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Thread: Flying on 14 hp

  1. #196
    Registered User BBerson's Avatar
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    Re: Flying on 14 hp

    I was just yesterday looking closely at Paul McCready's Solar Challenger for ideas about optimal structure. The black carbon main spar is visible in the photo. I am wonduring if the tube spar at the 1/4 chord is more optimal than a D -Cell?

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    Re: Flying on 14 hp

    Quote Originally Posted by BBerson View Post
    I was just yesterday looking closely at Paul McCready's Solar Challenger for ideas about optimal structure. The black carbon main spar is visible in the photo. I am wonduring if the tube spar at the 1/4 chord is more optimal than a D -Cell?
    -shure!

    http://basia38.tripod.com/jozefborzecki/id34.html

    =22 HP (VW 1100), 120 kg...

  3. #198
    Registered User BBerson's Avatar
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    Re: Flying on 14 hp

    Quote Originally Posted by henryk View Post
    -shure!

    http://basia38.tripod.com/jozefborzecki/id34.html

    =22 HP (VW 1100), 120 kg...
    I see the spar shadow through the fabric. Is it a tube? What does it weigh?

    edit: found it was 120 kg.
    The designer is very small!
    Last edited by BBerson; March 20th, 2017 at 07:25 PM.

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    Re: Flying on 14 hp

    Quote Originally Posted by henryk View Post
    -shure!

    http://basia38.tripod.com/jozefborzecki/id34.html

    =22 HP (VW 1100), 120 kg...
    I love that plane in the link, awesome! I also would never fit in it unfortunately.

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    Moderator Dana's Avatar
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    Re: Flying on 14 hp

    Quote Originally Posted by lr27 View Post
    Wasn't the main point of the original post basically just to fly?
    Yes, just getting airborne was the point, just like the early hang gliders where the rule was "don't fly higher than you're willing to fall." It was pretty cool when nobody had done anything like that before, at least at that price. But people eventually got bored with short hops, frustrated with the limitations (can't fly if there's any significant wind, which is why the FAA made the exception allowing ultralights to fly a half hour before sunrise and a half hour after sunset), and got tired of repairing the fragile structures.

    Dana
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  6. #201
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    Re: Flying on 14 hp

    How do you get to see any of this translated to english,henryk?

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    Re: Flying on 14 hp

    Quote Originally Posted by henryk View Post
    -shure!

    http://basia38.tripod.com/jozefborzecki/id34.html

    =22 HP (VW 1100), 120 kg...
    This guy was awesome, is there anything on how he calculated and carved his propellers? In English?

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    Re: Flying on 14 hp

    Dang those are nice props!

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    Re: Flying on 14 hp

    Quote Originally Posted by lr27 View Post

    What is the span of the ultralights you are comparing it to? If they're not close to 36 feet, you're comparing apples and oranges, though I admit neither of those would make a decent aircraft. ;-)

    More apples vs oranges.
    Pterodactyl 33 foot span canard. Canards aren't so great for maximum lift, plus it still has significantly less span than a VJ-24. Or maybe you meant some other version?
    Easy Riser 30 foot span swept flying wing biplane
    CGS Hawk 29 foot span and heavier (310 lbs empty)

    The Pterodacytl canard was....optional, also not usually weight bearing. Figure it as a flying wing, and the canard pure pitch control. You trimmed with weight shift, and the canard just floated in trail at cruise.

    In another thread someone says weight shift pitch control restricts you in turbulence.... True. However the Pterodactyl is an example of how absolutes are wrong. Weight shift controlled 'dactyls had a decent safety record, you were limited in speed ( it's hard to pull forward to far in the cage. ) the canards gave you more authority, and it could be abused. ( Big engines and higher than manual speeds were a factor )

    The Easy Riser? Do you figure span loading on each wing separately on a biplane? ? Experience shows they are very strong, fly well on marginal power. ( but marginal... is marginal. Trees rising before you........ )

    A lot of Hawks ended up over weight, in part because "more power" and luxury items, like instruments. the later, lightened version did make weight, but with a small engine. It has a decent wing, and like all pt 103 craft, building light is an art and a necessity.

    I'd think any of the above would fly well and climb great with 30 odd hp. ( which, unfortunately, is twice the desired figure. It's what I'm planning on for a trike, seeming to have the best power to weight balance with enough for good climb. ( Polini Thor 200 ) )

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    Re: Flying on 14 hp

    Flying on 14hp in cruise should be sufficient. But for takeoff, another engine booster is needed. Could be electric.
    Easy to start electric when needed.

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    Re: Flying on 14 hp

    Quote Originally Posted by Aesquire View Post
    snip

    The Easy Riser? Do you figure span loading on each wing separately on a biplane? ? Experience shows they are very strong, fly well on marginal power. ( but marginal... is marginal. Trees rising before you........ )
    The further apart vertically the two wings are, the more span efficiency you get. So maybe the Easy Riser wings have the induced drag of a monoplane with a bit more span. However, biplanes are draggy. All that rigging and interference between the wings will have an effect, as will the flying wing issue.

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    Re: Flying on 14 hp

    Quote Originally Posted by BBerson View Post
    I see the spar shadow through the fabric. Is it a tube? What does it weigh?

    edit: found it was 120 kg.
    The designer is very small!
    -yes,it was circa 200 mm tube glued from 1mm birch (3-leyer ) from Canada...

    -foam ribs...

    -Alu fuselage, wooden wheels, all very ligt.

    =He was started (take off) at half power...

    =no foot pedals,only hand controll.

    Josef was flown on his airplanes>1000 hours !!!

    -last tragic fly in 1990, very good weather condytion,

    at circa 50 m level left wing was broken (I was whitness !)

    my English is to poore to translate...

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    Re: Flying on 14 hp

    Quote Originally Posted by henryk View Post
    -yes,it was circa 200 mm tube glued from 1mm birch (3-leyer ) from Canada...

    -foam ribs...

    -Alu fuselage, wooden wheels, all very ligt.

    =He was started (take off) at half power...

    =no foot pedals,only hand controll.

    Josef was flown on his airplanes>1000 hours !!!

    -last tragic fly in 1990, very good weather condytion,

    at circa 50 m level left wing was broken (I was whitness !)

    my English is to poore to translate...
    I am sorry to hear that you were the unfortunate witness to your friends demise. Tragic.

    I am very interested in his propeller designs, is there any information on the formulas he used or the methods he used for carving them?

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    Re: Flying on 14 hp

    Back to the Solar Challenger and its cantilever tubular spar.... In less extreme cases than the Solar Challenger, say a Part 103 ultralight or a European two-seat microlight, are there any advantages to the tube monospar vs. a straightforward D-cell like an Ercoupe?

    I could see something like an 8" heavy wall PVC pipe with grooves cut in it for pulled rivet clearance used as mandrel to create a tubular aluminum spar with tapered wall thickness, a bit like an old-fashioned spyglass riveted in the extended position.
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    Re: Flying on 14 hp

    Jozef was a technician,not engineer,but with big knowlage in aerotechnic...

    -propellers are selbst construction,but I have not this data.

    I have only one exemplar from STRATUS,iff interesting,it is possible to made photos.

    -Jozef was made maschine for mechanical copying woden propellers...

    PS=Jozef Bozecki was dead when 60 year old,but doctor was thinking,he was 40-years !

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