110" TIMBER Assembly Thread

[SjtStriker]

Had my first ground run today!! Can’t wait to fly it... handstarted very easily so don’t think I’m making a lot of fuzz about the spinner..

Maiden next week, I hope

 

[AKNick]

Had my first ground run today!! Can’t wait to fly it... handstarted very easily so don’t think I’m making a lot of fuzz about the spinner..

Maiden next week, I hope

Awesome!!!

 

[SjtStriker]

By the way.. now that I got it "swinging"..

--Is it possible/recommendable to swing a 21x8 or even 20" propeller on a 56cc motor?

 

[BalsaDust]

By the way.. now that I got it "swinging"..

--Is it possible/recommendable to swing a 21x8 or even 20" propeller on a 56cc motor?

I spun a 23x8 on my 55cc planes no problem.

 

[SjtStriker]

I spun a 23x8 on my 55cc planes no problem.

Hi, thinking ground clearance, so like to have as small diameter prop as practically possible... (and not "just" make noice and airplane not moving..)

 

[AKNick]

I think the warbird guys use a 22x10 on a 55cc. You could venture into a three bladed prop.... it would loose some power, but you have excess.
A 21x9 would be too small.

 

[SjtStriker]

I think the warbird guys use a 22x10 on a 55cc. You could venture into a three bladed prop.... it would loose some power, but you have excess.
A 21x9 would be too small.

Maybe this is a little on the crazy side, but I am tempted to give these a shot... 20x14 seems to be nice to go STOL, but 21x10 may be an conservative start?

(FYI: I'll use a 2-blade 22X8 while getting used to the aircraft... this is the recommended break-in propeller as well.)

 

[Wild man]

What I have found when switching form a 2 blade to a three bladed prop, to achieve some where close to the same in rpm and torq, go down one in pitch and one in diameter

 

[SjtStriker]

Wild man,
Good point, seems like all 3-blade props got a pitch at -10 or -12? if I spin a 22x8 now, the logic choose would be 21x7 right or am I mistaken here?

 

[Wild man]

When I was messing with props for my EME 60 cc I ended up changing from a 22x10 to a 12x8 three blade You can equate diameter as torque and pitch as speed you are right. Every pilot likes different values when choosing props. When doing 3D I do not use the same prop as in doing precision aerobatics, or racing