Here is the story of my experiments that I reported for my club newsletter, Hope it helps.

Twin Engine Saga: So You Want To Do Twins ? {Part 5} By Twinman

Rule Number 1– Don’t Do Twins– Four Times the Trouble
I guess if you’re still reading this section you obviously aren’t going to listen to rule number one so here is a suggestion to try and ease some of the anxiety associated with flying twin’s. Are gyro’s the answer?
I have previously explained how losing an engine on a twin can result in an inverted flat spin faster than you can imagine. It’s worse on Warbirds with high wing loading and wide engine spacing (P-38, B-25, etc)
I have decided to see if the problem can be solved by using two gyro’s on the plane. One gyro on the rudder, and a dual inlet/ outlet Hobbico “Aero Gyro” on the ailerons. This in mind, and for the glory of Bayou City Flyers (I hope Greenwood is getting this), I programmed my kit bashed Twin Ugly using a 8 channel Futaba to intentionally cause an engine failure and possible crash! Via a rotary dial channel, my copilot, and son Kyle, (who was only too happy to deliberately cause a crash) was able to bring one engine from full power to an idle on my command. As a side bonus this allowed me to sync the engines at idle very easily. After the initial setup and trim in flight I noticed a much more stable aircraft. Maneuvers became really rock solid. Hanging on the prop straight up was almost hands free. Now for the test. I flew level at half throttle, pulled the nose straight up and went to full power. At this time I signaled to the copilot (who was dying to help) to cut one engine to idle. This should have caused an immediate inverted snap roll. It did not. The plane slowly yawed toward the retarded engine. (I said retarded engine not pilot!) I then applied down elevator and flew three laps around the field, at various power levels, in a tense but controlled manner. The plane was flying at almost a 30 degree yaw angle in level flight, but fly it did and it should not have. I signaled my copilot (who had his mouth open in amazement or disappointment!) to bring the idling engine back up to speed. The engine promptly died! Naturally there was a cross wind, and I’m starting to have chest pains! The landing however was uneventful.
While these tests, at this time,are by no means a conclusive, this test did prove that the concept works. The gyro’s, as used here, do not take control of the plane but rather dampen unexpected actions sufficiently to allow you time to react. If you have to rely on your reflexes to do this you are already about a second or two behind the plane which, in a lot of cases, is too late!
As a side note I used the Hobbico “Aero Gyro” because it allowed me to use separate channels for the two aileron servos so I could mix in aileron differential. You could also couple the elevator and ailerons for more positive elevator control. This gyro also allows me the option of turning it off in flight as needed for aerobatics.
Are gyros the answer? Nothing replaces ability, but they do allow you to relax a little while flying twins. I have already had my heart attack trying this and could use a little relaxation.

Additional. This concept was further tested on an Areotech P-38 and was proved to be a viable way to control the P-38.

Since I wrote this story, I have used the two gyro system on three P-38's and lost engines several times. It does work.

Good Luck,
Twinman