ORIGINAL: jharkin
ORIGINAL: jumpinjan
ORIGINAL: Horsepoweraviation Probably my DA150 with a prop extension
The DA150 is only 16.5hp. The full size DH2 had a 100hp Gnome engine. Even a rough power estimate (100hp * 50%) would be 50hp....You're not even close. And probably need more than 50 because of lower Coeff of lift of a scale airfoil.
Also, watch out for prop extensions. They can introduce a lot of torsional problems.
The math of scaling power doesn't work that way. At 1/2 scale, the wing area is 1/4 and the cubic volume of the structure is 1/8th. That plus the lighter materials we use his model will probably weigh less than 10% of the full scale, and have a resulting much lower wing loading.
Look at it another way: If a half scale needed 50hp then by that logic a 1/4 scale would need 25hp... yet most 1/4 WWI jobs fly on a G26 or G38 ish power level just fine.
I bet the DA150 will be more than enough.
You are correct. This DA 150 pulled around a 97LB DR 1 Fokker Tri-plane ....sooooo a 60-65 bi-plane will be noooo problem!
