Lets have some constructive thoughts:
What causes the fuselage to delam?

1 too much airspeed by overpowered models
2 previous minor, undiscovered defects after hard landings, belly landings a.s.o.
3 improper glue joints

the thousands of faultless flying HotSpot and Roos prove that the basic construction is able to handle even the 120N and more engines.

The part of the fuselage that came apart during last flight showed some significant distorture on the border near the landing gear cutouts. This border was bent like a vane, directing straight into the airstream. It seems that this was the point where the misery begun. I do not believe that at highspeed there is so much pressure in the fuselage that it tends to explode.

Some points to consider:
Cause of a belly landing my Hotspot suffered from a weakened rear fuse joint. The repairs had been done with CA. But this will be a weak point forever.
As you can see in one of the pics above, I did enlarge the main gear cutouts to fit the new legs. This helped to let more air in the fuselage during flight.
If you use a smokertank, pressurized by the engine pressure, think of the fact, that this will not help the fuselage to stay together when the tank blows up and comes in contact with the upper and lower surface of the fuselageīs body.

What to do?
As mentioned above, I will never fly again my HotSpot without having srewed the suspected parts to the 7x7(?) wood former. In addition to this, with the help of my heatgun, I bent the border near the cutouts to help staying to the glue joints. Airstream will pressure this laminate to the former.
Lenīs idea with the toothpicks is also worth a try.

For all new Kits:
It is in the responsibility of the manufacturers to fix this problem.


mec