Hi Matt,

Glad that I've helped in some small way. As for the Sirius to Altair conversion...make sure you use the BIG Orion fin and rudder and the gear, that is about it. I'll look at the horz. and elevator drawings to see which they used. There was several tail section changes, both in vertical and horizontal's and it's hard to keep up with them all. I've found that they were building all of the machines, as in model types, at the same time and as they would improve on a part for the later models they would incorporate these new parts into the other "earlier" models, (hope this makes sense) an example was the LATE model big fin and rudder on the Air Express which was designed with the short fin and rudder. The Altair had a 2 degree wing, there was 2 and 3 degree wings but it appears that only the late model Orion's had the 3 degree wing.

Well it's off to the flying field... Again I'm glad to help in any way that I can.

Al