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Type: Posts; User: Bob H

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  1. Replies
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    I assume you separated the disc from the wheel...

    I assume you separated the disc from the wheel hub on back side? Matcos usually have 3 screws safety wired to disc that have to come out.
  2. Thread: Honeycomb

    by Bob H
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    I'm not directly familiar with the specific BD4...

    I'm not directly familiar with the specific BD4 honeycomb core but for most sandwich core information, you can get started with Hexcel Honeycomb online.
    The two basic core materials are Aramid paper...
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    I would add that wing loading makes a difference...

    I would add that wing loading makes a difference in Xcntry flying because a low loading will "feel" turbulence and really tire a pilot quickly.
    I fly a Pulsar XP with 12psf loading and a Zenith 701...
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    If engine was not running and any impact loading...

    If engine was not running and any impact loading from prop would be in bending of flange, I would not expect crank to have damage. Certainly you should indicate flange and assure it is within normal...
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    P-51 Ride for WWII Bombardier

    We had a speaker at our Pilots Assn meeting, Pete Johnson, who was a B-17 bombardier over Germany in 1944 and gave much praise to the P-51 escourts that kept the ME-109s away on his missions....
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    Gary Sobek, please email me. Bob hartunian...

    Gary Sobek, please email me.
    Bob hartunian
    bobh5@earthlink.net
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    In the bonding business, surface preparation is...

    In the bonding business, surface preparation is the most important factor for good adherence. For non-metallic surfaces like epoxy laminates, you would like both mechanical abrasion and chemical...
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    Most polymer laminating systems will eventually...

    Most polymer laminating systems will eventually breakdown in presence of ethanol and that includes both epoxies and vinyl esters. The resistance to breakdown is in the degree of crosslinking of the...
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    I used to do adhesive bonding for Boeing. What...

    I used to do adhesive bonding for Boeing. What tests did you conduct for adhesive evaluation? Are bonds on wood or metal or composites?
    What surface prep was used? It all makes a difference.
    Bob H
  10. Structurally, you want to determine condition of...

    Structurally, you want to determine condition of glass relative to UV exposure or weathering. If plane was exposed to elements/sunlight, the resin of the laminate can be degraded. Usually shows up as...
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    In composite materials, including fiberglass, you...

    In composite materials, including fiberglass, you prefer not to have radially expanding fasteners because they will break fibers at hole periphery and reduce bearing strength. If the application is...
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    In the airplane business, there are two types of...

    In the airplane business, there are two types of structure, primary and secondary. If primary structure fails, the plane crashes (wing spar). If secondary structure fails, the plane should make it...
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    The "equivalent" term in the label makes all the...

    The "equivalent" term in the label makes all the difference. The 42J are not Cherry products.
    What is your end use for these?
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    I checked the Cherry data sheet for the CCP-42...

    I checked the Cherry data sheet for the CCP-42 pull rivets and did not find any letter designation for a 42J.
    The CCP-42 was a SS rivet body, a SS mandrel, a protruding head, a 4/32" dia and a 2/16"...
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    Some consideration of engine choices should...

    Some consideration of engine choices should include safe landing risk if engine stops. I fly in San Bernardino mountains out of Big Bear where there is no place to put down if engine fails.
    If you...
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    I don't believe Rotax makes the 503 anymore. You...

    I don't believe Rotax makes the 503 anymore. You would have to find a used one and assure it's airworthy.
    They required major servicing every 300 hrs or so.
  17. I spent many years working on composite...

    I spent many years working on composite manufacturing for aircraft. I didn't see any details of the actual composite structural scheme you used; skin/stiffener, sandwich. Or any fiber/matrix choice....
  18. Christos; Why did you choose 6.00 X 6 tires for...

    Christos;
    Why did you choose 6.00 X 6 tires for a light plane? I would assume 5.00 X 5 would be more than sufficient for normal operations and would provide less weight and frontal area.
  19. I built a Pulsar XP and a Zenith 701. Big...

    I built a Pulsar XP and a Zenith 701. Big difference in parts count. The composite Pulsar fuselage is just 2 pieces bonded and glassed together. The aluminum Zenith has several dozen detailed pieces...
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    I have a 701 and did a fuel flow test with tail...

    I have a 701 and did a fuel flow test with tail as low as possible. Fuel did not flow as wings and engine were at same height. So I installed a Facet pump for $35 with the free flow feature just in...
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    Sure. Contact me at bobh5@earthlink.net.

    Sure. Contact me at bobh5@earthlink.net.
  22. Thread: lancair 320

    by Bob H
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    I'm in Big Bear and built a Piulsar XP composite...

    I'm in Big Bear and built a Piulsar XP composite experimental. Also retired from Boeing as composites engineering specialist.
    I could fly down to Brackett and discuss composite fabrication details...
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    Metals corrode according to the galvanic series....

    Metals corrode according to the galvanic series. Those high on the scale are most reactive when coupled with materials lower on the list. Magnesium is very high and gold is lowest. All other...
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    All it takes is the onset of corrosion and it...

    All it takes is the onset of corrosion and it will propagate by itself. Trying to stop it can take much effort and expense, I'd opt for preventing it in the first place.
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    Two schools of thought on corrosion protection....

    Two schools of thought on corrosion protection. One is that all faying surfaces will have moisture showing up by capillary action so you had better provide protection by priming the members before...
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