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Search: Posts Made By: Graviman
Showing results 1 to 35 of 1000
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Forum: Rotorheads
24th Jul 2014, 17:55
Replies: 81
Views: 49,859
Posted By Graviman

TEOS POWERTRAIN ENGINEERING - Diesel aircraft...

TEOS POWERTRAIN ENGINEERING - Diesel aircraft engine (http://www.teos-engineering.com/experience/diesel-aircraft-engine/)

Iron bird testing:...
Forum: Rotorheads
21st May 2014, 18:13
Replies: 81
Views: 49,859
Posted By Graviman

Riff, Thanks for that paper. Agreed it...

Riff,

Thanks for that paper. Agreed it would be great if Ironbird taking to the sky kicked off new R&D to examine whether a modern incarnation of CCEP could generate the same level of improvement...
Forum: Rotorheads
15th May 2014, 19:17
Replies: 81
Views: 49,859
Posted By Graviman

Riff, read your paper: wow! Looks to me as...

Riff, read your paper: wow!

Looks to me as if the only reason this didn't happen was because of the diffculty in convincing investors of the market. Maybe that's about to change...

Soave, Frank...
Forum: Rotorheads
7th May 2014, 18:15
Replies: 81
Views: 49,859
Posted By Graviman

Riff, Don't think it's the same engine,...

Riff,

Don't think it's the same engine, looks like a Mercedes derived aero engine(?). I'm impressed that the flight test is in a YAK-52: Those wings are relatively untwisted, which means it will...
Forum: Rotorheads
2nd May 2014, 11:53
Replies: 81
Views: 49,859
Posted By Graviman

Corax, this piston pounder burns Jet-A1....

Corax, this piston pounder burns Jet-A1. Available from your friendly local fuel bowser.

Martin, with latest gen Fadec this system will be single control. Besides diesels don't need carb heat. ;)
Forum: Rotorheads
30th Apr 2014, 16:44
Replies: 81
Views: 49,859
Posted By Graviman

Run / shutdown - cold soak - restart & run to FLRS...

Potentially next big thing in helicopters about to take to skies:

http://www.ainonline.com/sites/default/files/uploads/310_dieselpicture2.jpg

Europe?s Diesel Demonstrator To Fly This Year |...
Forum: Rotorheads
28th Apr 2014, 17:19
Replies: 96
Views: 27,451
Posted By Graviman

Any news on Airbus helicopter diesel?

Must admit that I was suprised at the timescale of developing the Jet A1 burning V12 diesel (TEOS/Austro/Steyr) and then installing it in an EC120. This time last year the thinking was that first...
Forum: Rotorheads
3rd Apr 2014, 17:21
Replies: 488
Views: 209,402
Posted By Graviman

Interesting that even with rotor scaled up from...

Interesting that even with rotor scaled up from X2 the advancing blade technology on S-97 is still capable of 220kts. Nr will have gone down a little, so the longer blades will still have a...
Forum: Rotorheads
26th Jun 2013, 17:20
Replies: 33
Views: 14,304
Posted By Graviman

AHS vertiflite article

https://vtol.org/vertiflite/project-zero/index.html#/2/

Hmmm, interesting - I especially like the bit about it using a diesel engine genset to power the fan motors! Does anyone know whether ORAL...
Forum: Aviation History and Nostalgia
20th Apr 2012, 11:52
Replies: 8
Views: 2,470
Posted By Graviman

I'm slightly suprised by the limited response to...

I'm slightly suprised by the limited response to this.

Can you guys give me an idea about whether or not this is interesting and why or not?

I'm trying to help the guy that organises these...
Forum: Rotorheads
5th Apr 2012, 11:57
Replies: 96
Views: 27,451
Posted By Graviman

Helinut, the engines should more accurately be...

Helinut, the engines should more accurately be referred to as compression ignition (C.I.) engines. They are burning jet A1 for which there is a ready untaxed supply. The main modification over a...
Forum: Aviation History and Nostalgia
3rd Apr 2012, 16:47
Replies: 8
Views: 2,470
Posted By Graviman

Lectures given by Apollo astronauts in UK.

