REFLECTOR: ram air

Scott Derrick scott at tnstaafl.net
Wed Jul 5 15:13:46 CDT 2006


My ram air scoop for induction air is mounted to the bottom of the right 
hand strake, I thought it was part of the standard kit?

Scott

Johnny Thompson wrote:
> Jack
>
> Do you have the kit or part number?  Lots to chose from at airflow
> performance.  I have a 540K 300 HP which will be different from the 540C/D
> but should get me into the right area of the catalog.  Also plan on pulling
> cold air through the filter because of the DA in Arizona. I like the scoop
> attached to the fuselage.   Thanks.
>                                             Johnny Thompson
>                                             Sahuaria Az -5 RG
>
> ----- Original Message ----- 
> From: <J.F.Sheehan at larc.nasa.gov>
> To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
> Sent: Wednesday, July 05, 2006 8:21 AM
> Subject: Re: REFLECTOR: ram air
>
>
> The theoretical is possible with a very good designed intake. The practical
> gain in manifold pressure is somewhere between 1/2inch and 1 inch MP. The
> opening of the ram air scoop should be sized for the volume. The passage to
> the servo should be a little larger to allow the volume to expand thus
> maintaining the same pressure at the servo. I used a air scoop from Velocity
> I don't know if it is on the store web site but you can call. The scoop is
> mounted under the airplane just forward of the firewall with the end of the
> scoop coming up right behind the firewall. I have the scoop attached as part
> of the lower cowl. If I had it to do over I would make it attached to the
> fuselage so that i did not have to remove the scat hose connecting the scoop
> to the servo each time I removed the cowl. (Hind sight) Thw scat tube (4
> inch dia) is connected to a  airflow performance adapter (made for IO-540).
> (www.airflowperformance.com) It has a butterfly valve which allows me to
> select ram air or filtered air. The filtered air is taken from inside the
> engine compartment through a K&N air filter attached to the adapter. ( race
> car style).
> In flight I see a difference of 3/4 inch MP at 10K feet between the filtered
> air and the ram air. Photo of adapter shows the air filter the open end of
> the adapter goes to the scoop. it is important to get the scoop opening at
> lest 3/4 inch away from the fuselage in order to be out of the boundary
> layer to keep the drag a low as possible. scoop needs a nice rounded edge
> not a sharp edge.
> I think it was worth the effort and expense
>
> Jack Sheehan
> N55XL
> Race 55
>
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