To set the record straight, the numbers quoted by Tim (aero330lx) of 6700 with a Mejzlik 28-10 are with a Tuned Canister setup on the engine, which boosts power by 200-300 rpm over "stock" DA mufflers. Not to start a "power number war". . .most people are seeing 6400-6500 with this prop combination on "stock" DA mufflers, and given that Aero330lx is using canisters, the loss of 200-300 rpm would tend to validate this power range for the DA100. One other factor is that power numbers vary with engine temperature. No mention is given whether these figures are HOT or COLD (first pull after startup). Cold figures generally tend to be about 100-150 rpm stronger than HOT figures.