40 hour fly off is going slow. 9.5 hours so far. Having a couple of small issues....fuel is transferring from left to right in flight, not sure why.

Been adjusting prop pitch flatter, at 12 degrees, getting max 5200 rpm full throttle, level flight. Going to reset to 11 deg in search of 5600 rpm static. Makes me wonder about actual horsepower.

Engine itself is running smooth, no issues, but I do experience an unusual vibration when throttling back for descents (from memory seems like somewhere around 3600 rpm). If I slow engine further, vibes go away. I believe this is due to prop windmilling, trying to "push" engine through the rubber damper drag links that connect the reduction gbox.

Averaging about 4.5 gal per hour.

Made a few passes over the future runway here:


Steven Winn

Views: 308


You need to be a member of Zenith Aircraft Builders and Flyers to add comments!

Join Zenith Aircraft Builders and Flyers

Comment by Dan Stanton on January 5, 2013 at 1:54pm

Hi Steve,

Had the same thing with fuel on both the 801 and 701. Never did stop it. I put valves on both tanks for the 701 and just shut off the one that is draining faster that day, never the same one. I ended up with 11.4 deg on my engine.

Ane the fuel burn is about the same.

Dan Stanton

New from Zenith:

Zenith Planes For Sale 

Classified listing for buying or selling your Zenith building or flying related stuff...

Custom Instrument Panels
for your Zenith

Custom instrument panels are now available directly from Zenith Aircraft Company exclusively for Zenith builders and owners. Pre-cut panel, power distribution panel, Approach Fast Stack harnesses, Dynon and Garmin avionics, and more.

Custom Upholstery Kits for your Zenith Aircraft:

Zenith Vinyl Upholstery Kits

Zenith Apparel from EAA:

Zenair Floats

Flying On Your Own Wings:
A Complete Guide to Understanding Light Airplane Design, by Chris Heintz

Builder & Pilot Supplies:

How to videos from HomebuiltHELP.com

Developed specifically for Zenith builders (by a builder) these videos on DVD are a great help in building your own kit plane by providing practical hands-on construction information. Visit HomebuiltHelp.com for the latest DVD titles.

Aircraft Insurance:


West Coast USA:

Pro Builder Assistance:


Transition training:

Golden Eagle Aviation

Pianosa Flying Farm

Aircraft Spruce & Specialty for all your building and pilot supplies!

© 2020   Created by Zenith.Aero.   Powered by

Badges  |  Report an Issue  |  Terms of Service