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  1. danmoser

    Aeropoxy 6228

    The adhesive choice isn't your problem. The problem is that sanding and "cleaning" the aluminum surface is NOT ADEQUATE preparation for bonding. Bond failures are almost always adhesion failures on the aluminum surface, not cohesive failures within the adhesive layer itself. You need to do a...
  2. danmoser

    Wing rib to spar adhesive/epoxy

    Several epoxy adhesives like those mentioned will do fine, but much more important is properly treating the surface of the aluminum prior to applying adhesive. DO NOT just sand and degrease the aluminum surface.. that ain't good enough. You can't avoid an oxide layer, so the objective is to have...
  3. danmoser

    all metal ultralight

    Jany, There is also the Mitchell A-10 ultralight, which is basically an all-metal version of the wooden B-10. Wings skinned in sheet Aluminum, foldable at mid-span joint for trailering. Hundreds were made, though you don't see them around much anymore. They were reportedly pushing up against...
  4. danmoser

    What do you think about "e-soaring"?

    No, I do not know the specific thrust of whisper fan.. They make a big splash in media with lots of claims, but no test data. This ought to make everyone very skeptical. 140cm 3-blade E-prop calculation: 18.2 kgf (40 lbf) thrust at 56 kph (35 mph) turning at 1400 RPM, using 4.1 kW (5.5 hp)...
  5. danmoser

    What do you think about "e-soaring"?

    Henryk, Ducted fans are cool... I've actually designed and built some. However, they are not a good fit for the K-wing ultralight, especially if battery electric powered. Propulsive efficiency is relatively low with reasonably sized ducted fans, which is not compatible with the need to squeeze...
  6. danmoser

    What do you think about "e-soaring"?

    I just bought one, with plans to adapt it to my Kasperwing. .. will report back here when installed & tested. Happy New Year! ;)
  7. danmoser

    Why so few UFO's are seen by pilots

    My take on why pilots see very few UFOs: Pilots are simply much better at identifying flying objects than your average Earth-bound sky gawker. My reaction to the vast majority of "What is this?" UFO videos: "That's a (bird, plane, or balloon), you numbskull!" ;)
  8. danmoser

    DC 3 wing planform

    Brilliant design .. adopted the world over.. tie me kangaroo down, sport!.. ;)
  9. danmoser

    Flying wing as cheap and simple option for basic fun flying.

    I was fortunate to have flown with Hall's Quadraplane in 1978-79. It was developed by Larry Hall from Morgan, Utah. The same Hall who helped invent the Superfloater, and makes the Hall wind meter and Hall hang glider wheels. Larry is a great guy .. generous, clever, and hard-working. It's...
  10. danmoser

    Another Electric 103 Dreamer

    I agree that electric is most suitable for the most efficient aircraft with current technology, but the current power-to-weight ratio can be as good or even better than Internal Combustion Engines. It's the energy-to-weight ratio that is lacking, resulting in limited range and duration. By using...
  11. danmoser

    Sold 2A042 engine, Teledyne mil. surplus, flown on Mini-Max - SOLD

    The 2A042 engine I had for sale has been sold. It appears this thread has turned into an informational resource, moreso than just a classified ad. So maybe it ought to remain on the forum somewhere? admins?
  12. danmoser

    Flying wing as cheap and simple option for basic fun flying.

    The Frankfort Cinema 2-place glider built and flown successfully back in the 40s used two small engines mounted on the struts. This could be a plausible option for motorizing the Marske Monach tailless glider.. Thrust vectors could be aligned in-plane with the vertical CG position, and the prop...
  13. danmoser

    Sold 2A042 engine, Teledyne mil. surplus, flown on Mini-Max - SOLD

    Lynn, Sorry I didn't see your question sooner. I don't have Kevin's prop or know which one he used. Pictures of what I have attached.
  14. danmoser

    Crashes in the News - Thread

    Mid-air collision between Cessna 172 and Sonex Xenos motorglider near Longmont, Colorado, USA this morning. Initial reports of 3 fatalities were updated to 4 dead at the scene.. What a sad event.. see & avoid, people! :(...
  15. danmoser

    What do you think about "e-soaring"?

    After a frustrating search for a BMS that matches a good battery pack, the "build your own BMS" option is something I'd like to explore. Does anyone know of a good source for BMS design recommendations, guidelines, best fabrication practices, things to watch out for? I've got a basic knowledge...
  16. danmoser

    6013-T4 sheet 0.032" thick aluminum, strong as 2024, weldable.

    Sourced from Falcon Aerospace in Florida. IIRC, there is a large minimum order and few thickness choices. https://www.falconaerospace.com/portfolio-item/aluminum/
  17. danmoser

    6013-T4 sheet 0.032" thick aluminum, strong as 2024, weldable.

    Probably somewhat.. sorry to be non-specific. I've been told by aluminum suppliers that if you leave -T4 aluminum out in the hot summer sun for years, it can become less workable, though probably still more ductile than -T6. It's a time-temperature variable range of properties These -T4 sheets...
  18. danmoser

    6013-T4 sheet 0.032" thick aluminum, strong as 2024, weldable.

    True, but these sheets are supplied in the -T4 temper which means they have already been solution treated, quenched, and naturally aged. Artificial aging from relatively soft naturally aged -T4 temper to the fully hard -T6 temper only requires a 350 F oven for a few hours. However, if you heat...
  19. danmoser

    Sold 2A042 engine, Teledyne mil. surplus, flown on Mini-Max - SOLD

    Thank you, it is 801 area code. Mosi progress is slow.. I'll post in an appropriate thread when there's something to report.
  20. danmoser

    6013-T4 sheet 0.032" thick aluminum, strong as 2024, weldable.

    The 0.032" thick 6013-T4 sheet material is still available. Price reduced to $250 for all 4 sheets, 48"x72". I also have 3 cylinders rolled from these same sheets, 48" long x 20" diameter. $150 for those. Call Dan at (801) 502-4379 if you have any questions.
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