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Post  Coxfledgling Tue Nov 22, 2022 3:24 pm

Sosam, sir, I am hopeing you can advise...

I have an Enya 15 TV marine engine having a deflector type piston, so loop scavenge.

I have a wooden boat 32 inch long by 25 cm wide, semi planing hull, that will accommodate a 40mm propeller.

I know this may be difficult, but what pitch of prop would you recommend please.

Would going down in prop diameter help ( probably would I think ) but what pitch would you suggest please ?

Thanks in advance, rich.
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Post  sosam117 Wed Nov 23, 2022 8:48 am

Coxfledgling wrote:Sosam, sir, I am hopeing you can advise...

I have an Enya 15 TV marine engine having a deflector type piston, so loop scavenge.

I have a wooden boat 32 inch long by 25 cm wide, semi planing hull, that will accommodate a 40mm propeller.

I know this may be difficult, but what pitch of prop would you recommend please.

Would going down in prop diameter help ( probably would I think ) but what pitch would you suggest please ?

Thanks in advance, rich.


Fledgling,
I emailed a friend of mine (Skip Horseman) that has done R/C boating (in many forms - racing, scale, sailing and even subs).

He replied back to me giving me the information:
Skip said, " A good rule of thumb for a general-purpose model boat prop is the pitch/dia. ratio of 1.4 gives good efficiency and speed for both submerged and surface drives."

He suggested for your boat -- starting off with a 3214/2 prop.
Which is a 32mm prop diameter with a pitch of 44.8mm on a 2-blade prop.
From there you can move up to a 4014/2 or a 3514/3 (3 blade)?

Here is my Kyosho Jet Stream GP-10 --- It has an OS-.10 glow engine.
The prop on that is 3014/2 (dia. 30mm / pitch 42 / 2 blade prop)
Boat dimensions: 900mm bow to stern - excluding out drive / 187mm beam width / 140mm keel to top deck.
ABS plastic hull.

Haven't run it in over ten years but did look it over this year and everything is still good as new.

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Post  Coxfledgling Wed Nov 23, 2022 9:28 am

Thanks sosam, thank skip for me as well. Will digest info later...lovely boat, and recoil start too. Centrifugal clutch ?

Different boat, Perkasa f/glass hull MTB type boat, need recoil start and centrifugal clutch, but may go IC/electric as reverse easier, electric means way tooo heavy for me, would need a crane to lift it.

Thanks again, rich
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Post  sosam117 Wed Nov 23, 2022 6:16 pm

Coxfledgling wrote:Thanks sosam, thank skip for me as well. Will digest info later...lovely boat, and recoil start too. Centrifugal clutch ?

Different boat, Perkasa f/glass hull MTB type boat, need recoil start and centrifugal clutch, but may go IC/electric as reverse easier, electric means way tooo heavy for me, would need a crane to lift it.

Thanks again, rich

Yes, I'll tell Skip.
Skip would build gorgeous boats. For me, I wouldn't race his boats they were that good looking.
Everything neat inside. Servo wires tied to the side of the hull with plastic keepers.
Fuel lines neat and has mini hose clamps on the tubing.

Skip hasn't done any hydro racing now for almost eight years. (Parkison's disease -- shaky hands)

He does most now sailboats and scale tugs and his gorgeous Kriss Craft boat that he has had for 20 years.
I like going out with Skip when he calls and just watch him tool around with his boats (he'll let me run one too)

I have asked him that one of these days I would like to acquire the Kriss Craft boat of his?

He was the one to beat in the area for hydro boats. Even his scale boat as well.
One boat would normally take him from end of September to middle of May to build.

And yes, Skip is his real 1st name and not a nickname.
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