|
Post by racket on Feb 27, 2011 16:29:38 GMT -5
Hi Anders
What sort of engine are they using that can produce 150 kgs of thrust ?? its got to be aero based as you'd be needing a mass flow of ~3.5 lbs/sec minimum .
Is streamlining allowed under the rules ??
Those kicks are about as streamlined as a house brick , a bit of streamlining would lower drag to a fraction of the conventional kicks Cd and allow high speeds with minimal thrust .
Cheers John
|
|
|
Post by Johansson on Feb 28, 2011 1:06:20 GMT -5
They are using a single shaft APU turbine that powers a generator and produces starting air for the Swedish Navy´s attack boats, here are some specs for it: Max. Power (take-off) = 276 kW (WPS 375) Residual thrust = 147 N (kp 15) Specific fuel consumption = 424 g/kW h (g/WPS h 312) Max. continuous rating = 235 kW (WPS 320) Specific fuel consumption = 457 g/kW h (g/WPS h 336) Air mass flow = 1.91 kg/s Pressure ratio = 6.4:1 Speed (output) = 6000 l/min Turbine speed = 41900 l/min Length with coupling and gearbox = 1194 mm Width = 429 mm Height = 670 mm Weight (dry) = 83 kg www.bredow-web.de/Triebwerke_und_Flugzeugmotore/MTU_6022_-_Wellentriebwerk/mtu_6022_-_wellentriebwerk.htmlOn a Swedish army site I found these numbers, it seems to depent a lot on what model it is. Längd: 1 200 mm Bredd: 430 mm Höjd: 670 mm Motoreffekt: ca 115 hk vid 42 000 v/min Kompressor, tryckförhållande: 6,4:1 vid 42 000 v/min Reduktionsväxel: utväxling 11,7 :1 Utgående axels varvtal: 3 600 v/minThe turbine wheel cannot be very well suited for jet thrust either, but obviously it works.
|
|
|
Post by racket on Feb 28, 2011 3:36:58 GMT -5
Hi Anders
They were also helicopter engines , quite a large engine to be competing against , you need to think streamlining to lower your aero drag .
Cheers John
|
|
|
Post by Johansson on Feb 28, 2011 17:26:42 GMT -5
Some streamlining would be nice, our goal this year is to reach the finish line and nothing more (we´ve learned the hard way not to have high expectations...) but if we have enough time some sort of fairing will be made to lower the drag somewhat.
|
|
|
Post by Johansson on Mar 2, 2011 16:19:23 GMT -5
The brakes and afterburner heat shield are finished now!
|
|
|
Post by Richard OConnell on Mar 2, 2011 16:49:25 GMT -5
That looks absolutely terrifying. Best of luck ;D
|
|
|
Post by Johansson on Mar 2, 2011 16:58:07 GMT -5
Thanks a lot, I figure we´ll need it.
|
|
turborico
Member
Joined: December 2010
Posts: 24
|
Post by turborico on Mar 3, 2011 4:53:10 GMT -5
Wow! That's really something else! So, who gets to pilot it? Also, have you given it a name? A creation like that needs a proper name! Good luck!
|
|
|
Post by ernie wrenn on Mar 3, 2011 8:39:56 GMT -5
"HOT NUTZ" Seems like a quite fitting name..... maybe a few "NO SEATING HERE" signs would be needed.
Now that is a proper ride, it is a shame we are so far apart. I would love to try that sport.
Is the brake just a dig in hook for the ice? How about a small parachute for the driver with a dead man switch.... Would look sharp at the finish line..
Ernie
|
|
|
Post by Johansson on Mar 3, 2011 8:43:34 GMT -5
Olov is the pilot since he is the one paying for the build, but he has made me the backup pilot in case the kick turns out to be to fast for him.
He is used to driving tractors and I am used to riding my Hayabusa so he thinks that my balls are slightly larger than his in this regard. ;D
|
|
|
Post by Johansson on Mar 3, 2011 9:43:49 GMT -5
No name yet, it has to deserve one so if we get to the finish line this year we just might have a naming cermony for it. The brakes are simple hooks that dig in the ice, we will also use them to steer the kick with at speed. You should rent a container and take the Hearse over for a spin at the race, one week left so there is lots of time!
|
|
|
Post by Richard OConnell on Mar 3, 2011 11:22:18 GMT -5
Dont think it would qualify for the Iditarod, but could it hurt to try?
|
|
|
Post by Johansson on Mar 4, 2011 12:15:02 GMT -5
I built a stainless frying pan for the afterburner today, nice to have some bacon and egg for breakfast while getting the engine warmed up for the race.
|
|
|
Post by Johansson on Mar 5, 2011 14:49:17 GMT -5
|
|
turborico
Member
Joined: December 2010
Posts: 24
|
Post by turborico on Mar 5, 2011 17:39:33 GMT -5
Looking good!
Have you considered a bell-mouth intake?
|
|