ORIGINAL: wjcalhoun
I am thinking the ZDZ90 might be about right for this plane- would come in at about 22#
Too bad the mintor 75 twin is not in stock right now.
For me a plane at 'book' 20.5# is a bit heavy for a 55cc; the DLE60 twin is nice, but has the performance of a 55RA. I think the R90 will need a bit more displacement than 55cc.
Agreed that the color is not as striking as the R70, but the white space leaves room for some custom vinyl to dress it up.
I would like to know more about the airfoil - semisymmetrical, or fully symmetrical. Would be nice to have the build manual on line for servo placement (pull pull vs aft mount rudder, etc).
All good info and hopefully we will have some answers soon? Most of us seem to agree on the main points. Engine size, covering, wing design, etc.
If the plane weighs in on the heavy side it would not be as fun a flyer with a 55cc at least the way I like to power my planes. I don't go way overboard but I do go somewhat overboard. I like to keep a decent amount of reserve power.
For instance, for a 46 size I run a 55AX. Simply perfect flyers in my book! And both of my 30cc planes are on the light side and I have plenty of juice for those with the DLE 30cc engines. I had a 40cc on a SIG 300XS Extra and honestly I would have not been afraid at all to go to a DLE 55cc on that plane as it was built heavy and would have been a perfect combo. If the engine weight is not that much more the extra power availability is an advantage.
Microdon, pulled that switch on the R90 yet? 
I know that would round out your Rev fleet
