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Search: Posts Made By: gevans35
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Forum: Rotorheads
12th Sep 2019, 18:14
Replies: 37
Views: 8,669
Posted By gevans35

It has been done, but not by your average Joe in...

It has been done, but not by your average Joe in an R22.

https://books.google.co.uk/books?id=MMEK1jwD03AC&pg=PT103&dq#v=onepage&q&f=false
Forum: Jet Blast
21st Mar 2019, 15:34
Replies: 4,749
Views: 717,297
Posted By gevans35

There is a UK Government and Parliament petition...

There is a UK Government and Parliament petition to "Revoke Article 50 and remain in the EU" which is gaining some traction.
https://petition.parliament.uk/petitions/241584
Forum: Rotorheads
12th Dec 2018, 07:31
Replies: 42
Views: 8,305
Posted By gevans35

Didn't they dub the sound track with turbine...

Didn't they dub the sound track with turbine noises, or was that another movie?
Forum: Rotorheads
9th Dec 2018, 12:38
Replies: 150
Views: 11,887
Posted By gevans35

Chinook is a different ball game, as is V22,...

Chinook is a different ball game, as is V22, although large hybrid VTOL multi motor tilt wing transport aircraft are suggested in various NASA articles.
Forum: Rotorheads
8th Dec 2018, 09:34
Replies: 1,174
Views: 548,026
Posted By gevans35

'Twas always thus. Years ago, I was fortunate to...

'Twas always thus. Years ago, I was fortunate to notice the clutch light flicker a couple of times during run-up on an R22 and shut down. It turned out to be the upper sheave bearing breaking up. Not...
Forum: Rotorheads
6th Dec 2018, 19:36
Replies: 150
Views: 11,887
Posted By gevans35

I wouldn't get too hung up on the "Extra" motor,...

I wouldn't get too hung up on the "Extra" motor, that was designed for an aerobatic aeroplane. An ETR would need a motor optimised for that application and rated/de-rated to provide 100% continuous...
Forum: Rotorheads
6th Dec 2018, 19:27
Replies: 1,174
Views: 548,026
Posted By gevans35

They're still investigating the "initial cause...

They're still investigating the "initial cause and exact sequence of the failure".

I have heard of bearings being stripped of grease by over aggressive cleaning, pressure washer?
Forum: Rotorheads
6th Dec 2018, 19:14
Replies: 150
Views: 11,887
Posted By gevans35

Does one need more than 5 minutes continuous,...

Does one need more than 5 minutes continuous, would 30 minutes at 90% suffice?

I read 20 minutes as battery life, the ETR application would be generator driven.

Surely a prop in the slipstream...
Forum: Rotorheads
6th Dec 2018, 18:33
Replies: 1,174
Views: 548,026
Posted By gevans35

That's what it says in the report. Either it...

That's what it says in the report.

Either it was burnt off by an overheated bearing, or it was the cause of the over temperature and seizure?
Forum: Rotorheads
6th Dec 2018, 18:14
Replies: 1,174
Views: 548,026
Posted By gevans35

There was no grease, in it's original form, in...

There was no grease, in it's original form, in the bearing. Was that likely to be cause or effect?
Forum: Rotorheads
6th Dec 2018, 17:53
Replies: 150
Views: 11,887
Posted By gevans35

Battery capacity?

Battery capacity?
Forum: Rotorheads
6th Dec 2018, 15:34
Replies: 150
Views: 11,887
Posted By gevans35

Maybe you're correct, but organisations such as...

Maybe you're correct, but organisations such as NASA, Rolls Royce, Bell and others would appear to disagree with you.
Forum: Rotorheads
5th Dec 2018, 16:27
Replies: 150
Views: 11,887
Posted By gevans35

I don't know for sure but I doubt it. I assumed...

I don't know for sure but I doubt it. I assumed they rely on the multiple motors for redundancy, but I could be wrong.

Here's a bit more info on the RR one which they say could be flying in the...
Forum: Rotorheads
5th Dec 2018, 13:01
Replies: 150
Views: 11,887
Posted By gevans35

https://cimg9.ibsrv.net/gimg/pprune.org-vbulletin/...

https://cimg9.ibsrv.net/gimg/pprune.org-vbulletin/624x351/x57_cc484f68b5ce34449b5eaf5d0bb414d95ff67740.jpg...
Forum: Rotorheads
5th Dec 2018, 11:49
Replies: 150
Views: 11,887
Posted By gevans35

My thoughts exactly.

My thoughts exactly.
Forum: Rotorheads
4th Dec 2018, 07:36
Replies: 150
Views: 11,887
Posted By gevans35

https://cimg0.ibsrv.net/gimg/pprune.org-vbulletin/...

https://cimg0.ibsrv.net/gimg/pprune.org-vbulletin/1024x768/head_in_sand_1024x768_95a05e9e53f86b936c6007d2561e1a61d59fb20e.png
Forum: Rotorheads
3rd Dec 2018, 18:31
Replies: 150
Views: 11,887
Posted By gevans35

Stuck collective is manageable , depending on...

Stuck collective is manageable , depending on position, cyclic less so.
Forum: Rotorheads
3rd Dec 2018, 18:06
Replies: 10
Views: 4,398
Posted By gevans35

And good skills to back away from the wires...

And good skills to back away from the wires without fouling the main rotor.
Forum: Rotorheads
2nd Dec 2018, 13:47
Replies: 150
Views: 11,887
Posted By gevans35

I would agree with you if it's pure electric...

I would agree with you if it's pure electric power, but a hybrid VTOL aircraft powered by electric motors, with a battery or capacitors, replenished by a gas turbine or diesel generator, may be...
Forum: Rotorheads
2nd Dec 2018, 09:41
Replies: 150
Views: 11,887
Posted By gevans35

First they ignore you, then they laugh at you,...

First they ignore you, then they laugh at you, then they fight you, then you win.

Mahatma Gandhi
Forum: Rotorheads
2nd Dec 2018, 00:37
Replies: 150
Views: 11,887
Posted By gevans35

Some interesting reading. Overview of NASA...

Some interesting reading.

Overview of NASA Electrified Aircraft Propulsion Research for Large Subsonic Transports.
https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20180000361.pdf

GRC3:...
Forum: Rotorheads
1st Dec 2018, 20:40
Replies: 150
Views: 11,887
Posted By gevans35

I would think battery. Battery technology is...

I would think battery. Battery technology is going forward in leaps and bounds so maybe not so big
Forum: Rotorheads
1st Dec 2018, 18:22
Replies: 150
Views: 11,887
Posted By gevans35

I would have been surprised if someone wasn't...

I would have been surprised if someone wasn't working on it..... Boeing too? Airbus? Robinson?
Forum: Rotorheads
1st Dec 2018, 17:16
Replies: 150
Views: 11,887
Posted By gevans35

A single turbine generator with battery backup to...

A single turbine generator with battery backup to provide "instantaneous" torque and sufficient reserve to get safely on the ground in the event of generator failure? Would probably be good to have a...
Forum: Rotorheads
1st Dec 2018, 17:03
Replies: 150
Views: 11,887
Posted By gevans35

Or an even simpler design with direct drive...

Or an even simpler design with direct drive electric motors and no gearboxes at all?
Showing results 1 to 25 of 45
 


 
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