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  1. planebuilder

    Robin Ultralight

    Same here Mark, don't be a stranger, I know where the airport is and what your flying!!! I like that picture, with a prop flange extension, it looks like I can craft a radial type cowl around her.
  2. planebuilder

    Robin Ultralight

    thats what I'm going to do on the prototype, I will make them full with on the palns
  3. planebuilder

    Robin Ultralight

    It was, in fact thats where I was heading, to the DFW area. I have installed the new landing gear and the new wheel brakes. Since I have the fabric off the fuselage, I am also going to correct some covering mistakes. I used standard head fasteners for the seat belt attachment and the roll over...
  4. planebuilder

    Robin Ultralight

    Here is a start Luciole.co.uk
  5. planebuilder

    Robin Ultralight

    So Michel Colomban has cut away most of the flywheel weight and mounts the prop to the flywheel side. One huge advantage of this configuration is the crank does not see any of the torsional vibrations from the prop. The last report I have read is he now has over 1400 hours on this combination. I...
  6. planebuilder

    Robin Ultralight

    No its really not, but 550 hours is a **** good start. that's already 550 time more reliable than a 2 stroke!!
  7. planebuilder

    Robin Ultralight

    its possible, but it might be hollow for the oil
  8. planebuilder

    Robin Ultralight

    He has maintained the same polar moment of inertia as the original flywheel. we are always on our own when we fly!! Thats whe its called experimental aviation.
  9. planebuilder

    Robin Ultralight

    Yes as a matter of fact I have a letter from a guy in the Cech Republic, here is his letter and pictures. The gentlemans name is Juraj Tinka Dear Sir, Greetings from Czech republic. I am ultralight pilot and builder too. My first project was SD-1 from kit. Second project was replica of...
  10. planebuilder

    Robin Ultralight

    well let the games begin!! There are so many performance parts available!! I want to run dead stock, but a 7lb weight savings with an aluminum flywheel is a tough one to pass up. I'm going to get one ASAP. Here is the engine before any mods. Tonight I will weigh it and see what the stock...
  11. planebuilder

    Robin Ultralight

    Ben, I joined the Small engines forum on Yahoo, I posted the question there asking if anyone knew where to get a lightweight flywheel. Do you have any ideas?
  12. planebuilder

    Robin Ultralight

    Ok Ben, your on!! I am going to install the Vanguard in a direct drive configuration and see what it does. I can always install a reduction drive later. The only thing I'm out is about 4 hours to carve a new prop. I found a spread sheet by Gordon Arnaut on the small engines forum I joined. He is...
  13. planebuilder

    Robin Ultralight

    yes, direct drive is lighter and cheaper, but the thrust gain far outweighs the disadvantages. It looks like I can get a decent redrive for $600. In my mind thats acceptable. I started out flying hang gliders with a 10 hp power pack called a Soarmaster. Ever since, I have been a huge fan of...
  14. planebuilder

    Robin Ultralight

    Well I might be able to fly on a stock 23 hp engine, but I like 35 horse more!!! Besides, after the balancing and blueprinting, the engine will be far more reliable. I have another idea for this engine after I fly it on my Robin. Yes that's the place I talked to and yes, we are not supposed...
  15. planebuilder

    Robin Ultralight

    Robin Ultralight landing gear redesign I updated my blog Robin Ultralight to show the latest update for my new gear redesign. A friend of mine bought a Tiafun Motor glider that had a nose gear collapse . He bought id off the AIG insurance web site. He lives in New Jersey and if he can get his...
  16. planebuilder

    Robin Ultralight

    The race modifications are for increased HP and reliability. The forged Rods and Pistons and the roller cam are good examples of reliability. Performance Vee's came highly recommended. They actually build a drag race version of this engine that kicks out 70 hp@ 10,000 rpm. In operation, the 35...
  17. planebuilder

    Robin Ultralight

    You can always use a 2 stroke.
  18. planebuilder

    Robin Ultralight

    Forgot to mention, the engine class changes above 23 hp for the stock engine. The higher HP engines weigh a lot more
  19. planebuilder

    Robin Ultralight

    Yep, thats the engine, but not the one I would fly. There is a company in North Carolina called Performance Vee's who totally rebuild the engine. They replace the pistons with higher compression forged pistons, the rods are replaced with forged rods. The carb is replaced and the cam is replaced...
  20. planebuilder

    Robin Ultralight

    so picture this, I was was hanging the engine on my original cad model and this new engine works perfectly with the basic cowl lines and the spinner. So most of my work can be salvaged, but I will need a new cowl mold. BUT!! I laid out a radial cowl and because the prop center line is offset...
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