me with what Name, Brand etc it is. It's 42" long and 15-1/2 inch wide.
b Thanks in advance guys.

Hydro Junkie

It's not a hydro but it is an old design. It could be a "step" hull but to know that, I'd have to see the bottom of the boat

Tidnab

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Looks like the Octura White Heat V with a modified cowl. This kit was made to use the O&R either air cooled or water cooled engine.I used to have the air cooled version with the V8 stacks but but never built the boat and later sold the engine.

DESERT RATT

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nice looking boat. Yes, that's the engine i pulled out of it. after your tip on boat I.D. I am doing a couple of searches and found some great info.
Thanks for your time and help. Much appreciated!

Hydro Junkie

I posted your pictures in another forum to see what information we can get from others in the boating community. Maybe we'll get lucky. Hope you don't mind.
Leave it to Tidnab to post that while I was posting it elsewhere

DESERT RATT

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Yes, it has a step hull. 1"

DESERT RATT

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Thank you! Hydro Junkie.

Tidnab

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If you still have the engine and are going to get it running you can get info and maybe parts from this Facebook group. https://www.facebook.com/groups/2437561736518198
Also from the My Old Engine site. https://myoldmachine.com/forum/74-ohlsson-and-rice/
I've also found parts on Ebay.

Hydro Junkie

Your boat has really set the other site on a trip down "memory lane". It sounds like some are going to be doing a bit of research on it and have several places to go. From what I can tell, several agree with Mr Tidnab, some have even figured out what motor it is. Apparently, your boat was quite successful back in its day.

DESERT RATT

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I've thought about it. It's in pretty good shape. It turns over has compression and spark. the rubber Diaphragm in the carb is still soft and not torn. I've thought about selling it but have no idea what it may be worth nor where to post it.

DESERT RATT

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When you say the other site, Where's that at ?

Hydro Junkie

I'll tell you in a PM. Most sites don't like you to talk about another site in the threads, something to do with advertising or similar.

DESERT RATT

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How do I go about choosing a Motor for a boat. I fly planes and have knowledge of doing the math to put a motor where an engine was. A boat though seems as if it may be different with added drag.This boat when completed and painted will range from high 7's to low 8lbs. I want what I consider a medium fast speed on our nearby lake. I have in mind something on the 600kv to 530kv. Running two 4s batteries to maybe 2 5s.. I would like to see maybe 40-45 MPH on a smooth morning.
From your all's experience's where should a start? also prop sizing? and how about balancing

DESERT RATT

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Thanks for your input Tidnab!

Hydro Junkie

Electrics are something I don't know that much about. You might try contacting Offshore Electrics, tell them what you have for a boat, along with its weight and tell them what electronics you already have. They should be able to point you in the right direction.
With that said, the guys that race 1/8 scale electric scale hydroplanes run 8S packs and 830-860 KV motors. You have to remember, you're pushing more weight through a denser medium and spinning higher RPM so it's going to take more power in both the batteries and motors to get the results you want
Offshore Electrics address is at this link: RC Boats by Offshore Electrics

DESERT RATT

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The density is exactly what I'm referring to. Big difference Between water and air. Once again thanks for your input. I will do as you recommend.

Tidnab

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Here's a small thread that gives motor info. https://forums.offshoreelectrics.com...gle-step-hydro

If you decide the electric route is too expensive there's a thread on some forum that a guy put a Zenoah 26 PUM in his White Heat.

DESERT RATT

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Thank you once more the cost isn't an issue but the run times are. I need to think about this. I may put the O&R 1 hp back in after a freshen. I think I'll finish the boat up then go from there.
Thanks very much for your input it is much appreciated

Tidnab

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If you need parts for it try the places I put in post #10 will help you.