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  #1  
Old 12-06-2011, 10:50 AM
Jerry Cochran's Avatar
Jerry Cochran Jerry Cochran is offline
 
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Location: Sherwood, Oregon
Posts: 981
Default AFP Injection/Lower Cowl

Hi Folks,

I recently bought David Domeier's -7a which has Don's AFP F.I. setup with ram air. David modified the lower cowling to provide clearance for the alternate filtered air system and I am considering trying to make same a little more aerodynamic. If anyone that has this same system could post here or send me pix and/or explanation of how they did their cowling I would really appreciate it.

I'd kind of like to have an idea of what I'm doing before I start hacking away at the fiberglass.

jerry2dt@aol.com
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Jerry Cochran
Sherwood, Oregon

RV-7a 707DD Bot from David Domeier 12/01/11
Lycoming IO-360 Catto 3 blade Panel upgrade in progress

RV6a 18XP 1st flite 03/21/07 sold to Dale Walter 10/22/2011
Superior IO-360, Hartzell Blended, GRT/Dynon

Happily "autopaying" DR

"Suppose you were an idiot, and suppose you were a member of Congress; but I repeat myself."

Mark Twain
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  #2  
Old 12-06-2011, 11:28 AM
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rleffler rleffler is offline
 
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Quote:
Originally Posted by Jerry Cochran View Post
Hi Folks,

I recently bought David Domeier's -7a which has Don's AFP F.I. setup with ram air. David modified the lower cowling to provide clearance for the alternate filtered air system and I am considering trying to make same a little more aerodynamic. If anyone that has this same system could post here or send me pix and/or explanation of how they did their cowling I would really appreciate it.

I'd kind of like to have an idea of what I'm doing before I start hacking away at the fiberglass.

jerry2dt@aol.com

Rod Bower has a couple video's on his web site: http://www.ramairforhomebuilts.com/products.htm

This are for the RV-10, but it will give you an idea on one way to tackle the problem.
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  #3  
Old 12-07-2011, 11:55 AM
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rbpcool rbpcool is offline
 
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Location: greenville sc
Posts: 55
Default

Rod Bowers Ram Air was a easy install in my smooth bottom cowl with Don's AFP injection
http://i1185.photobucket.com/albums/...redownload.jpg
I recently bought David Domeier's -7a which has Don's AFP F.I. setup with ram air. David modified the lower cowling to provide clearance for the alternate filtered air system and I am considering trying to make same a little more aerodynamic. If anyone that has this same system could post here or send me pix and/or explanation of how they did their cowling I would really appreciate it.

I'd kind of like to have an idea of what I'm doing before I start hacking away at the fiberglass.

jerry2dt@aol.com[/quote]
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  #4  
Old 12-07-2011, 12:00 PM
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Mike S Mike S is offline
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Default

http://www.vansairforce.com/communit...ight=Rod+Bower

You might get some help from looking at the above thread.

Good luck.
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Flying as of 12/4/2010

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  #5  
Old 12-07-2011, 01:29 PM
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Jerry Cochran Jerry Cochran is offline
 
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Default Thanks to...

Bob, Ronald, Mike, great info and pix, just what I was looking for. Also, just bought a Bowers Ramair on B-Stormers. I'll be hacking fiberglass soon.
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Jerry Cochran
Sherwood, Oregon

RV-7a 707DD Bot from David Domeier 12/01/11
Lycoming IO-360 Catto 3 blade Panel upgrade in progress

RV6a 18XP 1st flite 03/21/07 sold to Dale Walter 10/22/2011
Superior IO-360, Hartzell Blended, GRT/Dynon

Happily "autopaying" DR

"Suppose you were an idiot, and suppose you were a member of Congress; but I repeat myself."

Mark Twain
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  #6  
Old 12-07-2011, 01:51 PM
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David had installed an Airflow Performance alternate air duct?

http://www.airflowperformance.com/html/cat_19.html
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  #7  
Old 12-07-2011, 01:55 PM
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Quote:
Originally Posted by Jerry Cochran View Post
Bob, Ronald, Mike, great info and pix, just what I was looking for. Also, just bought a Bowers Ramair on B-Stormers. I'll be hacking fiberglass soon.
Give Rod a call if you didn't already pick up one of his cowl mods for your model RV. It's much easier than fabricating one from scratch.

bob
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  #8  
Old 12-07-2011, 02:25 PM
David-aviator David-aviator is offline
 
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Quote:
Originally Posted by DanH View Post
David had installed an Airflow Performance alternate air duct?

http://www.airflowperformance.com/html/cat_19.html
I did, Dan.

First install was a scat duct source from an aluminum filter box at the standard left intake which I did not like because I simply do not have the skills to make it as you would. (I saw your creation at Don Rivera's FI 101 week end course, it was excellent and he commented on the great flow performance of it)

So, instead of filter box I attached a 45? rubber elbow to the alternate intake part and a K&N cone filter to it, all internal to the engine compartment. It worked well, could not ice up, but lost some power during take off and on hot days.
No big deal with the powerful Lycoming, as soon as I was clear of the runway it was direct ram air into the engine and we were really cooking.
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  #9  
Old 12-07-2011, 03:18 PM
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Quote:
Originally Posted by David-aviator View Post
So, instead of filter box I attached a 45? rubber elbow to the alternate intake part and a K&N cone filter to it, all internal to the engine compartment. It worked well, could not ice up, but lost some power during take off and on hot days.
Thanks Dave.

Jerry, your filtered performance will probably be reduced compared to what David has installed. When filtered you'll have the same hot air source, plus you lose pressure opening the flaps on the canister.
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  #10  
Old 12-07-2011, 10:58 PM
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Jerry Cochran Jerry Cochran is offline
 
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Hi Dan,

Yes, I understand that. Someplace on Rod's site he mentions those flow numbers, maybe in a video so I'll call him tomorrow and ask what the drop is among other questions as to install, etc.

I have read a ton of your stuff on working with fiberglass and hope some of it stuck. You make it look easy.
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Jerry Cochran
Sherwood, Oregon

RV-7a 707DD Bot from David Domeier 12/01/11
Lycoming IO-360 Catto 3 blade Panel upgrade in progress

RV6a 18XP 1st flite 03/21/07 sold to Dale Walter 10/22/2011
Superior IO-360, Hartzell Blended, GRT/Dynon

Happily "autopaying" DR

"Suppose you were an idiot, and suppose you were a member of Congress; but I repeat myself."

Mark Twain
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