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  1. U

    Engine vibrations

    I had a rough running problem with my O-200 when I changed the MA3-SPA 2 piece venturi. The AD note says to replace the fuel nozzle too which solved the problem.
  2. U

    Franklin Sport 4 engine

    True, I wouldn't go with a Franklin engine unless they started building parts and engines again. Maybe an O-200 or Lycoming O-235 with light wt starter and alternator. I've looked at the Corvair conversion too.
  3. U

    Franklin Sport 4 engine

    This photo was found in a 1970 Sport Flying magazine showing the kit built Franklin Sport 4 engine for $1300. For homebuilts only.
  4. U

    Cygnet news

  5. U

    Designing My Dream Airplane - preliminary concept

    Another consideration when choosing a tailwheel vs nosewheel is two things. An incident of a nose over in a tailwheel airplane can cause a prop strike requiring a complete teardown of the engine and prop replacement. The other possibility is the limited view over the nose can produce a prop...
  6. U

    Franklin Sport 4 engine

    I got my PPL in 1965, Commercial in 1970, A&P in 1974, IA in 2009, and worked 38 years for a major airline. Member of EAA since 1969, owned 7 certified airplanes. Now in my 80's, for my last project I'm working on an MFI-9HB (homebuilt version of a Bolkow Jr). As far as interest in homebuilts...
  7. U

    Franklin Sport 4 engine

    If you only worked on certified airplanes you may not be aware of Ellison throttle body injectors, light weight starters, electronic mags, alternators and permanent magnet generators that weight only 3 pounds and put out 30 amps. These all reduce weight by at least 20 lbs. some available 20...
  8. U

    Franklin Sport 4 engine

    Jabiru 3300, 120hp Generation 4 engines are built on order, not waiting to be sold on the shelf for about $20,000. They've been in business for 34 years and have a business model that apparently works. Not a "one man show".
  9. U

    Franklin Sport 4 engine

    No but that's how they were made in the pre CNC days!
  10. U

    Franklin Sport 4 engine

    I inquired about the price from Continental and the O-200 D4B was quoted to me for $55,800 sold through Air Power Inc, Arlington TX.
  11. U

    Franklin Sport 4 engine

    No, it would be cheaper to buy an new Continental O-200-D4B from Air Power, Inc in Arlington, TX. They quoted me $55,800
  12. U

    Franklin Sport 4 engine

    New technology manufacturing is now done using CNC machines to keep labor costs down.
  13. U

    Franklin Sport 4 engine

    True and how about the Jabiru 3300?
  14. U

    Franklin Sport 4 engine

    Weight can be greatly reduced using light weight starters, alternators, mags and carburetors. A couple of Kitfox airplanes in my area use Franklins and they are designed for Rotax engines!
  15. U

    Franklin Sport 4 engine

    I find it hard to believe the Franklin Sport 4 engine is not being produced as a kit of engine parts to be assembled for home built airplane builders or a shop the way it was 50 years ago. No FAA TC is needed. The Franklin Sport 4 could be upgraded to solid state ignition, automotive spark...
  16. U

    My Safety Concerns About Bubble Canopies

    Check out the pictures of the Cygnet design on line with it's 2 clamshell doors hinged in the cockpit center support. The hinges on each side can have a quick release hinge pin. I'm using that design on a homebuilt MFI-9HB. The Cygnet uses what appears to be a flat wrap Lexan thin enough to...
  17. U

    Cygnet news

    Bubble canopies can be next to impossible to exit in a turnover situation. I know of one RV-6 that turned over and she had to be rescued by airport personnel. I'm working on a MFI-9HB, a homebuilt Bolkow Jr and am beginning work on the canopy structure using Cygnet design features. The Cygnet...
  18. U

    Cygnet news

    I like the Cygnet canopy clamshell canopy and was wondering if it is made of Lexan which is very flexible and therefore a flap wrap. (no compound curves) Benefits are low cost and easier emergency egress. Anyone have info on this?
  19. U

    My Safety Concerns About Bubble Canopies

    Ron Wanttaja publishes accident statistics in depth so would be interesting to hear his opinion on bubble canopy safety.
  20. U

    My Safety Concerns About Bubble Canopies

    Very interesting discussion on canopies that I've thought about for a long time but never heard it discussed in depth. Another factor is that canopies made from Lexan when drilled will not crack and in fact can be bent 90 degrees without breaking, therefore almost impossible to exit in a...
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