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  1. jazzenjohn

    Another Electric 103 Dreamer

    Electric aircraft has a huge power to weight disadvantage so it seems to me that it should develop from the most efficient craft towards the least efficient.
  2. jazzenjohn

    Has anyone built a Gyrobee lately?

    After rereading the thread, I just want to say the 503 is a fine engine, well suited for an ultralight gyro. Not sure if my post represented that fact. The jump head is very difficult. The sky wheels are , in my opinion unnecessarily heavy. They are well regarded, but when building ultralight...
  3. jazzenjohn

    Prerotator

    Can you use a recoil starter, sure, but it will be terribly underpowered. The best of us might be able to muster 300 watts, thats optimistic, and you wont get you many rrpms. If the blades are bensens or one of the easily hand start able blades it will suffice. Yes, I was at the Barnstormers...
  4. jazzenjohn

    New rotorcraft concepts

    The nature of tractors makes centerline thrust easier to do and a problematic high thrustline difficult. That said, tractors basically suck. You can derive this by the fact that few people have them but anyone could if they really wanted them, you can derive this by the bulk of people that have...
  5. jazzenjohn

    Hornet max engine size.....why ???

    You could build it with a slightly bigger engine but weight will become a problem. There aren't too many choices at the same weight and power, maybe mz202 and hirth? A new 50 hp minari is out but it doesn't have much of a track record yet.
  6. jazzenjohn

    Prerotator

    23 foot diameter Dragon Wings so about 42 pounds. 3000 watt motor.
  7. jazzenjohn

    UN hails end of poisonous leaded gas use in cars worldwide

    If you look at the cdc data on lead in children in Illinois at 72 months old, there were 30,000 children tested above 10 ug/dl . None were even alive when leaded gas was being used. by 2014 it had dropped to 1600. Good, but it doesn't track with less use of aviation fuel AT ALL. Obviously there...
  8. jazzenjohn

    UN hails end of poisonous leaded gas use in cars worldwide

    I think if you closely examine the reports, they were almost certainly commissioned by people that wanted to close the airport and the conclusion was predetermined by the people who paid for it. I think if you closely examine them, they will also completely fail to take into account all the...
  9. jazzenjohn

    UN hails end of poisonous leaded gas use in cars worldwide

    The whole leaded gas thing was BS from the start. They found elevated lead levels especially in city kids and some dullard decided it was tetra ethyl lead in gas. They banned it and guess what, didn't make anywhere close to the difference it should have had it been the culprit in the first...
  10. jazzenjohn

    Prerotator

    I'm using a brushless outrunner motor for my prerotator. It's smaller and weighs less, but I don't get quite as fast a prerotation as the best gopeds. 185 vs 220 RRPM or so. I could go with a bigger motor but there are several other considerations that go along with the higher RRPM's.
  11. jazzenjohn

    Prerotator

    Most people I know that went with a engine for a prerotator used a high performance scooter motor. You can get them at Daves Discount Motors. For some good video/pics, look up the superfly gyro here: or the dragonfly gyro here: The Dragonfly Gyrocopter
  12. jazzenjohn

    Has anyone built a Gyrobee lately?

    There are exemptions for parachutes and floats that change that number.
  13. jazzenjohn

    Has anyone built a Gyrobee lately?

    The prop is too small. You'd want at minimum 60" and 65"+ would be better. 2-3 blades are enough at the diameters I suggest. I would strongly encourage you to make a standard gyro first before attempting a vastly more difficult jump take off gyro. Making a jump T/O head and replacing the one you...
  14. jazzenjohn

    Has anyone built a Gyrobee lately?

    I'm pretty much going to give you the same questions and advice here or on the Rotary Forum. Rotary-wing Ultralight Aircraft Check post 18 for some of the Gyro's I've built and flown.
  15. jazzenjohn

    Has anyone built a Gyrobee lately?

    I wouldn't expect the bee to become pitch divergent unless you used a very small tail or had the angle of incidence set wrong. Gyro tails generally should be 0 to -3 degrees nose down. There are plenty of ways to make a Bee lighter. Blade choice is important. The 503 is a great choice, but the...
  16. jazzenjohn

    Just a gyro sketch - not even serious

    There are a few other events you could get a good look at gyros if you want. The nearest one to you would be the twice a year Carolina Barnstormers events. They just had one a couple weeks ago ( I went to it myself) In fact, it was going on the day of your post! They have another in October...
  17. jazzenjohn

    Just a gyro sketch - not even serious

    I'm curious as to whether this tractor gyro ever flew and if so how well?
  18. jazzenjohn

    Chip is making progress with the Merlin Lite

    Hence the winky emoji Jedi.
  19. jazzenjohn

    Chip is making progress with the Merlin Lite

    My ultralight has a considerably higher aspect ratio wing than the Merlin Chip, my span is 23' and my wing chord is a mere 7" ....😉 My comment was merely to suggest to work hard on the weight and not worry too much about the max speed limitation. That can be fixed easily later. Also, nothing in...
  20. jazzenjohn

    Chip is making progress with the Merlin Lite

    The only ultralight plane I'm aware of that ran afoul of the speed restriction was the Sadler Vampire. It flew considerably faster than allowed.
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