3 bladed props and ext.
 

hi i just bought a uesd avistar and resherch almoust every and it rcomended 10*5, 10*6, and 11*5 prop i am useing 11*5 but i wanted to know if 3 bladed props were an option and if anyone had suggestion on any other option for the avisar

RE: 3 bladed props and ext.
 

You CAN use one. Why do you want to? 2-blade props are more efficient, easier to find and cheaper. Do you feel you have a NEED for one?

RE: 3 bladed props and ext.
 

I agree with Bruce sort of. why a 3 blade? 2 blades are easier to get, so are spinners.
I am not buying the arugument that 2 blade props are more efficient

RE: 3 bladed props and ext.
 

It is not an argument that 2 blade props are more efficient - it is the laws of physics.

RE: 3 bladed props and ext.
 

3-blades are fine on full scale but lose something when downsized. In our sizes the 2-blade wins. Get up over 36 inch dia and I'd have to look at it again.

RE: 3 bladed props and ext.
 

i was woundering if it is roung or not good for the engine anymour suggestions

RE: 3 bladed props and ext.
 

Not wrong, and the engine won't suffer.

One reason to use a 3-blade prop is to cause the engine to work harder at a slower speed.

Seriously, when students are flying, it is good to have them fly slowly, so they have time to react and correct the flight direction, before the plane crashes. However, the engine isn't working very hard that at slow speeds, and the beginner might have the carburetor a little rich. That will prevent the engine from warming up to a proper temperature.

If the engine has to work harder, to drive a draggy 3-blade prop, it will run at the proper temperature even at slow speeds.

My opinion, for what it's worth. Good luck,
Dave Olson

RE: 3 bladed props and ext.
 

ok are spinners more expensive too

RE: 3 bladed props and ext.
 

not really,just a royal pain to find.

RE: 3 bladed props and ext.
 

and i am buddy boxing so speed and reacting shouldent be a proublem

RE: 3 bladed props and ext.
 

For YOU or your instructor?:D

RE: 3 bladed props and ext.
 

i am buddy boxing with an in structor and didnt i say i just started ?

RE: 3 bladed props and ext.
 

oh wait i read that roung hahaha

RE: 3 bladed props and ext.
 

roung is wrong

wrong is correct :D

RE: 3 bladed props and ext.
 

wow[&:]

RE: 3 bladed props and ext.
 

A 10x5 3-bladed prop would be fine on an Avistar. You could even try the Evolution TPS 3-bladed prop if you'd like, I believe it's a 10x4 3-blade and should be readily available in most hobby stores.

Less efficient is a good thing when you're not trying to run at top speed. I'm running an APC 11x4 2-blade on my Tower Trainer just to keep the power in check coming from my .46 FX. If I put an 11x7 on that engine, I'd bet that trainer could fly 80 mph.

RE: 3 bladed props and ext.
 

One thing that people forget to mention, is clearance. I saw someone flying a Nitro Cessna 337, and the size of the props made it difficult to taxi and for landings and takeoffs because of the tendancy for the prop on the rear engine to hit the ground. The front prop demonstrated the same problem. He considering 3-blades on both engines because they can be downsized by 1 inch. Some efficiency is lost, but the power will still be sufficient to make the craft do what's intended. I think a 3-blade would work well for an Avistar if a rough grass runway is used.

NorfolkSouthern

RE: 3 bladed props and ext.
 

runway is concret but my instructor says landing on grass to start with is butt let not get into that