PH turbine 928

[Pastry]

youve prob all seen it but thought id link it here anyway;

http://www.pistonheads.com/news/default.asp?storyId=22174

thought it might be nice for get-togethers; would make a great barbequeue.

 

[tscaptain]

Excellent! However, a few things do spring to mind. Firstly, haven't seen too many service stations selling Jet A1 fuel (although it is a lot cheaper than petrol!). Secondly, he must be a deaf as a post (as well as bonkers) standing 3 feet away from 130dB with no ear defenders and, thirdly, I would like to see it on the move.[] He must have very tolerant neighbours, sorry neighbors. The car in the vid only has one exhaust but the photo has two - different car or has he fitted two engines?[] Presumably you use the afterburner to give extra grip on the front tyres as it is pointing vertically!!

 

[DivineE]

Front end downforce must be fantastic with that afterburner lit

 

[sawood12]

I suspect the 'afterburner' is not an afterburner as we know it and primarily there for show. A great project though, would love to have a go, but only good for straight line runs. Gas turbines are not great in cars, they have been tried many times before and failed.

 

[tref]

I have visions of one of the scenes near the end of "Two Lane Black-top"...

 

[Fat Albert]

As it is a Helicopter engine it will be optimised for turning a shaft rather than throwing hot gases out the back, in which case an afterburner is completely pointless, and as has already been said.

I used to be a crewman on Wessex, we had two Rolls Royce Gnomes up front (shaft conversions of the Goblin fitted in the Vampire).
The cores themselves were very reliable, however the '60s computer technology was not!

We had 3,200 lb/ft of torque to play with, which would lift 13,600 lbs at Max all-up weight and allow us to cruise at 90 knots.

Without too much fuel we could carry up to 14 troops inside or a field gun slung underneath

The trick to getting a useful Gas turbine powered car would either be to make it electric powered (eg like the 125 train), with the GT running a genny, or to attach it via a (strong) CVT gearbox, with FADEC and an anticipator so it basically then works like a helicopter's Power/collective control

Pic of me in my yoof:

 

[sawood12]

Didn't Airwolf have an afterburner?

 

[Fat Albert]

Yes Airwolf did, but on its turbojets that were purely for forward thrust, I am still not sure how they overcame some of the key heli principles of flight such as retreating blade stall and the forward blade tips going supersonic...

I put this onto my flying forum and someone pointed out a strange irony, the engine was used in a strange ship-borne drone that was originally designed to fly with a Porsche engine!!!
http://en.wikipedia.org/wiki/Gyrodyne_QH-50_DASH

 

[Fat Albert]

I know Scotty, but in flying the pass-mark for the exams is 80%, and even then the 20% you don't know can still kill you.....

I had to take 14 exams for basic Loadmaster Ground school, 7 exams for Helicopter Ground school, then I had to do a week's Wessex-specific Systems training, with an exam, before I was even allowed to start my flying training!

 

[zcacogp]

ORIGINAL: sc0tty
geek!!

Yes, but - hells tits! - what a subject to be geeky about!

Better than cars, or computers, or trainspotting, or even music ... (perhaps I'm jealous ... I always wanted to go into the RAF, and had I not met Mrs zcacogp I'd like to think I would have done ... )


Oli.

 

[Fat Albert]

sadly, Olli, I didn't realise how lucky I was, I misbehaved a lot and got thrown out!

Great whilst it lasted and I got some of the best Management/Leadership training in the world

 

[sawood12]

ORIGINAL: zcacogp

ORIGINAL: sc0tty
geek!!

Yes, but - hells tits! - what a subject to be geeky about!

Better than cars, or computers, or trainspotting, or even music ... (perhaps I'm jealous ... I always wanted to go into the RAF, and had I not met Mrs zcacogp I'd like to think I would have done ... )


Oli.

I agree. There are three jobs i'd do for free - RAF pilot, F1 driver and Astronaut. I looked to join the RAF when I went to university (mature student) but would have been too old to begin flight training to be flight crew.

One way to get over the Helicoptor dynamic problems is to rotate the rotors though 90 degrees for horizontal flight ala V22 Osprey! That is a piece of kit and a half!

The engine in the 928 doesn't seem to yeld much power given its size. Generally size for size a gas turbine will generate 20 times the power of a piston engine (one of those rule of thumb things based upon the comparable flow of air though two machines of the same physical dimensions). This one is not that much smaller than a v8 and produces roughly the same power. Maybe because is incorporates a centrifugal compressor rather than axial compressors. An RR Gem engine (as fitted to early Lynx's) is much smaller and produces around 1000 shaft HP. The core of that engine is not much more than a foot long and about 10" in diameter.