fun fly prop

[TeddyTyler]

I want to build a lainer fun fly and do some vertical 3D , with a 46 motor ,weight about 3.5 to 4 pounds, what size prop do I use with this set up/ Thanks:o

[Paul Susbauer]

Try the APC 12 x 3.75 prop (I think thats the pitch) thats the fun fly prop of choice.

--Paul

[TeddyTyler]

Originally posted by Paul Susbauer
Try the APC 12 x 3.75 prop (I think thats the pitch) thats the fun fly prop of choice.

--Paul

I have a 12x4 and 11x5 what do you think

[Paul Susbauer]

I'd go for the 12 x 4 as it will give you more disk area which will be easier for hovering, and that will make slower speeds possible with the greater drag. You'll have more thrust but, it will be a very low speed thrust, meaning when you climb out of a hover, its not going to ballistic.

Personally if you have both, try them both. It never hurts to experiment.

Good luck.

--Paul
www.oldschoolrc.com

[TeddyTyler]

[QUOTE]Originally posted by TeddyTyler
[B]Thanks for the information , your right on my fun fly its really not for 3Dhttp://http://engineering.dartmouth.edu/~mshop/Graphics/lanier.gif

[dean03]

I use a 12.25x3.75 APC prop on my Cougar 2000....

[Paul Susbauer]

What engine are you running on your Couger?

--Paul

[dean03]

Its a OS 46 FX nice engine

[TeddyTyler]

thanks , Ill use a 12x4 master airscrew prop .with my 46 magnum ball bearing motor on my fun fly should I increase the alerons width?file:///C:/My%20Documents/funfly.art

[dean03]

i dont like master airscrew props because they dont give the performance of a APC....



Dean

[TeddyTyler]

http://www.lanierrc.com/lrcprivate/images/airplanes/oldlrc%20plane%20images/funfly.GIF

[TeddyTyler]

OK DEAN Ill purchase an APC

[dean03]

looks like a nice plane...
It may prophang with that engine in...

Dean

[TeddyTyler]

Dean , do you think the alerons will have to be made larger they are 1 inch in width?

[dean03]

Hi they should be fine

Dean

[flyfalcons]

Wow you'll definitely be able to prop hang with that plane/engine combo. They come out very light. Because you have an incredible power to weight ratio you may want to go with a smaller prop that'll spin up faster. I ran a 12.25x3.75 on a Supertigre 45 mounted on a Pizza Box Flyer, and it was a lot of prop for that engine. I now have a 10x6 on it, which gives me much better performance and throttle response. When you play down low it is nice to have instant power. You may want to make a larger elevator and rudder for your plane to allow better control during a hover.

[Tram]

The APC 12 x 3.75 is the sweetest 40 sized funfly prop on the planet..

I buy them buy the dozens. :)

[Tram]

The APC 12 x 3.75 is the sweetest 40 sized funfly prop on the planet.. I buy them buy the dozens. :) If your wanting to try hovering, etc.. I wouldn't use the 10x6.. 10x6's are good for buzzing around.. I haven't used one in years...

[TeddyTyler]

Thanks for the advice, on the 12x 3.75, prop I dont have size but I do have lots s of 12x4 s, should they be close enough useing my 46 bb magnum engine to hover? any way , where did you buy those props that you like ?:confused:

[Tram]

Originally posted by TeddyTyler
Thanks for the advice, on the 12x 3.75, prop I dont have size but I do have lots s of 12x4 s, should they be close enough useing my 46 bb magnum engine to hover? any way , where did you buy those props that you like ?:confused:

Yeh, a 12x4 will do it.. That's what I was flying before the 12.25x3.75.. A guy I fly with hooks me up with them.. he has a small "hobby shop" for the club.. But you can get them at Tower..

Use the 12x4's and then get some 12.25x3.75 on your next order or run to the LHS... the 12.25x3.75 will make a huge difference.. Just don't try too many full throttle runs..

[TeddyTyler]

Say what brand from Tower are your 12.25x3.75 props And How come you mentioned DONT GO TOO MUCH FULL THROTTLE? IS IT TO MUCH STRAIN FOR THE 46 MOTOR?http://ourworld.cs.com/ronplanes/images/midstar2.jpg

[Tram]

Hey man,

they are APC props.. The only thing about going full bore is that I have heard you can seize the engine with these props if you run at full bore for long periods of time... I don't know how true that is.. I've done lots of hovering.. at full throttle to pull out and haven't hurt anything :)

[flyfalcons]

I can see seizing a 46 engine with that prop because it borders on being too much. Also a good way to go through glow plugs pretty quick is by swinging too large of a prop.

[Tram]

Originally posted by flyfalcons
I can see seizing a 46 engine with that prop because it borders on being too much. Also a good way to go through glow plugs pretty quick is by swinging too large of a prop.

Yeh, I've heard that.. I haven't had a single problem though.. Been flying the same engine for about 2 years with the 12.25x3.75..

[Paul Susbauer]

Yeah, practicing throttle management will get you decent life from your engine. Running the bigger diameter props effectively gives you more disk area, which is much easier with the lower pitch speed than trying to use a 10 x 6, especially on a 46.. which makes that a screamer.

--Paul

[Dunc]

Why does a big prop decrease the life of a glow plug??
Dunc

[TeddyTyler]

my guess is the engine runs much hotter swinging a large prop and the element in the glo plug cant take it.:eek:

[flyfalcons]

My guess is as good as anyone else's, what Teddy said sounds good. I have first hand experience with swinging too large of a prop, and I burned up three glow plugs in less than a half gallon of fuel.