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  1. L

    Revisting thicker skins for laminar flow

    Yes, very helpful, the consensus is composites are superior( and true for the most part), but factory composite sailplane planes rarely meet the standard for laminar flow without some work. These factories have years of experience and struggle with this standard. What factual data can be found...
  2. L

    Revisting thicker skins for laminar flow

    Thanks for all of the input, very helpful.
  3. L

    Revisting thicker skins for laminar flow

    .004 "waviness" over 2 inches was the gold standard in the flight tests. .006 appears to be a common number for fiberglass planes. A few were in the .004 range, but almost all regardless of construction method needed work to achieve .004.
  4. L

    Revisting thicker skins for laminar flow

    Understanding laminar flow is not the issue, getting it is the issue. What I was looking for was the best-documented method for getting close to laminar flow if aluminum was used. Aside from snide opinions, the best data I could find was from Dick Johnson's sailplane tests. He always noted the...
  5. L

    Direct Drive Honda/B&S limits

    Spinner diameter is already 17 inches. Had not considered flipping the engine. Lots of good points to consider.
  6. L

    Hi, Thanks for your post. Can your reduction drive be used on smaller engines? Can a custom...

    Hi, Thanks for your post. Can your reduction drive be used on smaller engines? Can a custom ratio be ordered? It would be ideal if I could use one of your units. I looked hard at your three-cylinder, but too much HP for a glider project. Thanks, Lee
  7. L

    Direct Drive Honda/B&S limits

    Thank you for the offer, just emailed Ace to try and get one made to keep the engine centered due the low shaft position.
  8. L

    Direct Drive Honda/B&S limits

    Excellent point as I would prefer direct drive, but redrive may allow a larger prop with a little less risk. Redrive also allow engine position to be more centered.
  9. L

    Direct Drive Honda/B&S limits

    Armilite was right, redrive is needed even with the lightest props. MOI for the flywheel was almost identical to the tiny and lightweight props on the FES system. So even the smallest props are likely too much for the engines "as is".
  10. L

    Revisting thicker skins for laminar flow

    Is it fair to say: A preformed aluminum wing skin greater than .05 thickness with an underlying structure that keeps the wing from deforming under load is the preferred approach to this issue?
  11. L

    Revisting thicker skins for laminar flow

    Familiar with HP-18, but not the SX-300, will check it out. Any other examples or methods?
  12. L

    Revisting thicker skins for laminar flow

    Found an older post on this subject, hence the subject line Question: Are laminar flow wings/fuselage always impossible with aluminum construction regardless of construction methods? Does no construction method exist to solve this issue? Prebent/molded thicker wing skins, aluminum over foam or...
  13. L

    Direct Drive Honda/B&S limits

    Thanks all. Will start with Billski's advice and model in Solidworks and then model against propellers to see what happens. Honda price is almost identical to Kohler and B&S for same HP. All are around $2k.
  14. L

    Direct Drive Honda/B&S limits

    $1999 according to local dealer
  15. L

    Direct Drive Honda/B&S limits

    Motor glider with tractor engine. Trying to work with the Honda iGX 800 at 28 hp. 28 hp is a pretty common hp in small motor gliders. Prop dimensions are be limited due to ground clearance. 42 to 44 inches maximum. Trying to find an EFI four stroke that will not require major reworking with...
  16. L

    Direct Drive Honda/B&S limits

    I was rationalizing this approach due to the Onan use for years in the Quickie and seeing the DA-11 at an airshow in Texas in the 1990's. Onan was underpowered but seemed to work without major issues.
  17. L

    Direct Drive Honda/B&S limits

    Thanks for the input. Am I correct that calculating numbers for the flywheel is the only potentially close number? For example, if flywheel weighs 15 lbs and is rated for 3,600 rpm, a number can be estimated or calculated. Then prop can be estimated, if prop forces are smaller than flywheel...
  18. L

    Direct Drive Honda/B&S limits

    I have been reading the Briggs conversion messages. I understand moment of inertia issues, twisting and bending to some extent, but what is the best way to arrive at a factual answer? For example, X industrial engine can be used as a direct drive if the propeller weight is less than x and or...
  19. L

    Hi Tom, Are you still working on the scale Merlin? Would you mind answering a few questions on...

    Hi Tom, Are you still working on the scale Merlin? Would you mind answering a few questions on this project? Thanks, Lee
  20. L

    Hi Ely, Are you still working on the Merlin? Wanted to ask a few questions about this project...

    Hi Ely, Are you still working on the Merlin? Wanted to ask a few questions about this project. Could the same engine be scaled up a little? Thanks, Lee
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