3 Blade Prop on YS61 / Yes or No ?
 

I really like the look of the 3 blade Carbon Fiber props. Is that ok with a YS61FZ ?

70 in wing
60 in Fuse

What size also would you suggest.

Thanks Again...

RE: 3 Blade Prop on YS61 / Yes or No ?
 

Compromise and use the three blade prop for static display only.

At the rpms our engines operate, three blade props absorb extra horsepower without producing extra thrust. Most full size aircraft that use more than two propeller blades utilizing gear reduction units to slow down the rpm of the props, where they are more efficient.

Of course, if you try a three blade prop (a good idea just for the experience) and are satisfied with the results, who am I to argue?

RE: 3 Blade Prop on YS61 / Yes or No ?
 

Wrong on both counts. There is some lost efficiency, but there is extra thrust from the extra blade, but many engines will slow down too much to notice, unless the diameter or pitch is less. I know of no gear reduction specific to full sized props. I have a pilots license and except for turbo prop planes gear reduction is not used nor needed in a full sized plane. In full sized planes multi bladed props are used for two things, prop clearance when more prop area is needed, or high speed high altitude flight. The higher and faster you go the high speed smaller column thrust is what you need. A jet engine being the ideal.

In pattern three bladed props are used for two things, prop clearance when a taller gear is not possible, or just looks stupid. And to get below the strigent noise rule that pattern competition has. I would not bother with a three blade prop unless you have one of those problems.

RE: 3 Blade Prop on YS61 / Yes or No ?
 

Thanks Ed & Sport for the info. I appreciate your time greatly and must say that im really looking forward to this hobby. Im so impressed at the time this guy took to build this plane and make it look so beautiful as the final result. That shows alot of pride and talent and i ( Look Forward ) to showing it off at the local flying club here in Orange County .

Since i have 2 props that are 2 blades with the motor already, i will stick with that for now. There is a noise issue at the flying field, but i was told until the plane is up and they can hear the harmonics that i wont really know. I think the look of the 3 Blade is only what im after.

I hope flying this Pattern Plane is easier than this Amphibious im training in now. My wife is doing so well, i think she's close to going solo and im still trying to land the thing. ""BUT SHE CAN'T ASSEMBLE THINGS WITHOUT LOOKING AT THE DIRECTIONS LIKE US GUYS CAN"". lol :-) So i got her there atleast.

Oh, if anyone has a ( JR 8103 ) radio in new cond, im interested if the price is right.

Thanks Again Guys.

RE: 3 Blade Prop on YS61 / Yes or No ?
 

I have a Saito 82 is a Groovy 50.
Prop clearance is a big problem. A 12" prop is pretty close to as big as I should run
but a 14 x 7 prop works really well, untill I land or take off. Especially land.

Any suggestions?

RE: 3 Blade Prop on YS61 / Yes or No ?
 

Nevermind. <G>

RE: 3 Blade Prop on YS61 / Yes or No ?
 

Nevermind - again. Boy am I wound up this morning! <G>

RE: 3 Blade Prop on YS61 / Yes or No ?
 

P-51, F4U Corsair, F8F Bearcat, etc., all used gear reduction units. I'm sure there are/were many more.

I forget about those pathetic under powered box kites the GA crowd flies around.

As I said in my first response, try it for yourself and see if YOU like it. In the end, that is all that really matters. The three bladed props do look nice on a model and all of the theory in the world never made me smile the way a good looking model makes me smile.

RE: 3 Blade Prop on YS61 / Yes or No ?
 

I'm not familiar with that model, but if it utilizes a wire landing gear, I'd buy a wire bender and get busy making a new long landing gear. If I can do it in only a couple of tries, surely anyone else could too. And it is very satisfying to actually manufacture something yourself. Music wire is cheap and no one need know about the fouled attempts. <G>

RE: 3 Blade Prop on YS61 / Yes or No ?
 

Most pattern aircraft look dumb with tall landing gear, and it does make ground looping a bit more likely. The differance in efficiency between two and three blade props is not that noticeable, so if you find the right three blade, use it. Problem with three blade props is that there are so few sizes and pitch.

Ed sorry if I was so strong. Those old WW II aircraft needed the gear reduction for any size prop because of tip speeds, not for multi blade prop. Nobody is using the very large radial engines anymore, so no more gear reduction. Many GA aircraft go well over 200 HP and are presurized for altitude. These aircraft generally have three bladed props because they must have very high pitch at altitude and yet have good thrust at low altitude, prop clearance is also an issue. However some planes have the same engine and power, but the pressurized version gets a turbocharger and three baded prop. The turbocharger is only used at altitude to maintain sea level presure.