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Search: Posts Made By: IFMU
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1st Sep 2021, 13:09
Replies: 416
Views: 297,118
Posted By IFMU

Exactly! I found it painful to watch.

Exactly! I found it painful to watch.
31st Aug 2021, 14:19
Replies: 416
Views: 297,118
Posted By IFMU

Not counting the other first time, of course: ...

Not counting the other first time, of course:
https://www.cnbc.com/2020/12/07/spacex-docks-two-dragon-spacecraft-to-the-iss-for-the-first-time.html

It is surprising how little real-time interest...
18th Aug 2021, 15:17
Replies: 31
Views: 2,383
Posted By IFMU

Rockets and spacecraft are only part of what is...

Rockets and spacecraft are only part of what is needed for Elon to reach his goal of Mars. I'd assume they are working the other needs behind the scenes. Of course we don't know this to be true. ...
18th Aug 2021, 13:27
Replies: 31
Views: 2,383
Posted By IFMU

Yes, SpaceX should definitely stick to their...

Yes, SpaceX should definitely stick to their current trivial tasks.
Forum: Rotorheads
6th Aug 2021, 00:22
Replies: 26
Views: 4,658
Posted By IFMU

That's a safe bet!

That's a safe bet!
Forum: Rotorheads
5th Aug 2021, 12:05
Replies: 26
Views: 4,658
Posted By IFMU

Perhaps they only need to deploy enough to clear...

Perhaps they only need to deploy enough to clear the wing, and then CF does the rest. From high speed to hover, reducing RPM & CF would put the blades on the deploy stop, and then they are slowly...
Forum: Rotorheads
1st Aug 2021, 01:27
Replies: 16
Views: 2,829
Posted By IFMU

Seems like it would save you the expense of an...

Seems like it would save you the expense of an inversion table for stretching out your back, though.
Forum: Rotorheads
31st Jul 2021, 18:20
Replies: 16
Views: 2,829
Posted By IFMU

This flew also: https://youtu.be/Co94Toqv4fw

This flew also:
https://youtu.be/Co94Toqv4fw
26th Jul 2021, 15:39
Replies: 4
Views: 1,131
Posted By IFMU

Yesterday they had a couple of incidents that...

Yesterday they had a couple of incidents that really messed up the traffic flow. A Stearman did a little nose over and a Piper did a gear up landing.
24th Jul 2021, 17:28
Replies: 37
Views: 2,750
Posted By IFMU

​​​​​​​Made me think of this: ...

​​​​​​​Made me think of this:
https://cimg6.ibsrv.net/gimg/pprune.org-vbulletin/572x400/6207460_orig_7e7fe830cfb87546dcca92059c69ee9faba5b327.jpg
Forum: Rotorheads
24th Jul 2021, 02:42
Replies: 348
Views: 114,939
Posted By IFMU

Think in terms of a fixed wing Cessna with two...

Think in terms of a fixed wing Cessna with two wing fuel tanks. One full, and one empty. You have to put in enough aileron to react the unbalanced fuel load, but the airplane still goes straight....
Forum: Rotorheads
23rd Jul 2021, 09:25
Replies: 348
Views: 114,939
Posted By IFMU

I've got no Sikorsky bosses anymore. I moved to...

I've got no Sikorsky bosses anymore. I moved to another UTC division when they closed Schweizer. I was the responsible engineer for the X2 flight controls though. And yes I've studied physics. ...
Forum: Rotorheads
22nd Jul 2021, 22:41
Replies: 348
Views: 114,939
Posted By IFMU

A conventional helicopter has to react the thrust...

A conventional helicopter has to react the thrust from the tail rotor with lateral cyclic. It's no big deal.

An X2 rotor system would use lateral cyclic, same direction for both rotors, to react...
Forum: Rotorheads
22nd Jul 2021, 22:37
Replies: 348
Views: 114,939
Posted By IFMU

Totally wrong. The coax limitation for yaw is in...

Totally wrong. The coax limitation for yaw is in autorotation. They leave room for differential collective on top of collective.
Forum: Rotorheads
21st Jul 2021, 13:08
Replies: 348
Views: 114,939
Posted By IFMU

Now your rambling is just getting silly. Why...

Now your rambling is just getting silly. Why would you think the prop torque would be a problem? Do you think there is not enough cyclic trim to balance it?
Forum: Jet Blast
3rd May 2021, 00:17
Replies: 1,249
Views: 73,475
Posted By IFMU

We need VP959 to come along and argue this...

We need VP959 to come along and argue this point, but I see he has not been on in over a month. Hope he is ok and hasn't been driven off a cliff by autopilot or something.
Forum: Rotorheads
14th Apr 2021, 23:49
Replies: 15
Views: 3,140
Posted By IFMU

I played around with the 4 axis controller in the...

I played around with the 4 axis controller in the sim at Sikorsky a bunch. From what I remember it was very hard to not cross couple even with all the fancy control laws. Some of the Sikorsky...
Forum: Rotorheads
14th Apr 2021, 17:09
Replies: 15
Views: 3,140
Posted By IFMU

Fixed, thanks.

Fixed, thanks.
Forum: Rotorheads
14th Apr 2021, 13:12
Replies: 15
Views: 3,140
Posted By IFMU

I don't know about the 53, but they definitely...

I don't know about the 53, but they definitely did that on the Sikorsky SHADOW. The concept didn't work all that great. The Comanche had no pedals, just a sidearm controller and collective. All of...
Forum: Rotorheads
27th Mar 2021, 03:02
Replies: 188
Views: 47,862
Posted By IFMU

Correction: BBDSEs outsourced the build of an all...

Correction: BBDSEs outsourced the build of an all electric Schweizer 300 and it never flew. Maybe they outsourced it to the wrong people. Or maybe they should have not oursourced it, and used the...
Forum: Jet Blast
24th Mar 2021, 15:21
Replies: 3
Views: 683
Posted By IFMU

Looks like a new sub-forum. ...

Looks like a new sub-forum.
https://www.pprune.org/space-flight-operations-58/
5th Mar 2021, 13:08
Replies: 207
Views: 22,126
Posted By IFMU

They are using liquid hydrogen now? What...

They are using liquid hydrogen now? What happened to the methane?
4th Mar 2021, 16:56
Replies: 207
Views: 22,126
Posted By IFMU

Hard to accept this as a failure. What is the...

Hard to accept this as a failure. What is the current mission? I'd say the mission is to develop the technology. At this stage you learn more from a failure than a success. And each flight has had...
Forum: Jet Blast
18th Feb 2021, 00:15
Replies: 1,249
Views: 73,475
Posted By IFMU

Similar story here, but 4 owners and 5 cars, plus...

Similar story here, but 4 owners and 5 cars, plus 3 motorcycles. The value of all my vehicles is less than 20,000 even considering the sailboats.
Forum: Jet Blast
31st Jan 2021, 13:32
Replies: 161
Views: 11,677
Posted By IFMU

I've had two issues with a modern car: 1) If...

I've had two issues with a modern car:
1) If locked with the key fob it must be opened with the key fob, else the horn sounds and the car is disabled.
2) The plastic cam cover eventually warped and...
Showing results 1 to 25 of 1000
 


 
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