Your experience with in-line twins  
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Your experience with in-line twins - 3/15/2007 5:53:26 PM   
EICAS



Posts: 424
Joined: 8/23/2002
From: Missisauga, ON, CANADA
Status: offline 		I would like to get some feedback if possible about your experience with a 150cc in-line twin like the 3W-150R2 or Sachs 140cc. I have never owned an in-line twin and I do not know much about Sachs engines.

Any input would be apprecieted,
Thanks
Peter

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Behotec and WREN Turbojets - Turboprop - Helicopters
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RE: Your experience with in-line twins - 3/16/2007 12:53:55 PM   
pettit



Posts: 2136
Joined: 12/19/2001
From: Durham, NC, USA
Status: offline 		There are only three (3) problems with inline twins as far as I know:

1- Cooling the rear cylinder

2- Cooling the rear cylinder

and

3- You guessed it, cooling the rear cylinder.

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

(in reply to EICAS)
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RE: Your experience with in-line twins - 3/22/2007 11:33:38 PM   
jamesc43


 

Posts: 181
Joined: 6/23/2003
From: Colorado Springs, CO, USA
Status: offline
I am preparing to build an inline twin also. I am wondering if converting the rear motor to electric would have an effect on the need for cooling to the rear motor. This is not going to be a giant scale but it will have a 94" wingspan.

James
1234

(in reply to pettit)
       Post #: 3

RE: Your experience with in-line twins - 3/23/2007 11:50:37 AM   
pettit



Posts: 2136
Joined: 12/19/2001
From: Durham, NC, USA
Status: offline 		I think Eicas was planning to use a 2 cylinder inline twin engine on his plane.

I believe you are building something like a Cessna TwinMaster with an engine in front and another in the rear.

Totally different scenario.

Plus, at 94" span, it IS giant scale.

_____________________________

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

(in reply to jamesc43)
       Post #: 4

RE: Your experience with in-line twins - 3/24/2007 3:21:06 AM   
IFLYRC-RCU


 

Posts: 420
Joined: 1/6/2002
From: Canton, MI, USA
Status: offline 		Cooling the rear cylinder... What plane and what configuration is the cowl ??

Well, some serious thought and ductwork can "help" direct the air inside the cowl.... trial and error stuff.

Or, if the engine has 2 seperate carbs.. make the rear carb slightly rich to provide a little extra lubrication.. thus "cooler"

But, as stated before.... "Cooling the rear cylinder" is usually a challange

It can be done.. but be careful.

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IFLYRC - IMAA

(in reply to pettit)
       Post #: 5

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