Help with Webra 40  
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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Glow Engines >> Help with Webra 40
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Help with Webra 40 - 4/4/2003 12:38:32 AM   
Zpat



Posts: 558
Joined: 11/9/2002
From: Lima, OH,
Status: offline 		I have a Webra 40 that runs great on cool dry days. Transition from low speed to high speed is perfect and it has plenty of power. After trial and tribulation I've come to the conclusion that outside temperature has considerable effect on needle setting. As the temp goes up and the humidity increases the transition period degrades and I don't really know what the problem is. I run Cool Power 30% helicopter fuel only because I have Saitos that seem to like this fuel. I've heard these engines are intolerant to nitro. Would this be the reason for inconsistency in needle valve setting? I'm hoping there is someone who has experience and would be willing to share it with me.
       Post #: 1

Help with Webra 40 - 4/4/2003 1:11:58 AM   
Perminator-RCU



Posts: 187
Joined: 10/30/2002
From: Avesta, Dalarna, Sweden
Status: offline 		Oh boy, 30% is way too much. 0-10% is usually fine. These webras are made to race and therefore run well on FAI fuel. In Europe where the Webras are manufactured nitro is very expensive (I have to pay about 90-100 USD per gallon). It's going to run very hot on all that nitro. Do your engine a favour. Buy some low(or zero)-nitro fuel.

(in reply to Zpat)
       Post #: 2

Help with Webra 40 - 4/4/2003 1:28:10 AM   
Zpat



Posts: 558
Joined: 11/9/2002
From: Lima, OH,
Status: offline 		Perminator, Is it fair to assume this engine was designed for constant high rpm operation as compared to my flight style which consist of flying at 1/2 throttle for most of the time and only using high rpm for vertical maneuvers and high aoa attitudes.

(in reply to Zpat)
       Post #: 3

Webra - 4/4/2003 8:17:40 AM   
MrMotor


 

Posts: 545
Joined: 1/28/2002
From: Fargo, ND, USA
Status: offline 		ZPAT
The Webra doesn't need to run at high speed all the time. Your problem is the fuel in relation to the temp and humidity. If you need to use 30% nitro fuel you need to add head shims to lower your compression. Webra engines are set up with very little head clearance so they will develop good power on low to no nitro fuels common in Europe. You should add a shim to go to 15% and more shims as you go up in nitro.

_____________________________

Mr. Motor A K A Paul

(in reply to Zpat)
       Post #: 4

Help with Webra 40 - 4/4/2003 5:57:44 PM   
Zpat



Posts: 558
Joined: 11/9/2002
From: Lima, OH,
Status: offline 		Thanks for the info guys. I believe I'll pick up some 10% fuel and try again.

(in reply to Zpat)
       Post #: 5

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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Glow Engines >> Help with Webra 40
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