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  1. Shepherd Thiel

    Pulling with a Honda CRF150R with optimized prop and ReDrive

    “There are old pilots, and there are bold pilots, but there are no old, bold pilots.”
  2. Shepherd Thiel

    Pulling with a Honda CRF150R with optimized prop and ReDrive

    Not in my mind, I know where I'm going. Besides I plan on running many hours on the ground. Mocking up stress/breakaway parts and doing destructive testing. Part of that will be engine mods, test stand run up and then break in, what I learn in the break in will determine my next TBO from...
  3. Shepherd Thiel

    Pulling with a Honda CRF150R with optimized prop and ReDrive

    As said maintenance schedule not a big change. Yes TBO is shorter than a 1/2 VW, but on the CRF-250 it is much simpler and less expensive, at least simpler than the original conversion of the CRF-250 engine. Much of the maintenance and ware on the CRFs is the trans a part I am removing. This...
  4. Shepherd Thiel

    Pulling with a Honda CRF150R with optimized prop and ReDrive

    I can't think of anyone who would want to fly a heated, enclosed cab Legal Eagle that can fly 5 hours on $10 worth of fuel... Especially if it's even less $ to build it than the original.
  5. Shepherd Thiel

    Pulling with a Honda CRF150R with optimized prop and ReDrive

    Your correct, the lower end (30hp) 1/2 VWs make around 150 lbs thrust and max speed at 63 or so. Many run supped up 1/2s (45hp) and make 250lbs or better thrust. They then calibrate (De-Tune) to a 63 mph cruse and let the engine loaf along making only 35hp of the rated power. The advantage is...
  6. Shepherd Thiel

    Pulling with a Honda CRF150R with optimized prop and ReDrive

    addaon, I plan on building my own version of a Legal Eagle Leonard Milholand's Better Half VW and Legal Eagel Ultralight! I'm more or less reverse engineering the entire aircraft bit by bit, looking at the 100s of others that people have built and adding the improvements those people have made...
  7. Shepherd Thiel

    Pulling with a Honda CRF150R with optimized prop and ReDrive

    I hear a lot of people who have flown both say the LE flys like a Piper Cub. The only other gripe I here is some of the 1/2VW's feel noes heavy. I'm making a slight change to the nose design of the Legal eagle. The nose will form a triangle from the pilot forward. Simpler, stronger and...
  8. Shepherd Thiel

    Pulling with a Honda CRF150R with optimized prop and ReDrive

    So the short of it? 140-150 LBs thrust is normal for a vanilla 1/2 VW on a Legal Eagle. So I could fly on a CRF150. I want to build an improved version of the Legal Eagle that takes many improvements from Sam Buchanan's Legal Eagle XL. I want to be able to fly with floats and I need...
  9. Shepherd Thiel

    Pulling with a Honda CRF150R with optimized prop and ReDrive

    Aaron, Thank you for the inquiry. For engine A a ratio of about 5.9:1 would yield about 155# static thrust with a 13 degree pitch. Maximum prop RPM would be 2100. For engine B a ratio of about 4.4:1 gives 220# thrust with 13 degree pitch blocks. Static RPM is 2500. 59"...
  10. Shepherd Thiel

    Pulling with a Honda CRF150R with optimized prop and ReDrive

    I sent an e-mail to Competition Aircraft They advertise figuring out the optimum prop for your engine if you have HP, RPM and ReDrive #s. Here is the E-Mail I have 2 engines and plan to make custom ratio belted redrives for both. Engine A=21.61hp@12,500rpm Engine B=35.8hp@11,000rpm I...
  11. Shepherd Thiel

    Pulling with a Honda CRF150R with optimized prop and ReDrive

    Than it will make a fun little air boat kit for a small flat bottom boat. I'm sure I'll think of something fun to do with it if I have to build it before I'm convinced it won't work.
  12. Shepherd Thiel

    Pulling with a Honda CRF150R with optimized prop and ReDrive

    I'm not turning the same prop, I'm turning a 58"dia 28"pitch 3 blade. It is more efficient at lower RPM. at 2800 rpm a known 1/2 vw is making 35-40 hp and turning a 58" 24" pitch 2 blade. Said prop works best at 3000 rpm. I used a 3 blade with more pitch for better thrust numbers at lowered...
  13. Shepherd Thiel

    Pulling with a Honda CRF150R with optimized prop and ReDrive

    Its a lot of cutting but the trans can be cut off and case ground/filed tell it looks pretty.
  14. Shepherd Thiel

    Pulling with a Honda CRF150R with optimized prop and ReDrive

    HP is a measure of force over time. A reduction drive would alter the force/time ratio. HP was just an easy measurement of force that would be as useful as torque numbers. I would waste a lot spinning a little prop 10000+ RPM A larger prop turning slower is more efficient. I started by...
  15. Shepherd Thiel

    Pulling with a Honda CRF150R with optimized prop and ReDrive

    Reduction Drive VW from Great Plains Aircraft! On a 2180cc engine with a 1.6:1 drive and a 72 inch prop, you will see about 350 lbs. of thrust. On a 2.0:1 drive and an 84 inch prop will pull about 450 lbs. of thrust. You get the idea! (A direct drive VW with a 62 inch prop will pull about...
  16. Shepherd Thiel

    Pulling with a Honda CRF150R with optimized prop and ReDrive

    My numbers are all based on factory stock engine specs, redrive calculations and prop thrust calc. Factors 5% power loss due to ReDrive + 15lbs (Should be less than 3%) 58"/28" 3 Blade: 3.01hp@1000rpm=43.95lb/[email protected](Stall) *Also engine idle speed*...
  17. Me

    Me

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