Zenith Pegastol wings Assistance

HAWK Aviators (www.hawkaviators.org)
We are in the process of working a 701 with the Pegastol wings. We have a question on the fuel system with the 2 wing tanks each side. It is set up so that the fuel is fed from the leading edge of the wing which to us looks like it would present a problem of no fuel during a climb.
Any input would greatly be appreciated and also a contact that could be useful for questions as we are moving forward with this project.

Thank you
Bryan Miller
10CO Mack Mesa, CO

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Replies to This Discussion

Permalink Reply by Joe Spencer on August 30, 2017 at 1:34pm

There is a current thread going on the 701 forum dealing with what you're talking about. I agree it does sound like it may be a problem.

Permalink Reply by Bryan Miller on August 30, 2017 at 1:36pm
How do I find the forum you're talking about. I'm new just getting into this site.
Permalink Reply by Gary Eady on August 30, 2017 at 10:06pm

Hi Bryan

My Pegastol wings have a single 30 litre tank in each wing. I feed both tanks to a 15 litre header tank behind the fire wall which in turn feeds the engine.

I put a sight glass (clear plastic tube) on the header tank to ensure there is sufficient fuel available/visible. Haven't had any problems with fuel flow from the wing tanks to date. I think from memory the tanks were originally intended to be vented at the wing tips but I have put an ali tube vent on the top of the wing facing the airflow. The theory being that it pressurises the tanks slightly. Seems to work.

I've got both tanks out at the moment to try and sort out a few leaks and was looking at putting an outlet at the rear of the tanks as an extra. At the moment there is about 4.5 litres unusable per tank.

Happy to help with any other issues you might have.

Cheers

Gary

Permalink Reply by Joe Spencer on August 31, 2017 at 7:01am

Bryan

if you have a 701 # you can access the 701 forum on this site.

here's the thread, I don't know if you can access or not.

read all the way thru

http://www.zenith.aero/group/stolch701/forum/topics/aluminium-fuel-...

Permalink Reply by Bryan Miller on September 1, 2017 at 10:22am
Sir,
Just back on here this morning and I'm looking at it, looks like I've got some reading to do..

Thank you
Bryan
Permalink Reply by Bryan Miller on September 1, 2017 at 10:31am
HI Gary,
I'll show my group what you have going on there, is there any chance you could send some pics as well? What are your fuel tanks made of? Is there a way to add a fuel outlet at the rear.. the guys were looking at adding an outlet to ours at the rear but the problem comes into how to "weld" into the plastic the new fitting..

Thank you
Bryan
Permalink Reply by Joe Spencer on September 1, 2017 at 12:38pm

Bryan

so your outlet is on the same end as the filler spout? Something's not right about that. Can you post a pic of it?

Permalink Reply by Bryan Miller on September 1, 2017 at 2:38pm
The outlet is on the leading edge of the fuel tank, i believe under the filler cap.. I'll get pictures of our situation as I get out to the airport tomorrow.
Permalink Reply by Joe Spencer on September 1, 2017 at 2:55pm

That sounds like a tank designed for some level ground type operation. Feeding from the front won't work unless I missed something big in fooling with these things for 50 years. The inlet needs to be front outboard top and the outlet near the rear corner inboard bottom.

Permalink Reply by Bryan Miller on September 1, 2017 at 4:59pm
That's right... I'll have better pictures and descriptions tomorrow and even more questions once I am with the rest of the folks at Mack.. I'm excited to have more eyes and input on our plane..
Permalink Reply by Stan Cooper on September 1, 2017 at 6:40pm

I'm not that familiar with the 701 wing tanks, but from the fuel tank drawing at CH701 Sample Drawing 7-V-11.pdf it looks like the fuel outlet is at the aft bottom corner of the tank.

Permalink Reply by Stan Cooper on September 2, 2017 at 8:39am

Please ignore my post above. Reviewing the available literature on the 701 Pegastol wings, the fuel tanks are very different. My apologies.

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