A UK lecture will be given by Harrison Schmitt (Apollo 17 LMP) Oct 19th & 20th.

To buy tickets please contact Ken Willoughby directly via the website (email address therein). The event is...
Forum: Rotorheads
3rd Apr 2012, 11:52
Replies: 96
Views: 27,451
Posted By Graviman

Exciting new development.

TEOS 440shp diesel V12 (using Steyr M16 componentry):

http://www.teos-engineering.com/mbFiles/documents/article-aviation-week-space-technology-20120213-54218.pdf

GRC4: Integration of a Diesel...
Forum: Rotorheads
3rd Feb 2012, 11:58
Replies: 139
Views: 60,066
Posted By Graviman

Must admit to keeping my mouth shut on this one....

Must admit to keeping my mouth shut on this one. The wings will unload the rotor to help with retreating blade stall (like AH-56 Cheyenne), but this solution seems to have greater complexity over the...
Forum: Rotorheads
13th Jan 2012, 18:22
Replies: 96
Views: 27,451
Posted By Graviman

Yes, he also mentioned this at his talk at the...

Yes, he also mentioned this at his talk at the R.A.S. (London). Diesel helicopters will come, particularly with the rate of development at Austra Engine.

Helicopters in the short term have to be...
Forum: Rotorheads
13th Jan 2012, 11:55
Replies: 96
Views: 27,451
Posted By Graviman

Must admit to holding out there to see if anyone...

Must admit to holding out there to see if anyone else would bite...

Actually the guys to watch are:

Startseite (http://www.austroengine.at/)

Because of this
...
Forum: Rotorheads
4th Jan 2012, 11:54
Replies: 96
Views: 27,451
Posted By Graviman

Not sure about status of deltahawk without...

Not sure about status of deltahawk without checking website:

DeltaHawk Diesel Engines (http://www.deltahawkengines.com/)


Another very competant design to watch is the Wilsch AirMotive (also a...
Forum: Rotorheads
30th Nov 2011, 11:54
Replies: 925
Views: 348,681
Posted By Graviman

S-97 Raider supplier selection

Great photo, TurboEddie. Really shows and contrasts the different aerodynamic systems required for this technology.

http://postmediaottawacitizen.files.wordpress.com/2012/01/id40441_600.jpg


...
Forum: Rotorheads
12th Oct 2011, 18:17
Replies: 925
Views: 348,681
Posted By Graviman

Dave, at the risk of going off topic: Surely...

Dave, at the risk of going off topic:

Surely the Kolibri was not ABC because the retreating blades were not actually unloaded? The rotor shafts just were not designed with the intention of...
Forum: Rotorheads
6th Oct 2011, 17:59
Replies: 925
Views: 348,681
Posted By Graviman

Much deserved! Thanks for posting John. :D ...

Much deserved! Thanks for posting John. :D


Was X2 just a publicity stunt? Not really, since it took ABC ideas already demonstrated in XH59 flights and developed them to the point that a...
Forum: Rotorheads
8th Sep 2011, 17:51
Replies: 201
Views: 61,161
Posted By Graviman

Looking at the photos, it's interesting to note...

Looking at the photos, it's interesting to note that there is no collective pitch mechanism or sprag clutch in the drivetrain - that would worry me. This will likely be the main area of development...
Forum: Rotorheads
6th Sep 2011, 11:52
Replies: 201
Views: 61,161
Posted By Graviman

The distinction between various electric...

The distinction between various electric powertrain technologies is becoming more blurred as performance improves. A fuel cell uses some kind of hydrocarbon fuel, with hydrogen favoured for transport...
Forum: Rotorheads
5th Sep 2011, 17:35
Replies: 201
Views: 61,161
Posted By Graviman

Great! Thanks for posting this, Dave. Looks a lot...

