RCU Forums - View Single Post - New DA100 or BME105?
View Single Post
Old 05-29-2003 | 12:57 PM
  #19  
Kris^
Banned
My Feedback: (1)
 
Joined: Jan 2002
Posts: 1,222
Likes: 0
Received 0 Likes on 0 Posts
From: concord, NC
Default New DA100 or BME105?

John VH. . a few things to think about:

First of all, Hp numbers mean NOTHING. . I can make a Cox .049 make 10 hp if I can get it to spin fast enough (something like 1,000,000 rpm or so, I guess) The manufacturers/supliers throw these numbers at us as a marketing tool/comparison. They even admit ( no names being dropped here) that they either have to turn a ton more RPM than we will ever see, to get those figures, OR, they just picked a number because they wanted their brand-new motor to appear "stronger".

Second. . Anything from a G-62 to a ZDZ120 will fly that plane, it just depends on what motor YOU want to use. Every motor will have their strong points and weaknesses (G-62 is the cheapest, weakest and heavy as hell, ZDZ is heaviest, probably most powerful, the others fall in between) It's yup to YOU, the buyer, to decide what you want the plane to do, and which brand of engine you want to be "loyal" to.

In generalities, the 4 best motors for that airframe are as follows:

ZDZ80. . good dependable powerful single, shakes more than the others, least power of the group (80-110 cc's)

BME102/105, lightest twin, will balance the easiest on that plane, extremely smooth midrange with minimal imbalance/vibration issues. . really the best option for that airframe if you want to do AEROBATICS ONLY because you will be able to keep the plane lighter than with other twins, and the engiens performance characteristics are aimed at this sort of flying.

DA-100, more power than the BME, very smooth mid-range and transition (the BME and DA are equal in this area), 300-400 rpm stronger than the BME, also 1.5 lbs heavier so you need to shift weight towards the tail to balance the plane, which will make it more prone to overrotation or end-heaviness issues if you want the most precise flying possible.

3W 106. . .admittedly the Horsepower king, but the midrange and transition are very much like a light-switch. the engine is ported for top-end power numbers, NOT for transition and mid-range smoothness. (FORGET the stupid claims of "More Torque". . .it's a marketing ruse, nothing more) 3W's, due tot he porting designs, tend to have fuel puddling and "burbling" in the mid-range rpm area, and it's almost impossible to get rid of. . for Aerobatics and smooth flying at mid-throttle settings, the 3W suffers because of these design deficencies. Now if you want a top end motor with gobs of power that hauls boogie in a straight line and has better vertical, get the 3W. .

For adequate Aerobatics and decent 3D. . ZDZ80

Best Aerobatics and good 3D. . BME 102/105

Great Aerobatics and very good 3D. . DA100

Decent aerobatics and Great 3D, 3W106.

It all depends on what you want to do with the plane. Forget "piped" claims and setup claims, everything changes with those, especially the powerband characteristics, and the weight goes up as well.