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Marc Zeitlin

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Marc Zeitlin last won the day on February 4

Marc Zeitlin had the most liked content!

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About Marc Zeitlin

  • Rank
    Flying Cozy MKIV N83MZ
  • Birthday 08/06/1957

Flying Information

  • Flying Status
    Flying - 1600 hrs.
  • Registration Number
    N83MZ
  • Airport Base
    KTSP

Personal Information

  • Real Name (Public)
    Marc J. Zeitlin
  • Location (Public)
    Tehachapi, CA 93561
  • Occupation
    Principal - Burnside Aerospace
  • Bio
    www.mdzeitlin.com/Marc/bio.html

Project/Build Information

  • Plane
    Cozy Mark IV
  • Plane (Other/Details)
    COZY MKIV
  • Plans Number
    386

Contact Methods

  • City
    Tehachapi
  • State/Province
    CA
  • Country
    United States
  • Email (Visible)
    marc_zeitlin@alum.mit.edu
  • Phone Number
    978-502-5251
  • Website URL
    http://www.cozybuilders.org/

Recent Profile Visitors

2,401 profile views
  1. Hah! When I was a boy, we'd contour sand with a wet strand of spaghetti, wrapped with hot gravel. You try to tell kids these days, and they won't believe you. In any case, it'll be a cold day in hell before I build myself another airplane, so this contest will have to occur in another lifetime...
  2. Well, yeah, I could wrap a piece of 80 grit around a ball-peen hammer and contour a plane, but it wouldn't be pretty :-). I'm shooting for optimal, not adequate here :-).
  3. Yes, that would work, _IF_ the extrusion is perfectly straight and flat. There are few 2x4's on the planet that are flat/straight enough to use for a sanding block - you'd never get a really good contour. 3" is a bit narrow, although it would take a 3" roll of paper. I used a 1/2" thick piece of plexiglass as large as 3 sheets of 3M wetordry sandpaper, and glued a 2" x 2" AL extrusion to the back to keep it straight. With 3 sheets of paper on it, being about 33' - 36" long, you get really good coverage and straightness/flatness on your contours. 18" is marginal for wing/canard contouring, IMO. The larger the sanding block, the better your contour will be.
  4. I can put you in touch with the guy who has the COZY MKIV on the big island (PHMU) if you want to talk to him about shipping, owning, or flying a MKIV.
  5. So there is a COZY III that has "flown as far as Hawaii". That's N22AZ, flown by Damon Meyer, which flew nonstop from Ontario, CA to Portland, ME, a distance of 2258 NM (longer than Santa Barbara to Hilo). I built the rear seat aux. tanks for Damon's plane. He could carry approximately 105 gallons, IIRC, which gave a no wind range of ~3K NM when flying at the Carson speed or a bit higher. He landed with 26 gallons on board, with a tailwind, after 13 hours, at an average GS of about 170 kts. Damon had the tanks built because he was planning a round-the-world flight, but that's been indefinitely postponed. Since a COZY MKIV has larger strake tanks and a larger back seat, I'm sure tanks could be built that could carry more than enough fuel. One COZY MKIV had a bladder tank that could carry almost 100 gallons fabricated to fit in the back seat, but the owner never did his planned round the world flight, either. I'm sure you could have tanks built and installed, and find a ferry pilot, and then it would only cost you about 50% more than having it shipped - at least that was my experience.
  6. None of that is correct. About 1/2 of the Long-EZ's out there are using 320's. There are a few 360's (maybe 5%) and the rest are 235's (with a smattering of 290's and other random stuff thrown in there). Empty weights of the O-235 models tend to be 850 - 900 lb, and the O-360's tend to be 900 - 975. There are 1000 lb. LE's out there - generally with O-360's and loaded with other stuff (including a lot of fill). While I understand that the reference to F-16's is hyperbole, I regularly fly my COZY MKIV (essentially the same performance as an O-320 Long-EZ - maybe a bit less, depending) out of 2000 ft strips at Sea Level, when at 1600 - 1800 lb. GW. If you can get 120 HP from a 912, that should perform reasonably well - about like the 115 HP O-235. I'm not a fan of VS or CS props - there's just no need for the extra weight and complexity on a Long-EZ, just to save 200 ft. on the takeoff roll (and you'll give up speed on the top end). But it'll work. Not nearly as well as the 150/160 HP O-320, but like the O-235, as I said. I've inspected close to 40 or so different Long-EZ's (CI's or Pre-Buys). I've never seen one under 800 lb., much less even close to 700 lb. You're dreaming if you think you can build one that weighs 650 lb. Get it down to 750 - 800 lb. and you'll have done a hell of a job.
