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  1. H

    Distributed Electric Propulsion

    CNG is not viable now because the pumping costs are very high for home pumping stations ($2-6.5/gallon just to pump it and about $1/gallon for the fuel without road tax.).and the number of stations are few and far between. The tanks don't serve an engine function and therefore are dead weight...
  2. H

    Distributed Electric Propulsion

    Henry, This thread is DEP, not a gun engine. I don't know much about it. I am reading the patents. Start a thread, state what you think and then I will comment. If it works as it claims to 4x the fuel economy of a car, it would be great. 13% is about average for a car according to GM...
  3. H

    4 stroke snowmobile engines

    Does anybody know about 4 stroke snowmobile engines? Most snowmobiles use 2 stroke Rotax engines similar to the 582. Any thoughts on 2 piston 4 stroke snowmobile engines for airplanes? Has anybody converted one for airplane use? Holden
  4. H

    VTOL and the Silicon Valley Connection

    No discussion about flying car is a wasteland. All is bliss, sky is blue, freedom ...
  5. H

    VTOL and the Silicon Valley Connection

    Cheapracer, Ready get set,,, give us your rant about flying cars. I am letting you tell me... you have the floor... Holden
  6. H

    Two cylinder engines

    Thanks, that tells a lot about these engines. By pulling the power back the fuel flow/hp can double... The Hirth engines seem to be much better in the flows. Holden
  7. H

    Distributed Electric Propulsion

    henry, Sure, when a battery is up to the mission and can charge as fast as filling a tank with gasoline. Time is money and waiting around for 8 hours to charge a battery is not viable. A GM Volt car is around 60% efficient highway and 30% city from the plug. And the plug is 30% for a total...
  8. H

    Distributed Electric Propulsion

    Henry, I am not using electric motors...
  9. H

    Distributed Electric Propulsion

    BMCJ, Gallon of electrons...:roll: factor 3412 BTU/kw-hr. Decide what a gallon of gasoline is ... 115,000 BTU (high heat ... non condensing) or 125,000 (1/8 of decatherm) (low heating value...to ambient temp condensed vapor). 115,000/3412=33.7 kw-hr.... or 125,000/3412 = 36.6 kw-hr. I...
  10. H

    Distributed Electric Propulsion

    Henry, This thread got me thinking and I changed a lot of the design. Much better than before. Very different than what the NASA guy proposes however. Holden
  11. H

    POLL: Homebuilding does not belong in hangars - I'VE COMMENTED

    I wonder why a city/county would shorten the lease times from 99 years...40 years...30 years...20 years...and at my local place .... 30 days? Could it be they want to sell the airport off to some developer? Hmmm. Or maybe they just like doing leases each year so they can crank the rent rate...
  12. H

    POLL: Homebuilding does not belong in hangars - I'VE COMMENTED

    Why would you want to invest in a hangar on government property if you did not absolutely have to? The leases usually have a short notice to vacate. 30 days at my local "air" port. Try pulling down a nice hangar and moving the concrete floor in 30 days...not fun. Where do you store the hangar...
  13. H

    FAA Says Hangars No Place For Homebuilders

    Maybe the FAA thinks that GA will soon be having a massive upturn in demand after they listened to some other government transportation report. If demand went from the current low to 4-10 times, there would not be enough places to park all the airplanes. Homebuildt airplanes would then have to...
  14. H

    Scaling formulae

    To scale search "stan Hall" and it shows you the factors. Double size you P2/P1= 2^3.5 to get the new power. For example, if you have 10 hp for the original size you would need 113 hp and your speed would be 2^1/2 or 1.41 times faster on the 113 hp. To make it go as fast you would lower the...
  15. H

    Two cylinder engines

    The Hirth 3502 shows 3.9 gallon/hr at 60 hp. 3.9x6=23.4lbs/hr 23.4/60 = .39 lbs/hp-hr. See Recreational Power Engineering - Hirth Engines - Tiffin, Ohio - Factory Authorized US Distributor A Lycoming is .43-.48 lbs/hp-hr. Seems either Recpower made a mistake or that two stroke is lower...
  16. H

    Distributed Electric Propulsion

    On page 13 of the attachment it has a graph showing fuel price comparisons. The blue line is the cost of electricity... at about $1/gallon vs auto gasoline (without road tax) at around $3. Question 1: Where does one find electricity at such a low rate? If you take 33 kw-hr/gallon that is...
  17. H

    Distributed Electric Propulsion

    Jeff, When power lift is provided to a wing, that power must be held constant or the lift varies. Pull the power back and you pull back the lift. This coupling of lift should be eliminated for average pilots to deal with it. This requires another motor that controls the glide slope that is...
  18. H

    What is wrong with VTOL? -matters of design philosophy

    Aircar, So, let's do a little ATOL scrutiny. 1) Airplane engine and a ground engines living in two worlds. An airplane is at high power without a transmission, and a ground engine is at lower power, with short term peak power, and has a transmission for leverage (acceleration), along with...
  19. H

    What is wrong with VTOL? -matters of design philosophy

    Aircar, NASA is a way to take money from the taxpayer. Need I say more? Take Mark Moore for example. He has worked for 30 years on VTOL. What does he have to show for it? Not much that is practical. Osprey v-22? Try that in the handicap parking spot at Walmart.... Had Mark put his own...
  20. H

    What is wrong with VTOL? -matters of design philosophy

    Ok, why don't enough people fly? Easy, unless it is roadable, and better yet, able to fit in the handicap parking spot with the little wheelchair thingy hanging down, they ain't going to buy into the concept. Think about it... Have you ever watched people look for parking spots at a mall...
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