Various of Early Little Known Helicopters & VTOL Airplanes

[T. A. Gardner]

For different and little known, there's this one:



That's the Marquardt M-14 "Whirlajet" (N4107K) with rotor tip ramjet propulsion flown in 1948. And it did fly..



Other variants in the US about the same time period with rotor tip ramjets or jet engines included the:

McDonnall XH-20 "Little Henry"
Hiller HJ-1/YH-32 "Hornet"
Hughes XH-17
American Helicopter XH-26

https://www.avfoil.com/vertical-magazine-news/vertical-rewind-tip-powered-pioneer/

 

[hesham]

From, Special Types of Rotary Wing Aircraft,

here is a two French designers,Robert and Pillet of 1904.

https://books.google.com.eg/books?i...Special Types of Rotary Wing Aircraft&f=false

 

[KHambsch]

For different and little known, there's this one:

View attachment 653794

That's the Marquardt M-14 "Whirlajet" (N4107K) with rotor tip ramjet propulsion flown in 1948. And it did fly..

View attachment 653795

Other variants in the US about the same time period with rotor tip ramjets or jet engines included the:

McDonnall XH-20 "Little Henry"
Hiller HJ-1/YH-32 "Hornet"
Hughes XH-17
American Helicopter XH-26

https://www.avfoil.com/vertical-magazine-news/vertical-rewind-tip-powered-pioneer/

Me thinks those have to be pulsejet engines...just no way they're ramjets. Note the square fronts for shutter flap valves.

 

[KHambsch]

For different and little known, there's this one:

View attachment 653794

That's the Marquardt M-14 "Whirlajet" (N4107K) with rotor tip ramjet propulsion flown in 1948. And it did fly..

View attachment 653795

Other variants in the US about the same time period with rotor tip ramjets or jet engines included the:

McDonnall XH-20 "Little Henry"
Hiller HJ-1/YH-32 "Hornet"
Hughes XH-17
American Helicopter XH-26

https://www.avfoil.com/vertical-magazine-news/vertical-rewind-tip-powered-pioneer/

Me thinks those have to be pulsejet engines...just no way they're ramjets. Note the square fronts for shutter flap valves.

Definitely pulsejets...a quick search revealed it. Lets see if I can get the text....

For different and little known, there's this one:

View attachment 653794

That's the Marquardt M-14 "Whirlajet" (N4107K) with rotor tip ramjet propulsion flown in 1948. And it did fly..

View attachment 653795

Other variants in the US about the same time period with rotor tip ramjets or jet engines included the:

McDonnall XH-20 "Little Henry"
Hiller HJ-1/YH-32 "Hornet"
Hughes XH-17
American Helicopter XH-26

https://www.avfoil.com/vertical-magazine-news/vertical-rewind-tip-powered-pioneer/

Me thinks those have to be pulsejet engines...just no way they're ramjets. Note the square fronts for shutter flap valves.

P.Lambermont "Helicopters and Autogyros of the World", 1958​

​

Technical data for Marquardt M-14 Engine: 2 x pulse-jets, empty weight: 363kg, gross weight: 544kg, cruising speed: 104km/h​

So for the M-14 shown in the images above, they're definitely pulsejets.

 

[hesham]

For different and little known, there's this one:

View attachment 653794

That's the Marquardt M-14 "Whirlajet" (N4107K) with rotor tip ramjet propulsion flown in 1948. And it did fly..

View attachment 653795

Other variants in the US about the same time period with rotor tip ramjets or jet engines included the:

McDonnall XH-20 "Little Henry"
Hiller HJ-1/YH-32 "Hornet"
Hughes XH-17
American Helicopter XH-26

https://www.avfoil.com/vertical-magazine-news/vertical-rewind-tip-powered-pioneer/

That's post WWII.

 

[KHambsch]

For different and little known, there's this one:

View attachment 653794

That's the Marquardt M-14 "Whirlajet" (N4107K) with rotor tip ramjet propulsion flown in 1948. And it did fly..

View attachment 653795

Other variants in the US about the same time period with rotor tip ramjets or jet engines included the:

McDonnall XH-20 "Little Henry"
Hiller HJ-1/YH-32 "Hornet"
Hughes XH-17
American Helicopter XH-26

https://www.avfoil.com/vertical-magazine-news/vertical-rewind-tip-powered-pioneer/

That's post WWII.

I have these posted somewhere else here at SPF, however, being as Hiller is mentioned above, I think it appropriate ti show them again. K

 

[publiusr]

For different and little known, there's this one:

View attachment 653794

That's the Marquardt M-14 "Whirlajet" (N4107K) with rotor tip ramjet propulsion flown in 1948. And it did fly..

View attachment 653795

Other variants in the US about the same time period with rotor tip ramjets or jet engines included the:

McDonnall XH-20 "Little Henry"
Hiller HJ-1/YH-32 "Hornet"
Hughes XH-17
American Helicopter XH-26

https://www.avfoil.com/vertical-magazine-news/vertical-rewind-tip-powered-pioneer/

Me thinks those have to be pulsejet engines...just no way they're ramjets. Note the square fronts for shutter flap valves.

Would that work on Titan…but with an oxidizer in place of the fuel tank say? Not rich enough?

 

[KHambsch]

For different and little known, there's this one:

View attachment 653794

That's the Marquardt M-14 "Whirlajet" (N4107K) with rotor tip ramjet propulsion flown in 1948. And it did fly..

View attachment 653795

Other variants in the US about the same time period with rotor tip ramjets or jet engines included the:

McDonnall XH-20 "Little Henry"
Hiller HJ-1/YH-32 "Hornet"
Hughes XH-17
American Helicopter XH-26

https://www.avfoil.com/vertical-magazine-news/vertical-rewind-tip-powered-pioneer/

Me thinks those have to be pulsejet engines...just no way they're ramjets. Note the square fronts for shutter flap valves.

Would that work on Titan…but with an oxidizer in place of the fuel tank say? Not rich enough?

 

[KHambsch]

Would that work on Titan...at first I didn't understand the question.
I had to first check the atmospheric composition and pressure. The oxygen would be carried in a fuel tank. Re your question ...maybe, I'm not sure. While the atmospheric composition is ~ 95% nitrogen and ~ 5% methane, the atmospheric pressure is ~ 50% higher. That means more methane to react (burn) with the 02 carried on board. This could be easily simulated/modelled in a vacuum tank. I imagine that changes to the geometry of the ramjet would be needed. Based on intuition, I'm leaning toward a yes to your question. One other challenge would be to carry enough 02 to make sorties of reasonable duration. I believe this would mean carring LOX.
Please keep me informed. Kevin

 

[publiusr]

Here aircraft carry fuel but get air free. On Titan it's the reverse. Better because it's cold an LOX lines are cleaner than fuel lines-lower gravity-all very "engine friendly."

 

[hesham]

From, Rivista_aeronautica 1950.

 

[hesham]

From, Helicopters Before Helicopters,

Mr. A. M. Young and his activities,also in Bell company,and a patent.

From Technika Lotnicza 1989