Workhorse
Well-Known Member
I’ve been thinking if the engine I have could propel a downsized b-29. I mean, we have a 35 hp 4st direct driving a 48” propeller giving about 110 Kg (242lbs) static trhust I guess.
Let’s have an airframe with 6.8m (22.3ft) wingspan. 43 sqft (4sqm) wing area. Aspect ratio 11.35. MTOW 250 Kg ( 551lbs) giving a wing loading of 12.8 lbsqft (63kgm2). Empty weight is 100 Kg, 220lbs (engine itself 101 lbs, 46 Kgs). Pilot and parachute another 220 lbs. 68 l or 18 gal of fuel . Fuel burning from 8-10 l/h, 2.1-2.6 gph.
Let’s again imagine a stratocruiser airframe we can fit in. Remove engines and fit the one I have in a blunt nose alike a bearcat. Put a RV3 canopy, and an underseat full of bead foam. The stratocruiser airfame would give you about 18” in the waist, 29” tall without canopy, 25”wide and still a cushion of 12” under the seat between spars.http://39th.org/39TH/images/cutaway/cutaway.gif. Karman fairings blending wing root and fuselage. Single wheel retract.
We can see the root airfoil http://www.ae.illinois.edu/m-selig/ads/afplots/b29root.gif give us room enough for intended fuel.
My question is if I could build a composite airframe weighting 120 lbs. If I could have fowler flaps, wich would be the take off run, stall and cruise speed?. With given tip airfoil http://www.ae.illinois.edu/m-selig/ads/afplots/b29tip.gif would we need wing washout?.
For trim there would be an adjustable angle of incidence device for the fixed part of the horizontal stabilizer.
Thanks for watching.
Let’s have an airframe with 6.8m (22.3ft) wingspan. 43 sqft (4sqm) wing area. Aspect ratio 11.35. MTOW 250 Kg ( 551lbs) giving a wing loading of 12.8 lbsqft (63kgm2). Empty weight is 100 Kg, 220lbs (engine itself 101 lbs, 46 Kgs). Pilot and parachute another 220 lbs. 68 l or 18 gal of fuel . Fuel burning from 8-10 l/h, 2.1-2.6 gph.
Let’s again imagine a stratocruiser airframe we can fit in. Remove engines and fit the one I have in a blunt nose alike a bearcat. Put a RV3 canopy, and an underseat full of bead foam. The stratocruiser airfame would give you about 18” in the waist, 29” tall without canopy, 25”wide and still a cushion of 12” under the seat between spars.http://39th.org/39TH/images/cutaway/cutaway.gif. Karman fairings blending wing root and fuselage. Single wheel retract.
We can see the root airfoil http://www.ae.illinois.edu/m-selig/ads/afplots/b29root.gif give us room enough for intended fuel.
My question is if I could build a composite airframe weighting 120 lbs. If I could have fowler flaps, wich would be the take off run, stall and cruise speed?. With given tip airfoil http://www.ae.illinois.edu/m-selig/ads/afplots/b29tip.gif would we need wing washout?.
For trim there would be an adjustable angle of incidence device for the fixed part of the horizontal stabilizer.
Thanks for watching.
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