It's not just stalled, portions of it is actually creating negative thrust and the portions that are not contributing to thrust are creating drag on the engine. 

On Mon, Aug 1, 2011 at 4:57 AM, Tracy <rwstracy@gmail.com> wrote:

No negative effects that I know of.   I used one for awhile on my RV-4 but was not happy with it's efficiency at high speed.   Worked great for takeoff & climb but area near hub was stalled and draggy at cruise & high speed.

Works better on canards because that area is in turbulent air anyway.

Tracy

On Mon, Aug 1, 2011 at 1:48 AM, Samuel Treffinger <samuel.treffinger@gmail.com> wrote:

Tracy, do you know of any negative side affects of using a IVO magnum inflight adjustable prop with your psru?? I think John Slade has that configuration, but I was wondering if you reccommended it, or reccommended against it.

 

Sam