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Trainer .46 - 7/2/2008 3:56:07 PM   
berrs003


 

Posts: 14
Joined: 5/16/2006
From: KentKEnt, UNITED KINGDOM
Status: offline 		Irvine 46 strapped to a trainer.....

Best prop for vertical aerobatic/performance ?????????????
       Post #: 1

RE: Trainer .46 - 7/2/2008 4:37:55 PM   
big max 1935


 

Posts: 1668
Joined: 11/22/2002
From: huron s.d.
Status: offline 		I don't know about a aerobatic trainer but a 11" ,4 or 5 pitch prop will pull good without too much speed. Max H.

(in reply to berrs003)
       Post #: 2

RE: Trainer .46 - 7/3/2008 6:44:21 PM   
dditch


 

Posts: 53
Joined: 6/2/2008
From: Laurel, MD, USA
Status: offline 		I think the basic principal is that a larger pitch smaller diameter prop will get you more speed but less thrust at the low end acceleration.
Larger diameter prop with lower pitch is going to give you some "giddyup and go" from a standing start and vertical as your climbing.
That's why helicopters who hover have a large diameter rotor.
I believe when I did pattern flying, I had a large diameter lower pitch prop so that I could control a constant speed thru my manuevers. I did not care about flat out speed but wanted to say make a big loop and have power thru the climb and be able to accelerate when needed.

I was just having this conversation at the field this morning before work. A trainer can have lots of drag. Lowering the diameter and increasing pitch might help a streamlined plane to get more speed but you get into dimminishing returns. A larger diameter pitch prop could be more efficient and give better performance overall in the climb.

A larger diameter pitch prop can also hit the grass easier on takeoff and landing.
If you go larger diameter and too much pitch, the engine max RPM can drop. This can make the engine less efficient and also make it harder to set your needle (which usually MUST be reset w/ a different prop or different brand of the same size prop).

If you are flying say the common 10x7 APC now, try an 11x5 or 11x6 APC and see how you like it.


read this link:
http://www.dubairchobbies.org/propeller_tips.htm

(in reply to big max 1935)
       Post #: 3

RE: Trainer .46 - 7/3/2008 9:57:53 PM   
spiral_72



Posts: 511
Joined: 3/7/2007
From: Chesnee, SC, USA
Status: offline
quote:

ORIGINAL: berrs003

Irvine 46 strapped to a trainer.....

Best prop for vertical aerobatic/performance ?????????????


If it's possible for that plane to pull vertical it's gonna be with a 12.25x3.75 APC prop and some 15% nitro or more.

With that prop and by putting your plane on a diet anywhere possible, you MIGHT get it.

Good luck and make sure you let us know if it works! A picture would be better

_____________________________

Wasn't that cool? I meant to do it.

(in reply to berrs003)
       Post #: 4

RE: Trainer .46 - 7/6/2008 12:31:11 PM   
berrs003


 

Posts: 14
Joined: 5/16/2006
From: KentKEnt, UNITED KINGDOM
Status: offline 		Well... The weather is S*** at the moment but ran it in the garden. Held it skyward in my hands.....It would jump out my hand on a 12.25x3.75 with ease. I have installed a mico servo on the throttle and put in carbon push rods.

All is looking good

Just need that weather now

P.S - What differnece would putting a irvine 53 on the beast be?
The only limitation i can think of is the ground clearance

(in reply to spiral_72)
       Post #: 5

RE: Trainer .46 - 7/8/2008 9:14:56 PM   
spiral_72



Posts: 511
Joined: 3/7/2007
From: Chesnee, SC, USA
Status: offline
quote:

ORIGINAL: berrs003

Well... The weather is S*** at the moment but ran it in the garden. Held it skyward in my hands.....It would jump out my hand on a 12.25x3.75 with ease. I have installed a mico servo on the throttle and put in carbon push rods.

All is looking good

Just need that weather now

P.S - What differnece would putting a irvine 53 on the beast be?
The only limitation i can think of is the ground clearance


Good job! move the CG as rearward as you are comfortable with in 1/8" increments.
If you have any lead in the plane, move stuff around until you can remove it...... One trick I learned is moving the engine toward the firewall helps more than you think if you're adding tail weight for a nose heavy plane.
And you can save about 2oz by trading foam wheels for the stock rubber ones (if applicable)

Next you'll be taking the dihedral out and buying some 3D servo arms!

_____________________________

Wasn't that cool? I meant to do it.

(in reply to berrs003)
       Post #: 6

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