• Become a Subscribing Member today!

    J3-Cub.com is the largest community of J3-Cub pilots, owners and enthusiasts. With over 1000 active members, we have fostered a vibrant community and extensive knowledge base.

    Access to the J3-Cub.com community is by subscription only. Membership is only $49.99/year or $6.99/month to gain access to this community and extensive unmatched library of knowledge.

    Why become a Subscribing Member?

    • J3-Cub.com hosts a library of over 13 years of technical discussions, J3 data, tutorials, plane builds, guides, technical manuals and more.
    • J3-Cub.com also hosts an extensive library of J3-Cub photos.
    • You will also receive two J3-Cub decals!

    Become a Subscribing Member and access J3-Cub.com in full!

    Subscribe Now

Engine stumble in knife edge flight

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.

Shack 29H

Well-Known Member
Joined
Mar 6, 2020
Messages
105
Reaction score
76
Was out messing with slow roll mechanics today and the engine kept stumbling when left wing 90 deg down and close to full top rudder,
positive G. Had 8-9 gallons in the 12 gallon header tank. C-85-12F with Marvel Schebler MA-3SPA carb. Right wing down was no problem with full top rudder. Tried it knife edge for 15-20 seconds with no rudder (or wing loading) and the fuel delivery was unaffected no matter which wing was down.

Tried it several times left wing down, hard top rudder, and hawked the G meter to make sure I wasn't unloading to 0 or negative G. Almost had it quit entirely once, which got my attention as I don't have a starter.

Any ideas?

I was under the impression that as long as there was some positive G the engine wouldn't fuel starve.
 
Last edited:

Latest posts

Back
Top