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  1. Flivverflyer

    Tim Lunceford's Centerwing Heath

    I thoroughly enjoyed this video. What an airplane! Comparable to a Minimax in horsepower and overall size, but a totally different beastie. I'd have to drink some fortified testosterone extract to rummy up to this one. Brave men, these racing pilots!
  2. Flivverflyer

    Crashes in the News - Thread

    As a now retired Boeing structural design engineer, I can say a few words about load axis transfer with components in bending. We struggled with it constantly, as my team did a lot of our work in the wing-to-fuselage integration area. Think of two joints: Joint A is a plate bolted up...
  3. Flivverflyer

    Rotax 503 rapid descent-- best throttle setting?

    ...side slip sounds like a good idea... at, like, 5200RPM and 55mph?
  4. Flivverflyer

    Rotax 503 rapid descent-- best throttle setting?

    So the other day I found myself with a lot of excess altitude coming off the Boise hills in my Sky Raider and needing to get down under the Boise Class Charlie shelf (or go way around it). How to descend a thousand feet or more in just a few minutes, without entering the dreaded "lean zone" on...
  5. Flivverflyer

    SailPlanes, How do they get by with just one wheel?

    One reason gliders can get away with a belly wheel is those long wings. You can easily keep the wing tips off the ground for most of the takeoff and landing roll with moderate aileron input. I used to balance on the wheel in a gentle breeze while waiting for the tug, and it was kinda fun to...
  6. Flivverflyer

    Rotax B box question

    So, from your experience, is it way easy to flood the Rotax with a bit too much priming? Or is it pretty tolerant of some healthy squirts? I got a nice backfire once on my Cessna 150 from over-priming (dead of winter), and started a fire around the nose wheel! Apparently, the excess fuel...
  7. Flivverflyer

    Rotax B box question

    I start with five good squishy pumps, then pull at least 60-70 pulls (good workout!). The primer is on the instrument panel, so maybe a couple of feet to the carbs?
  8. Flivverflyer

    Rotax B box question

    Now that we are on the subject, I've been doing a whole lotta pulling lately before I get airplane noise to happen. Is it because of the hot weather? Do I need to prime a whole bunch, or would I just be flooding a good engine if I did? I'm starting to consider an electric starter conversion...
  9. Flivverflyer

    Rotax B box question

    Ah, okay, that explains it then! So the dog clutch is like a direct-drive gear system but with a bit of play between the drive dog gear and the driven dog gear. This is why I can move my blades back and forth a bit before feeling resistance, yes? So, theoretically (not that I'd want to), you...
  10. Flivverflyer

    Rotax B box question

    Newbie alert to start out here-- I have only 15 hours on my new-to-me Sky Raider. I have the 2.58:1 B box on my Rotax 503, with a Powerfin 66" two-blade ground-adjustable prop. I understand the PSRU box has a centrifugal clutch inside. Is it the RK400C clutch? I don't understand why my prop...
  11. Flivverflyer


    I need to know my temps on the Rotax 503, hence I put the CHT/EGT high on my list of critical gages. The ASI, altimeter, and RPM are just markers to check in on occasionally, while I tool along with the radio off, admiring the view. I do agree, though, that the altimeter is essential for...
  12. Flivverflyer

    Heavily inspired ultralight

    Looking at your plan view, it appears that the horizontal tail is too small by quite a bit. Recommend you do some research on tail volume coefficient before locking down the tail surface areas. Stan Hall (designer of the Hall Cherokee sailplane) wrote a short piece on the subject, and he...
  13. Flivverflyer

    Full scale Pitcheron control Sailplane.

    Silent glider is cool, but I just keep thinking: How'd you like to taxi that thing around on a windy day..... Anything over 5kts and I'd be keeping it in my (oversized) hangar.
  14. Flivverflyer

    Glad to have found you guys!

    Mac, All of us model airplane junkies are well familiar with your famous Bell X1 drop from the big B29 routine at SEFF and the Nall and other venues. I wish I had had a chance to see this demo in person! Cool that you have a Sky Raider! I like your long gear legs and big tires... mine has...
  15. Flivverflyer

    Glad to have found you guys!

    Yup, avid model airplane guy here! I used to write for Quiet Flyer magazine, had the technical basics column ("Simply Soaring"), and I still have the hat to prove it! Flying never gets dull or routine for me, no matter what the scale ratio of the model I'm flying. (One-to-one ratio has all my...
  16. Flivverflyer

    Glad to have found you guys!

    So, I noticed that my CHT never gets up to the 350deg minimum placarded temp. I ran it in mid-50 degree air today and the head temps were around 280-290 or so, with a difference between cylinders of no more than 8 degrees. The EGT was a solid 1060F, for both cylinders, at a constant power...
  17. Flivverflyer

    Glad to have found you guys!

    I really like the Ragwing designs. I’m seriously considering a Ragwing Heath for a future project.
  18. Flivverflyer

    Glad to have found you guys!

    You’re right... there is a plethora of good info in these forums. I’m sifting through it now. Steep learning curve here!