WEBRA 91 P5 (# 1067)  
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All Forums >> RC Airplanes >> Pylon Universe - RC Pylon Racing >> General Racing Discussion >> WEBRA 91 P5 (# 1067)
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WEBRA 91 P5 (# 1067) - 8/20/2007 9:55:37 PM   
51er


 

Posts: 18
Joined: 11/9/2002
From: CN
Status: offline 		Does anyone know anything about this engine? Webra specifications indicate it will spin a 14x12 & a 16x8 @ 2000/16000. That is a pretty healthy set of props, I have my doubts about this claim. If I'm wrong, thats great, but I hope it does turn that hard!
       Post #: 1

RE: WEBRA 91 P5 (# 1067) - 8/20/2007 11:54:27 PM   
HighPlains


 

Posts: 2715
Joined: 3/2/2003
From: Over da rainbow, KS, USA
Status: offline 		no way.

(in reply to 51er)
       Post #: 2

RE: WEBRA 91 P5 (# 1067) - 8/21/2007 2:25:00 AM   
daven



Posts: 7012
Joined: 12/7/2001
From: Andover, MN, USA
Status: offline 		I'd have to agree, that is more than agressive.

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(in reply to HighPlains)
       Post #: 3

RE: WEBRA 91 P5 (# 1067) - 8/21/2007 5:30:24 AM   
51er


 

Posts: 18
Joined: 11/9/2002
From: CN
Status: offline 		Ya, thats my thoughts exactly. However, back to the question. Has anybody even heard about this motor? 25 years ago Webra would streach the imagination on their motors and I don't think anybody will see those RPM numbers spinning those props today either. It sure would be nice if someone with experience with one of these motors could tell us if those numbers are correct or not and settle it one way or the other.

(in reply to daven)
       Post #: 4

RE: WEBRA 91 P5 (# 1067) - 8/21/2007 6:12:35 AM   
garys


 

Posts: 776
Joined: 1/31/2002
From: San Diego, CA, USA
Status: offline 		I've got a Webra 91 with the Dynamix slide carb that was in my dad's quarter scale Cub about 25 years ago. I don't remember what prop he ran on it or what it turned, but it ran good. It's the only engine I've seen that you can notice an RPM difference with every click of the throttle stick. There's no way it would turn a 14x10, or anything for that matter, 16000. I think a lot of people get confused when they see a manufacturer claim of RPM's and their recommended props. They are two different things and typically the RPM figures are much higher that you'd get with a reasonable size prop.

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GS

(in reply to 51er)
       Post #: 5

RE: WEBRA 91 P5 (# 1067) - 8/21/2007 1:30:55 PM   
Rudeboy



Posts: 3256
Joined: 12/9/2002
From: Bejing, BELGIUM
Status: offline 		Indeed.

The 2000/16000 is the operating range of the engine.

The 14/12 - 16/8 are prop recommendations. I don't think you can expect to see more than 9000 rpm on those kinds of loads. They are meant to keep things quiet.

It is not mentioned on the Webra site that the engine will spin those props at those speeds.

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Revver Brother #33
...I think it needs more power...

(in reply to garys)
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RE: WEBRA 91 P5 (# 1067) - 10/10/2007 5:55:19 PM   
alpsat



Posts: 100
Joined: 2/5/2004
From: istanbul, TURKEY
Status: offline 		I had one once. Do not recommend. OS 91 fx is far better in all respects.

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Alp

(in reply to Rudeboy)
       Post #: 7

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