Propeller Size&pitch  
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Propeller Size&pitch - 7/8/2007 5:19:13 PM   
copykat


 

Posts: 2
Joined: 9/26/2006
From: Ruthven, ON, CANADA
Status: offline 		Fellow scale modellers: Here's my problem! Ijust test flew my scratch built 1/4 full scale aeronca champ.The plane weighs 23pounds and is powered by a OS 160 opposed twin swinging aZinger 18X6 @ 7400RPM. Takeoffs are very marginal, Ialmost lost it on the second flight due to a wing stall after takeoff! Once she is airbourne it flys quite well at full and 3/4 throttle. I realize that this plane is way too heavy, but would a different prop give me the little extra I need on takeoff. Thanking All of you guys in advance: Steve
       Post #: 1

RE: Propeller Size&pitch - 7/9/2007 4:49:52 AM   
mtwister


 

Posts: 703
Joined: 11/3/2005
From: Salem , OR, USA
Status: offline 		I think the size you have is right, but you may want to try a different brand. I recommend trying a Vess prop, or a good quality wood like that. You're right, you are intensely underpowered. At 23 pounds, a good 50cc gas would give you very scale like performance.

(in reply to copykat)
       Post #: 2

RE: Propeller Size&pitch - 7/9/2007 5:59:28 AM   
Bass1



Posts: 1817
Joined: 12/26/2002
From: Va.Beach, VA, USA
Status: offline 		Yeah, I'd ditch the Zinger. Not sure about the weight at 23 lbs though. I have a 1/4 scale Bellanca Citabria that is very close to the same airframe and it weighs 16 lbs now. It did weigh 17lbs and the 1 pound weight reduction made it fly noticably "lighter". Can you do anything to lighten your airplane some?

(in reply to mtwister)
       Post #: 3

RE: Propeller Size&pitch - 7/9/2007 1:18:42 PM   
TLH101



Posts: 5540
Joined: 12/27/2001
From: Corpus Christi, TX, USA
Status: offline 		Try an 18x6-10 Zinger. A friend had a cub with the OS 1.60, and this prop really worked well for him. His plane was not as heavy as yours, but it did make a big difference. The rpms went way down on the ground, but in the air it worked well.

< Message edited by TLH101 -- 7/9/2007 1:19:35 PM >

_____________________________

Terry
"Old Fart" in training. (not to be an R/Cer, but to be an "Old Fart")

(in reply to Bass1)
       Post #: 4

RE: Propeller Size&pitch - 7/10/2007 12:20:45 AM   
copykat


 

Posts: 2
Joined: 9/26/2006
From: Ruthven, ON, CANADA
Status: offline 		Dear fellow modellers: Thankyou for all your suggestions. I experimented with acouple of different props. Using a fish scale with my 18/6 Zinger prop Iwas able to produce about 91/2 pounds of pull. Next I tried a 18/8 Zinger and was able to get 12pounds! I want to go and get a18/10 and try it. I am thrilled with the extra pull I got with one step up on the pitch facter. I will let you know how the 18/10 prop works out. As of now I 'm pretty confident that the 18/8 prop will do the trick for takeoff. Again thankyou for your help. Steve

(in reply to TLH101)
       Post #: 5

RE: Propeller Size&pitch - 7/10/2007 12:05:36 PM   
pettit



Posts: 2164
Joined: 12/19/2001
From: Durham, NC, USA
Status: offline 		Use an APC 18-6 wide blade.

It'll make a significant difference but don't expect to hover!

_____________________________

Dick Pettit
Associate Editor, R/C REPORT Magazine
"You Can Buy Better,
But You Can't Pay More"

(in reply to copykat)
       Post #: 6

RE: Propeller Size&pitch - 7/11/2007 10:56:22 PM   
91zulu



Posts: 219
Joined: 2/5/2002
From: Brooklyn, NY, USA
Status: offline 		Or you could put the 160 on steroids by converting it to diesel then you could swing a 20x8 or 20x 10 prop. Then watch the Aeronca get off the ground in 10 feet.

_____________________________

91-Zulu

(in reply to pettit)
       Post #: 7

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