Author Topic: Fox 35 upright mount - uniflow tank location off mounts? (Read 718 times)

Dennis Toth · « **on:** July 17, 2012, 12:38:34 PM »

Guys,
Its been several years since I set up a Fox 35 and wanted to save some time so I thought I'd see what's working for people. I am building an El Diablo that has an upright engine mount. I plan to use a uniflow tank with muffler pressure and have set it up to have the uniflow line in line with the spraybar. I did a search on both this forum and SS about tank height location and didn't find anything.

The question is with the Fox 35 does it like the centerline of the uniflow in line with the spraybar hole or does it trim out above or below that point?

Also, I will be using a ST type NVA - what is the position of the spraybar hole relative to the venturi - straight down - forward crossflow or rearward crossflow.

Best, DennisT

Jim Kraft · « **Reply #1 on:** July 17, 2012, 12:52:02 PM »

Of all of the planes I have built for Fox 35's upright, the tank has always been mounted right on the mounts which puts the tank feed tube inline with the spary bar. That includes my El Diablo. As far as the hole in the spraybar, to me it does not seem to make much difference, as long as it is not pointing up at all. I usually try to get it pretty close to straight down the venture. If I remember right, on the El Diablo, you do not have any room to move the tank up or down. You could shim the engine though.

Bill Little · « **Reply #2 on:** July 17, 2012, 07:23:46 PM »

Quote from: Dennis Toth on July 17, 2012, 12:38:34 PM

Guys,
Its been several years since I set up a Fox 35 and wanted to save some time so I thought I'd see what's working for people. I am building an El Diablo that has an upright engine mount. I plan to use a uniflow tank with muffler pressure and have set it up to have the uniflow line in line with the spraybar. I did a search on both this forum and SS about tank height location and didn't find anything.

The question is with the Fox 35 does it like the centerline of the uniflow in line with the spraybar hole or does it trim out above or below that point?

Also, I will be using a ST type NVA - what is the position of the spraybar hole relative to the venturi - straight down - forward crossflow or rearward crossflow.

Best, DennisT

Hi Dennis,

I suggest starting out with the tank on the mounts. Once you start flying it, if the lap times are way off inverted versus upright then shim the tank or engine to get them the same.

Bill

Jim Thomerson · « **Reply #3 on:** July 17, 2012, 08:21:59 PM »

I would fly the airplane with the uniflow in line with the spraybar. If it doesn't run the same upright and inverted, I would pop the back end off the tank and move the uniflow up or down, as needed, about 1/16 in.

Author Topic: Fox 35 upright mount - uniflow tank location off mounts? (Read 718 times)

Dennis Toth

Fox 35 upright mount - uniflow tank location off mounts?

Jim Kraft

Re: Fox 35 upright mount - uniflow tank location off mounts?

Bill Little

Re: Fox 35 upright mount - uniflow tank location off mounts?

Jim Thomerson

Re: Fox 35 upright mount - uniflow tank location off mounts?