Here's a photo of the AW33%540T arf with the new lite version of the 3W-100B2, this is all that sticks out. My friend has the same plane witha Da100 in his and the hole is very similar if not exactly the same.

I have not owned a BME or DA but I have seen them fly and I'd have to say ,Please give this 3w a chance .. With only 1 gallon of Honda Hp-2 50:1 fuel thru the engine it was taching 6900 with a 26-10 Mejzlik on it for breakin .Too much ripping noise at full throttle so I'm ging to try a 24-12-3 Mejzlik next . I'll probably end up with a 28-10 on it when it's completely broken in at 6300-6500 rpm. This engine starts easily and is coming on more and more with each gallon of fuel and has not missed a beat since I bolted it on.

Hope this helps, Dave