Piasecki Compound CH--47

[chopper2004]

Reminds me of the Boeing BV-347 program flight test program of the late 70s

https://aviationweek.com/defense-space/aircraft-propulsion/piasecki-refreshes-hybrid-chinook-concept

https://cimg8.ibsrv.net/gimg/pprune.org-vbulletin/2000x1504/piasecki_chinook_154ae3ed6ebb435f39e636fe591a1fcd5faccdff.jp g

cheers

[rugmuncher]

:bored: - “minimum” modification of the Chinook

Yeah right,,,,

[NutLoose]

I can see the crewman now, inside the cabin with a huge crank handle altering the pitch of the wings and things.. Or maybe they would have a wheel for him like a Hamster to change the pitch. :}

[SansAnhedral]

The 347 used a pair of 4 bladed rotors to boot

[Lonewolf_50]

“These engines have got more power than this drive system can handle. So we would max out the power to the rotors for maximum lift, then we would shunt the excess power output to the fan so they produce lift in hover as well,” Piasecki says.

“The net effect is your useful load is increased, even though you’re putting the wing and thrusters on it. Then you can use the engines to go faster and they’ve got better (performance) specifics,” he notes.
If the picture in the article is anything like a prototype ... the wing attach points, and the fan shroud attach points, as regards the vibration analysis will doubtless be interesting.
https://cimg0.ibsrv.net/gimg/pprune.org-vbulletin/2000x1504/hybridchinook_small_5342bf37017880502521b2134135ac42fd2f1031 .jpg
I recall a few comments from Mr. Dixson about the Speedhawk, not sure if they apply to the tandem rotor configuration.

[212man]

If the picture in the article is anything like a prototype ... the wing attach points, and the fan shroud attach points, as regards the vibration analysis will doubtless be interesting.
Do you have English ancestry? That has a certain level of understatement ! 😂

[Lonewolf_50]

Do you have English ancestry? That has a certain level of understatement ! 😂 On my grandmother's side, quite a few generations back: York.

[212man]

On my grandmother's side, quite a few generations back: York.
you certainly can pass the test!

I think my response would be “sod that for a game of soldiers”

[OvertHawk]

you certainly can pass the test!

I think my response would be “sod that for a game of soldiers”

I will watch with interest - from a considerable distance away!

[Pittsextra]

To be fair they probably thought similar when the first helicopters appeared…