Vintage Dumas Hotshot Sprint resto

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coxbros1
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Re: Vintage Dumas Hotshot Sprint resto

Post by coxbros1 »

Marty, the prop fixed the boat, got it running pretty good.
It porpoises but other than that is fine
Tap pic for clarity: Derek

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Re: Vintage Dumas Hotshot Sprint resto

Post by marty slater »

CG center of gravity 28 to 30 percent from the rear of boat
also play with prop height
set you boat on the kitchen table split the table like you are trying to put a leaf in it.
set it on the small split so the motor is hanging in the split.
no prop on it the prop shaft should be around 1/8 to 3/16 of an inch above the table top
or above the sponson bottoms
marty

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Re: Vintage Dumas Hotshot Sprint resto

Post by coxbros1 »

Will do, thanks
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Re: Vintage Dumas Hotshot Sprint resto

Post by Coelacanth »

marty slater wrote: Thu Mar 26, 2020 1:57 am CG center of gravity 28 to 30 percent from the rear of boat
Thanks Marty, I read that somewhere on the RCGroups forum where there's a FeiLun FT012 thread, but forgot the exact center of gravity front-to-rear ratio. It's good to know as I did a lot of modding to my FT012 and I need to check my boat's CG before the maiden voyage.
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Re: Vintage Dumas Hotshot Sprint resto

Post by coxbros1 »

How do u tell if your 28 to 30% CG from the rear?
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Re: Vintage Dumas Hotshot Sprint resto

Post by marty slater »

lets say the boat is 30 in long 30 x .28 = 8.4 in from the rear of sponson or 30 x .30 =9 in from rear of sponson
take a small dowel rod lay it under sponsons an roll it back an forth to find balance point
marty

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