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From Ailes 19/4/1958,
maybe this one was U-17 ?.
From Aeroplane 1958
From Ailes 19/4/1958,
maybe this one was U-17 ?.
On the back cover of this issue was an ad for Firestone Helicopters that has artwork for the GA-50.
Enjoy the Day! Mark
Dear Hesham, I hope you don't mind if I leave here a bigger resolution pictures?From these report and site,Firestone XR-14 mock-up.
Firestone XR-14
3/4 right front view of prototype aircraft in exhibit room.corescholar.libraries.wright.edu
Hi,
Mr. Horace T. Pentecost founded Hoppi-Copter Inc company,he designed the HX-1 or
Model-100,a one man copter with two contra-rotating rotors,followed by Model-101 &
Model-102,evolved into the 1950 experimental Firefly with an 18' rotor powered by
tip ramjets.
He also designed a very cheap single seat Helicopter,also there was a Model-103 and
Model-104.
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Thanks a lot for this!I came across also model 103 - I identify it with having an engine moved below main frame (clearly visible). Model 104 (if I recall correctly) was to be made in England in some cooperation, but I was never able to find any picture which will clearly indicate it as a separate thing)
This is not straight forward. I Just came on the couple of articles in Aviation Week archives and one said that Model 102 "will" be the production version of currently-being-tested tripod version of Hoppicopter. Like year later an article depicts model 103 (which in my mind was model 102 - with just a battery hanging below pilot) and on the right on the bottom picture is shown flying model 104 - but this is hard to identify - I seems not to have an engine below the pilot like in the version I used to call 103May be of interest:
I came across also model 103 - I identify it with having an engine moved below main frame (clearly visible). Model 104 (if I recall correctly) was to be made in England in some cooperation, but I was never able to find any picture which will clearly indicate it as a separate thing)
This may also be true, but I still have some other doubts on models 102 -103 - 104.I gather the only major difference about Model 104 was the more spaced-out rotors.
Grumman never created an attack helicopter that I ever heard of.This is the first time I remember seeing this compound helicopter from Grumman. Anyone have any other information?
I suspect the model coaxial lurking behind it is an early Sikorsky LHX.