REFLECTOR: Air intake

[Jack Prock]

Thanks Reiff, 

 

That does help a lot!!

I posted the question a few days ago and since then I decided that I can
always

add a scoop after I'm flying and that I was spending a bunch of time on
something that is

just an extra feature and not necessary for flight. So last night I started
on the air intake that

design that is described in the manual. coming off of the overhead intake
plenum. 

 

I was getting caught up in adding extras that aren't truly necessary, when I
need to get it flying first.

I will save this email, and maybe next winter, I will think about adding
this.

 

thanks again for all the responses.

 

Jack

 

 

From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Reiff Lorenz
Sent: Thursday, March 06, 2014 11:20 AM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Air intake

 

 

Jack,

 

Last summer at Oshkosh, I went to the performance and drag presentations
that James Redmon and Terry Shubert gave. I got there early and asked James
what one modification on his Berkut gave him the largest performance gain.
He said without question it was the belly scoop dedicated to ram intake air
pressure.

 

The whole story (along with lots of other great info) is detailed on his web
site. Specifically, see his write-up on his Clean Ram Air Modification here:

http://www.berkut13.com/berkut61.htm#cram

 

His cautioned me that the scoop helps a lot, BUT . . . you can't just stick
a pre-molded scoop on the cowl and have it work. Most scoops have oversized
openings, don't have the interior shape that allows pressure to build, and
are poorly fared. To get a good performance boost, you have to figure out
exactly how much air your engine needs, size the opening to match, provide
an air expansion chamber, and shape the exterior aerodynamically. To achieve
this, he removed the stock Berkut belly scoop and created a custom one in
2012.

 

Hope this helps!

 

 

Reiff Lorenz, Dayton, OH

Velocity XL-RG, 54% complete

Currently working on: Catching up on Reflector reading!

 

Velocity Owners and Builders Association

 <http://www.velocityowners.com/> http://www.velocityowners.com

 

 

 

 

James Redmon's ram air belly scoop.

 



 

 

 

From: reflector-bounces at tvbf.org <mailto:reflector-bounces at tvbf.org>
[mailto:reflector-bounces at tvbf.org] On Behalf Of Jack Prock
Sent: Monday, March 3, 2014 12:12 PM
To: Velocity Reflector
Subject: REFLECTOR: Air intake

 

Hi,

 

I would like to know if anyone has any thoughts on air intakes. I am getting
down to the last

few items on my list before flight and one thing I was thinking about was to
put in an air intake

scoop under the engine cowling. Something along these lines:

 



 

Now my question, is for the people that have put an external air intake on
the plane.

Do you get a boost at higher altitude because of the ram air effect? Does
the drag of

the scoop outweigh any positive effect from the boost? 

 

I have already started designing the scoop, but now have second thoughts and
wanted

to see if I was going down the wrong path.

 

Any thoughts?

 

Jack Prock

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.tvbf.org/mailman/private/reflector/attachments/20140306/4d54a986/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image002.jpg
Type: image/jpeg
Size: 24545 bytes
Desc: not available
URL: <http://www.tvbf.org/mailman/private/reflector/attachments/20140306/4d54a986/attachment-0002.jpg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image003.jpg
Type: image/jpeg
Size: 6253 bytes
Desc: not available
URL: <http://www.tvbf.org/mailman/private/reflector/attachments/20140306/4d54a986/attachment-0003.jpg>