Larry, Those spinning yarns at midspan are probably plus or minus about 20 degrees in line aft from the mid-span elevator hinge, no? David J. Gall

Jon, I think it means that you have some air leakage around the hinge. The higher-pressure air along the lower surface finds its way through the hinge slot and makes a little jet or invisible geyser o

Dave, Wouldn't that be a useless number anyway? After all, with such variation in the way each airplane is built and the large effect that even small changes can have on such a clean airframe, I doubt

Jeff, Welcome aboard! Sometimes this list gets real quiet for a while, then it heats up again. Give it time.... For the builder list, try joining the QBA. It's $20 a year for a builders list and 6 gre

Umm, Dave, Where'd you get that 1200 fpm climb rate calculation? I think you forgot to factor in some things... like the prop efficiency and the (flat plate) drag... :-) David J. Gall

Dave, What software are you using for modeling and CFD? David J. Gall

Thanks for the testimonial, Mike. Yes, those are sure close enough to be "the Gall numbers." I guess I'll have to start calling 'em the "Dwyer numbers" since you did it first. I always kinda suspected

Tom, I've moved! Sorry I didn't notify you before the big update. Please send my future newsletters to: David J. Gall 3876 Heritage Oaks Ct. Oviedo, FL 32765 Thanks!

Jim, Isn't "pupating" something that caterpillars do? :-) I've always been a fan of the Farnum tailwheel and the LaRue brakes. These are, without a doubt, the best ways to accomplish these two tasks.

Not to dispute, only to inform: the size of a Word file is often a function of how many times that particular file has been edited. Save it using "save as" and then give it a new file name and often i

Pat, The out-and-back ground speed run has been the standard method of calibrating the airspeed indicator for "position error" for a number of years now. Your example is absurd, but a more realistic e

Hi, Al, There's an area of the art of aviating that no one ever seems to mention any more, and that's the gulf separating experiment from application. As pilots, we are so used to reading a number fro

Tom, Winglets impose structural loads on a wing just like extending the wingspan would. I think people are rightly cautious about such major modifications. I wouldn't want to put anything substantial

Allen, Ain't it the truth! :-) How do you "know what error it contains" unless you calibrate it by comparing it against the groundspeed? I'm confused here: how did you check for errors in order to say

Thanks, Al <big grin>! David J. Gall

Larry, Could you post a link to your pictures? I can't find your website address. Thanks, David J. Gall

Larry, Thanks for the testimonial and kind words. To fill in the rest of the story, what reflexor settings have you been using for takeoff and landing, and do you anticipate changing those settings? A

If you swing the dead chicken over your head the cat will get distracted and then you won't know which way is up, and you'll probably lose sight of the duck, too, so you won't know where to go. Then t

Dave, Chris, No, the glass is to be laid up over WET micro slurry. The wet slurry is what provides the mechanical bond between the glass and the foam. If there are any voids in the foam, fill them wit

Jon, I must have missed this item. Did RAF ever endorse the hard-shell procedure? If not, did they ever renounce it? Either way, can you narrow down the approximate year in either the CSA or RAF newsl