ORIGINAL: HarryC
For normal flying around I found that HH on elevator worked very well, but that at higher angles of attack/slower speeds it can give some odd effects and remove some of the information the pilot gets from the stick position about how the model is performing.
What I think might get you in trouble is in those critical flight phases where the gyro may be holding the nose up. Normally we set the CG of our planes slightly nose heavy so in situations where there is less airspeed (approaching stall) the nose wil drop increasing airspeed. If the CG is too far aft the tail will drop instead of the nose increasing the likelihood of a stall.
The gyro can't sense airspeed, just attitude. So if the airspeed gets low there will be no tendency for the nose to drop so you will need to be much more keen to it. That's one place I've seen guys pancake it in with a gyro.
I put an FY-30 stabilization system on my Skymaster F-18. It showed some promise but occasionally it hit some random vibration (it was very welll insulated) and made the jet react violently. I took it out. I still use a simple rate gyro on the nose-wheel. The thing with jets is everything happens so fast.
It's always fun to play with new stuff just make sure you have a good "OFF SWITCH" option and you know exactly how to hit in a split second.
<br type="_moz" />