I have built and flown only two twins, both from the Pilot Twin Ace kit. These are 60" span low wing sports models for 19-25 2-strokes. The only deviation from plan was to build out thrust into both engine installations. Both weigh 5-5 1/2 lbs.

No 1, (in 1985) was with 2 x OS 25 FP 2-strokes and the supplied 4oz tanks giving about 10 minutes duration. Being totally absorbed in flying often resulted in an engine out situation as one ran out of fuel.

No 2, (just finished) with 2 x OS 30 4-strokes and the supplied 4 oz tanks. Several engine cuts to date.

Performance with engine out.
Fast, slight yaw and roll compensated for with 1/2 opposite rudder.
Slow, severe yaw and roll, compensated for with power to idle, nose down and rudder.

Crashes (so far)
1. Heavy landing after single engine go-around (never again) bent nose leg. Model 1

2. Heavy landing after applying slight power in a single engine landing. Dropped a wing, recovered, stalled and almost recovered. bent nose leg. Model 1

3. Crashed after engine quit during low pass. Applied full power to good engine and attempted to turn into good engine to line up with strip. Model flicked out of the turn, stalled and failed to recover before nose down, wings level crash. Tore out the poor nose leg and broke front wing dowel. Tail unit separated from fuselage. Model 2

4. Heavy landing after aileron jammed on fuse side (wing attached incorrectly). Did a very exciting circuit using what aileron I had to correct roll and steering with massive amounts of rudder.
"Arrived" wings level in long grass alongside strip. No damage.

Lessons I have learned.

If one engine sags or dies at low speed, low altitude, kill the other engine and treat as a normal dead stick landing.

If the same happens at altitude, set up for an emergency landing using minimal throttle then kill the bloody thing to remove the temptation to stretch the approach.

Do not attempt to squeeze maximum rpm from the engines. If you need max power, get bigger engines.

Do not try to lean out a slow engine to match a fast engine.

Have fun.

These are my experiences with my two small models, hope they have been of interest.

Col