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  1. S

    part 103 electric motor battery allowance?

    I was at the 2022 LSA Expo in Illinois. After one of the presentations Dan Johnson was answering questions from those of us who stayed after. The subject of part 103 and batteries came up. He recounted a story of a meeting he was in with some ultralight folks and an FAA rep. They started...
  2. S

    Current US state of pilot training (midwestern perspective)

    The Sling Academy website is advertising PPL training in their SLSA fleet here in the US...
  3. S

    Any opinions on best color?

    I saw this at a fly in this past summer. Pretty high visibility.
  4. S

    BMW motorcycle engine for a plane?

    I know that this is an old thread, but I thought I should add that Dave Hertner of Fisher Flying Products announced in his April 4, 2022 YouTube video that they are now a distributor of the "Take Off" BMW conversion engines: The announcement is about 40 sec into the video.
  5. S

    Tie 'em down!

    What do folks here recommend for portable tie downs? Some kind of auger maybe?
  6. S

    SnS -:- 21 | Q&A

    Here are the corrected templates that I made. Let me know if you have any questions.
  7. S

    SnS -:- 21 | Q&A

    From what I have read, the Guppy airfoil is based on the Grant X-10, which is a model aircraft airfoil. After some research I was able to download a copy of C. H. Grant's book (Model airplane design and theory of flight) and get the coordinates for it: ABSCISSAS* OVER CHORD LINE UNDER CHORD...
  8. S

    spec list of efficient light planes

    The original Sorrell SNS-2 Guppy should meet the criteria. It was designed to fly on an 18 hp engine. Sorrell SNS-2 Guppy Empty weight 330 HP 18 Max gross 575 Wing span 21' 3" Wing area 129 Stall speed 30 Cruise speed 65 Vne 90 L/D 12/1 Rate of climb 300 Length 15' 5"
  9. S

    Anyone have any recommendations for a 15 hp engine under $1000?

    To answer the original question, here is an engine that is over 15 HP and costs less than $1000: https://www.harborfreight.com/22-hp-670cc-v-twin-horizontal-shaft-gas-engine-epa-61614.html It has been discussed some here but folks are leary of it because: 1. At 110 lbs it's a bit heavy 2. The...
  10. S

    Human Powered Flight

    As I recall, the Gossamer Albatross MacReady's second plane, designed to fly across the English Channel, used a carbon fiber wing spar and was 20 lbs lighter (50 lbs vs 70).
  11. S

    dual mechanical brake lever?

    There's a guy in here in Michigan with a Kolb Firefly that he set up with a brake system like what you are describing. Here's a link to the his Youtube video: He starts showing the brake system at 7:00 and a close up of the split brake handle at 7:30. Screen cap: Parts of it are custom...
  12. S

    Facing bit with pilot?

    Well, I don't weld, but here is how I would approach the problem. I'd make an aluminum disk by by using a bi-metal hole saw on a piece of 0.25" plate, this has the added benefit of leaving a 0.25" hole in the center of the disk. Then drill and tap the disk from the edge on opposite sides (6-32...
  13. S

    Usable single-seater on 24 hp?

    The numbers in the OP are very similar to the Sorrell Guppy, which originally flew with an 18 HP golf cart engine. However the more I read about it I have come to suspect it was putting out more than 18 HP. I think that the switch to dual carbs upped the power output a bit, probably into the...
  14. S

    Printing Plans

    Or, if you have way more time than money; You can print a PDF file in poster mode with cut marks and then literally cut and paste it together.
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    Flying Flea PIREPS

    I'm currently researching a possible HM360 build and had the opportunity to meet with an HM293 owner this past summer. He said that he did not notice much lag between yaw and roll and it felt fairly normal to him. He owned other light aircraft of the tube and fabric variety and was pretty...
  16. S

    Flea style "Piojo Flying MiniBike"

    It's interesting to note that in a 1971 update to the HM 360 plans, they recommend moving the front wing main spar 4 cm to the rear to better balance control forces. Previously the front and rear wing spar location were the same distance from their respective leading edges.
  17. S

    Flea style "Piojo Flying MiniBike"

    Most Fleas have a series of detents or notches on the control column and a bungee cord that hooks into them. "Trim" is adjusted by moving the bungee up or down the the control column. I've seen this on Balerits and such a mechanism is described in the HM 360/380 plan book.
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