RE: Great Planes RV-4 .60-.90 ARF  
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RE: Great Planes RV-4 .60-.90 ARF - 3/26/2007 1:00:43 PM   
MOTORMAN37



Posts: 2088
Joined: 10/26/2002
From: CLINTONVILLE, WI, USA
Status: offline 		Dick,
It will still cool better yet even, if you block of the side that has no cylinder.

(in reply to pettit)
       Post #: 151

RE: Great Planes RV-4 .60-.90 ARF - 3/26/2007 1:02:57 PM   
pettit



Posts: 2136
Joined: 12/19/2001
From: Durham, NC, USA
Status: offline 		You're correct, but why fix something if it isn't broken?

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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 MOTORMAN37)
       Post #: 152

RE: Great Planes RV-4 .60-.90 ARF - 3/26/2007 1:13:06 PM   
MOTORMAN37



Posts: 2088
Joined: 10/26/2002
From: CLINTONVILLE, WI, USA
Status: offline 		Dick,
Because I like things the right way. I work in the engineering field, and that is style of thinking. Why do manufacturers cut two big holes in it. Do they not know better.? I am willing to bet, that you can cut down the engine temp by 50-75+ degree's by blocking off the other side.

(in reply to pettit)
       Post #: 153

RE: Great Planes RV-4 .60-.90 ARF - 3/26/2007 1:15:03 PM   
Birman


 

Posts: 423
Joined: 9/3/2006
From: Racine, WI, USA
Status: offline
quote:

ORIGINAL: pettit

No overheating problems with OS .91 4C at any air speed.

I cut a 2" by 4" hole out at the rear of the cowl for air exit.

I put in flight #16 yesterday.


Dick, you you have a pic that you can share?

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(in reply to pettit)
       Post #: 154

RE: Great Planes RV-4 .60-.90 ARF - 3/26/2007 1:15:55 PM   
pettit



Posts: 2136
Joined: 12/19/2001
From: Durham, NC, USA
Status: offline 		Why do they cut 2 big holes in it? Because the full size plane had them and they want the model to look scale.

If I cut the engine temp down by 50 to 75 degrees, it just may run too cool.

But if someone is experiencing an overheating problem, blocking off one hole is the way to go

_____________________________

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

(in reply to MOTORMAN37)
       Post #: 155

RE: Great Planes RV-4 .60-.90 ARF - 3/26/2007 1:19:17 PM   
pettit



Posts: 2136
Joined: 12/19/2001
From: Durham, NC, USA
Status: offline 		Not a good photo, but you can see the dark area in front of the main LG. Thats the hole I cut out

Attachments
Click to see fullsize image.
Click for fullsize


_____________________________

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

(in reply to Birman)
       Post #: 156

RE: Great Planes RV-4 .60-.90 ARF - 3/26/2007 2:06:31 PM   
MOTORMAN37



Posts: 2088
Joined: 10/26/2002
From: CLINTONVILLE, WI, USA
Status: offline 		Dick,
If you have ever looked at a full scale RV-4 like I have, you would realize the openings are very small in porportion to the frontal area of the cowl. I know, my friend has one.

(in reply to pettit)
       Post #: 157

RE: Great Planes RV-4 .60-.90 ARF - 3/26/2007 8:09:18 PM   
Birman


 

Posts: 423
Joined: 9/3/2006
From: Racine, WI, USA
Status: offline 		I'm at the point of installing the stab onto the fuse. It calls for thin CA. Did anyone chance thin CA or did you go with epoxy? Thin CA sounds a little scary, but if everyone is using it then I'll do so also.

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       Post #: 158

RE: Great Planes RV-4 .60-.90 ARF - 3/27/2007 2:03:07 AM   
MOTORMAN37



Posts: 2088
Joined: 10/26/2002
From: CLINTONVILLE, WI, USA
Status: offline 		I used 30 minute Z-poxy. I would never trust thin CA.

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       Post #: 159

RE: Great Planes RV-4 .60-.90 ARF - 3/27/2007 2:09:02 AM   
gunfighter


 

Posts: 629
Joined: 7/13/2002
From: Canyon Lake, TX, USA
Status: offline 		I also used epoxy for the same reason. Does not make sence to use CA on a plane this size.

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       Post #: 160

RE: Great Planes RV-4 .60-.90 ARF - 3/27/2007 2:16:02 AM   
Birman


 

Posts: 423
Joined: 9/3/2006
From: Racine, WI, USA
Status: offline 		Thanks MOTORMAN and gunfighter. That's what I thought. Epoxy it is!

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       Post #: 161

RE: Great Planes RV-4 .60-.90 ARF - 3/27/2007 2:27:57 AM   
gunfighter


 

Posts: 629
Joined: 7/13/2002
From: Canyon Lake, TX, USA
Status: offline 		Just load it up and work it back and forth. And keep lots of paper towels soaked in alcohol handy to wipe off the excess epoxy.

BTW - the landing gear is strong. Our field is expecially rough this week with deer tracks, armadillo holes etc. all over. Four planes ripped their gear off yesterday alone but the RV-4 held up just fine even after a few hard bounces in the holes.

(in reply to Birman)
       Post #: 162

RE: Great Planes RV-4 .60-.90 ARF - 3/27/2007 2:35:14 AM   
Birman


 

Posts: 423
Joined: 9/3/2006
From: Racine, WI, USA
Status: offline 		Good to know. I was thinking about having a set of carbon fiber gear made up but I guess I won't now.

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       Post #: 163

RE: Great Planes RV-4 .60-.90 ARF - 3/27/2007 12:45:43 PM   
MOTORMAN37



Posts: 2088
Joined: 10/26/2002
From: CLINTONVILLE, WI, USA
Status: offline 		I would like to find a carbon wing tube though. It would save about 3-4 oz's.

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       Post #: 164

RE: Great Planes RV-4 .60-.90 ARF - 3/27/2007 2:12:00 PM   
Birman


 

Posts: 423
Joined: 9/3/2006
From: Racine, WI, USA
Status: offline 		Good luck on finding a tube. I searched for over an hour and couldn't come up with one that would work. The dimensions are:
22mm diameter
1.6mm wall thickness
21 3/4" long

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(in reply to MOTORMAN37)
       Post #: 165

RE: Great Planes RV-4 .60-.90 ARF - 3/28/2007 2:08:49 AM   
MOTORMAN37



Posts: 2088
Joined: 10/26/2002
From: CLINTONVILLE, WI, USA
Status: offline 		Birman,
How did you measure yours, mic or caliper? What about Gator RC, they have a Pattern plane Carbon tube that is 7/8 x 30 lg. 7/8 is .875. 22 mm is .866. It would all depend on the tolerances in manufacturing.
http://www.radiosouthrc.com/closeup.asp?cid=103&pid=323&offset=0
I will keep looking though.

(in reply to Birman)