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Page under construction:
This will be the buildup of a Dumas 55" Scarab deep V with a Zenoah G260PUM engine and surface drive along with my
brother's 47" deep V with the same engine. Much more to come.
I started with a blank hull that I fiberglassed in the engine rails at 5" spacing which is industry standard. I started
with the idea of using an 18cc weedeater engine from a Wal-mart weed wacker that came with my house. I started cutting away
the plastic housing to streamline the install. After starting the engine, it overheated and seized. Turns out the plastic
housing routes cooling air to the head...opps.
| Engine Rails |
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| Featherlite engine |
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After much research, mostly on http://www.modelgasboats.com
and Jims RC boat dock http://home.austin.rr.com/jnissen/rcboat.html
I settled on the Zenoah G260PUM water cooled engine. It's good for 4.2HP with a tuned pipe. Pricy at $325 though.
| Zenoah G260PUM |
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Next was to fiberglass the stuffing box which is a brass tube going out the transom. A 1/4" flex shaft from a weed eater
acts at the drive shaft. It's a direct drive to the Ballantine surface drive with a Prather 275 bronze alloy prop which has
been sharpened, balanced, and polished.
Here's a picture after the stuffing tube glassed in place, hardware and engine mounted, fuel cell made from 500mL IV bag,
waterproof radio box with 1/4 scale steering servo, throttle servo with kill switch, huge sub-C size Nicad receiver batteries,
and as many pool noodles that I jam in place.
Also note water injected tuned pipe exhaust. I made the header from a 3/4" copper elbow.
A couple days playing with masking tape and NAPA 2-part auto paint and the paintjob is complete!
It looks easy, but took 6 months of tinkering to get it to this point. It runs 42 MPH on GPS.
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