I got my Gas Scale in the water this Sunday.A little background on the boat then my main problem ,I think.
Bud T-6
Wood hull
CAD program by ML boat
Lazer cutting by Kevin Visconti
Framing mods by me
Epoxy cowl and rear wing by Jeff Snell
RCMKRZ modified by GIsmo
2"flat band aluminum pipe from Gismo.Set at 12" from engine flange to center of flat band.
Radio box in bow,hard plastic 16oz. fuel tank behind engine.
Rear of drive dog at rear of transom
Dry weight 21#.I coated the wood parts inside and out with 2 coats of West Systems epoxy slightly diluted with alcohol then scraped down with a credit card.I scaped the exterior with a razor blade after building.This is how I am now running the boat until I hope to get it dialed in,then paint.
Props tested:
6717/3, 3.95 pitch.Motor won't pull load at 1 1/2" strut depth.At 1 1/8" strut depth boat will not get on plane.
6518/3,5.0 pitch.Trouble getting on plane,drags tail.Speed slightly slower than 1/8 scale
6518/3,4.2 pitch.gets on plane easier and about same speed as the 5.0 pitch,tail drags
CG is about 2" rear of the front sponsons.No extra weights
After the first runs the strut was raised between 1 1/4" and 1"
I think my main problem is the extra drag from the rear.Of course the high weight does not help either,but I can not change that.
The rear ride pads and the rear of the canoes are very close to scale.I knew the boat would have a rear weight problem, and I made the bottom of the ride pads 3/32" below the bottom of the afterplane.At this time I have not included the mini steps on the ride pad bottoms.
The consenses of our local guys is not to add weight to the nose of an already heavy boat,but to possibly increase the depth of the ride pads and work on the prop and strut.
Do any of you out there have experience with mini steps or have suggestions on props,cg,strut ,and any other ideas?
Remember this is Gas Scale.Boat is 54 1/4" long and 28" wide.
Harvey Liberman
Knoxville, Tn.
Bud T-6
Wood hull
CAD program by ML boat
Lazer cutting by Kevin Visconti
Framing mods by me
Epoxy cowl and rear wing by Jeff Snell
RCMKRZ modified by GIsmo
2"flat band aluminum pipe from Gismo.Set at 12" from engine flange to center of flat band.
Radio box in bow,hard plastic 16oz. fuel tank behind engine.
Rear of drive dog at rear of transom
Dry weight 21#.I coated the wood parts inside and out with 2 coats of West Systems epoxy slightly diluted with alcohol then scraped down with a credit card.I scaped the exterior with a razor blade after building.This is how I am now running the boat until I hope to get it dialed in,then paint.
Props tested:
6717/3, 3.95 pitch.Motor won't pull load at 1 1/2" strut depth.At 1 1/8" strut depth boat will not get on plane.
6518/3,5.0 pitch.Trouble getting on plane,drags tail.Speed slightly slower than 1/8 scale
6518/3,4.2 pitch.gets on plane easier and about same speed as the 5.0 pitch,tail drags
CG is about 2" rear of the front sponsons.No extra weights
After the first runs the strut was raised between 1 1/4" and 1"
I think my main problem is the extra drag from the rear.Of course the high weight does not help either,but I can not change that.
The rear ride pads and the rear of the canoes are very close to scale.I knew the boat would have a rear weight problem, and I made the bottom of the ride pads 3/32" below the bottom of the afterplane.At this time I have not included the mini steps on the ride pad bottoms.
The consenses of our local guys is not to add weight to the nose of an already heavy boat,but to possibly increase the depth of the ride pads and work on the prop and strut.
Do any of you out there have experience with mini steps or have suggestions on props,cg,strut ,and any other ideas?
Remember this is Gas Scale.Boat is 54 1/4" long and 28" wide.
Harvey Liberman
Knoxville, Tn.