  7. I'd expect an E-Racer to go for a bit more than a Long-EZ with the same equipment and same quality. Is this Lynn Erickson's plane? If so, I'm told that it was very high quality. But without knowing the state of the engine, it could be worth anything from $25K to $60K. The panel, while full, is old, but if everything works, there may be no need to do anything to it. If the engine's pristine, relatively low time, and the plane's show quality (doubtful from the two pics, but you never know) it could be worth more. All depends. See: https://www.burnsideaerospace.com/pre-buy-examination-information for info on the services I provide. Phoenix is about a 2 hour flight from KTSP, and I've done numerous PB's in AZ.
  8. If you want static pitch stability, the front lifting surface on ANY aircraft must be at a higher AOA and be more highly loaded than the rear lifting surface. While there may be ways to modify the existing kite hydrofoils to have lower drag (which Is what I assume you're after) this rule cannot be broken and still have static pitch stability. So the simple answer to your question is "No, you can't have the same AOA on the front and rear lifting surfaces and still keep pitch stability".
  9. Just out of curiosity, who's project did you purchase?
  10. So the POH is very clear on the "as designed" limitations of a Varieze. The V/N diagram on page 22 shows an positive "G" limit of 5G, and a negative limit of -2G. Assuming that one built a VE today and used appropriate protection techniques for all the AL wing fittings, those would be the limitations, AT the MGW of 1050 lb. per the diagrams on page 26. Now, given the wing attach fitting corrosion issue, RAF lowered the limits to +2.5G and -1.5G, based on nothing other than "sh*t - we don't know what to do about this, but the wing attach fittings might be substantially weaker than planned". It was intended to be a temporary change while a fix was developed, but no fix was ever developed by RAF. There are a couple of folks that have figured out how to replace the fittings, and have done so, but it's a 40 - 80 hour job, so if you're paying someone to do it, it's a substantial portion of the cost of the airplane. And since there's no way to determine if there's corrosion without taking the fittings apart, well, it's a catch-22. Most planes are fine, but having seen 4 sets of corroded attach fittings that were in flying airplanes, to me, VE's are somewhat problematic and whenever I perform a Condition Inspection on one, I include a very clear note about the wing attach fittings being uninspectable and a complete unknown.
  11. There are a few COZY's flying with C/S props and a few LE's as well, along with a few Berkuts. Generally, I'm not a fan, due to the cost, complexity, maintenance needs, and weight. But they do a bit better on takeoff rolls, and if you're lucky, you don't give up much on the top end (although sometimes you do - depends on the make, model and tailoring to the airframe - some MFG's do a lot better than others). On a Defiant, with TWO props, that's a lot of added weight, but the ability to feather the prop (if the one you get HAS that ability) could be a safety feature in the case of an engine out - the Defiant climb rate, with two O-320's, fixed pitch props and one engine out is not great at anything other than sea level - the single engine service ceiling is not that high. But that's the case for all light twins - they suck, and the second engine is there to extend the glide, and not much else. There aren't many MFG's that make composite pusher C/S props...
  12. The VE, LE and COZY's all have a safety catch per plans.

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