John - we have had plenty of hands on camparisons of the DA100's to the 80 -- If the 80 has a good exhaust system -it is hard to see the difference in power between that and good running DA100. for example --
If the airframes are both light - - The 100 's typically are stronger -as should be expected .
On the very light airframes - where either setup goes like stink straight up - you have to toss a coin.
The DA100 in any of the H9 models really works - but H9 really frowns on engines over 80 cc for these .
Ask em.
The problem?
guys who fly at one speed - flat out .
Iknow about claimed structural problems - which are simply a result of careless , fast flying
I am doing a new 330 with the 80 and a quiet non tuned can - keeping the weight to mins - but no surgery on structural parts.
At this altitude - they work well to about 26 lbs - after that - just too heavy for sharp performance with the 80's.
My next 100 powered model will be in th low twenties - I am spoiled by the 3D setups I have been building --from Himax powered foamies to big stuff -
We just did a Cap -40% glass fuselage foam wings etc.. with a 210 and large quiet cans -
It should be a good 3Dsetup