Great! Thanks for posting this, Dave. Looks a lot safer than putting a match to AvGas - you check all your fuses right? ;)

Interestingly there is no real performance disadvantage, in terms of...
Forum: Rotorheads
8th Aug 2011, 17:51
Replies: 925
Views: 348,681
Posted By Graviman

Don't forget, Riff, the Sikorsky philosophy of...

Don't forget, Riff, the Sikorsky philosophy of designing the product to suit civilian market requirements while meeting DOD specifications. The ability to hop point-to-point at reasonable cruise...
Forum: Rotorheads
29th Jul 2011, 11:53
Replies: 925
Views: 348,681
Posted By Graviman

Dave, you are fogetting that this applies to...

Dave, you are fogetting that this applies to fixed wing too. As the machine design cruise speed gets faster the drag remains the same because the wings are optimised for the higher speed (wingspan...
Forum: Rotorheads
16th May 2011, 11:53
Replies: 17
Views: 10,316
Posted By Graviman

Does he mean rear wheels? I guess this is always...

Does he mean rear wheels? I guess this is always going to be a problem with a tail dragger.

Fixed front landing strut:
http://www.chinook-helicopter.com/standards/images/forgear1.jpg

Steerable...
Forum: Rotorheads
10th May 2011, 11:52
Replies: 29
Views: 13,162
Posted By Graviman

Congrats, Nick! I just can't wait to see how...

Congrats, Nick!

I just can't wait to see how far the helicopter concept can be pushed while remaining a practical flying machine. :cool:

Mart
Forum: Rotorheads
28th Apr 2011, 17:59
Replies: 925
Views: 348,681
Posted By Graviman

This looks like a great conference: I will attend...

This looks like a great conference: I will attend if possible.
Forum: Rotorheads
21st Apr 2011, 11:58
Replies: 56
Views: 12,962
Posted By Graviman

Dave, Not pooh-poohing the Focardi-Rossi...

Dave,

Not pooh-poohing the Focardi-Rossi demonstration, but there are plenty of chemical reasons why introducing hydrogen to nickel might give off excess heat. The nickel could just catalyse a...
Forum: Rotorheads
19th Apr 2011, 11:48
Replies: 56
Views: 12,962
Posted By Graviman

Electrical systems can be developed around...

Electrical systems can be developed around battery in preparation for emergent fuel cell technologies...

Intelligent energy is up to around 500W/kg using proton exchange membrane fuel cells, so...
Forum: Rotorheads
6th Apr 2011, 11:58
Replies: 27
Views: 18,747
Posted By Graviman

In gliders you are limited to 1/3 control inputs...

In gliders you are limited to 1/3 control inputs above Va, so are taught to accept g over speed in spin recovery.

Does that 3g rotor limit apply only to centred cyclic? I imagine there would be...
Forum: Rotorheads
22nd Mar 2011, 12:50
Replies: 925
Views: 348,681
Posted By Graviman

Never a doubt in my mind that this day would...

Never a doubt in my mind that this day would come.

Serious congratulations to all involved: managers, designers, analysts, testers, and pilot :D

This about sums it up:


Collier Trophy -...
Forum: Rotorheads
14th Mar 2011, 12:56
Replies: 9
Views: 3,406
Posted By Graviman

Alwyn, I've edited my post after time to...

Alwyn,

I've edited my post after time to think about what you actually want. :\

What you need are some basic calculations which are nicely laid out in chapter 1 of Prouty (Imperial units) or...
Forum: Rotorheads
1st Mar 2011, 11:46
Replies: 925
Views: 348,681
Posted By Graviman

Still an excellent video IFMU. I suspect X2...

Still an excellent video IFMU.

I suspect X2 will go a little quiet while S-97 goes through design & development. ;)

Actually, I have suggested the Sikorsky/Schweitzer design/analysis/test...
Forum: Rotorheads
23rd Feb 2011, 11:58
Replies: 69
Views: 11,192
Posted By Graviman

Helisphere, what you have to remember is that...

Helisphere, what you have to remember is that total pressure (static + dynamic) only stays constant along a streamline. So in an ideal world the pitot-static ports both operate on the same...
Showing results 1 to 35 of 1000
 
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