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Search: Posts Made By: Arnie Madsen
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Forum: Rotorheads
3rd Jun 2019, 00:08
Replies: 12
Views: 4,028
Posted By Arnie Madsen

Another one that history overlooked for a long...

Another one that history overlooked for a long time was Jacob Ellehammer from Denmark . Around 1913 he was flying his co-axial helicopter .... his was not the first helicopter of course but he...
Forum: Rotorheads
29th May 2019, 02:14
Replies: 12
Views: 4,028
Posted By Arnie Madsen

Thanks for that .... I have always been very...

Thanks for that .... I have always been very interested in helicopter history and have most of the books written through the years.

A good book was written by engineer William Hunt who worked with...
Forum: Rotorheads
7th Sep 2018, 03:23
Replies: 76
Views: 11,716
Posted By Arnie Madsen

When I look at the picture I keep thinking...

When I look at the picture I keep thinking someone forgot to properly fasten the skid assembly to the bottom of the fuselage ..... I cannot see any damage other than blades when it slipped on it's...
Forum: Rotorheads
19th Jul 2018, 03:54
Replies: 3
Views: 1,697
Posted By Arnie Madsen

https://cimg1.ibsrv.net/gimg/www.gmforum.com-vbull...

https://cimg1.ibsrv.net/gimg/www.gmforum.com-vbulletin/1316x715/uptigrove2_d80670312bd27b052186a025d1dd185129014df5.jpg
.

Sad news. His helicopter design has a good safety record .
(Rumor of a...
Forum: Rotorheads
11th Jul 2018, 03:48
Replies: 21
Views: 3,029
Posted By Arnie Madsen

. Regarding above photos ...... Anyone wanting...

.
Regarding above photos ...... Anyone wanting further reading go to this helicopter pilot history blog ....... partway down the page is the link for the Pete Peterson (free) PDF book ..... some...
Forum: Rotorheads
11th Jul 2018, 03:32
Replies: 21
Views: 3,029
Posted By Arnie Madsen

This is my favorite From Pete Peterson...

This is my favorite

From Pete Peterson (free) PDF book .... "A Flying Story"
...
Forum: Rotorheads
17th Jun 2018, 22:55
Replies: 32
Views: 17,673
Posted By Arnie Madsen

Condolences to all .... I have a question .......

Condolences to all .... I have a question .... what do they use a helicopter for on a "fish farm" ? .... Our fish farms are enclosed and serviced by boat etc . . (ps: I know what helicopter fish...
Forum: Rotorheads
5th Jun 2018, 03:09
Replies: 28
Views: 21,923
Posted By Arnie Madsen

I agree ... at least as far as discussions here...

I agree ... at least as far as discussions here on this forum .... speculation and guesses (as to the cause) of any incident can be a healthy exercise that stretches our brain to consider all the...
Forum: Rotorheads
6th Sep 2016, 20:13
Replies: 5
Views: 3,313
Posted By Arnie Madsen

There is a major powerline crosses the river in...

There is a major powerline crosses the river in that spot (it was reported they hit the lines) . Sad news
Forum: Rotorheads
8th Jul 2016, 12:20
Replies: 2
Views: 3,217
Posted By Arnie Madsen

Good one .... even better is to see one take off...

Good one .... even better is to see one take off vertical .... haaaa .... I have , -20*f , 50 mph steady wind , straight up , De Haviland Beaver
Forum: Rotorheads
6th Jul 2016, 04:33
Replies: 1,918
Views: 1,455,420
Posted By Arnie Madsen

My thinking too ... the other day I pulled some...

My thinking too ... the other day I pulled some numbers out of the air .... fleet of 200 machines X 8 planetary gears = 1,600 gears .... changed every couple thousand hours there could be way over...
Forum: Rotorheads
20th Jun 2016, 03:34
Replies: 1,918
Views: 1,455,420
Posted By Arnie Madsen

That is the type of info we need, thanks I...

That is the type of info we need, thanks

I am a layman and speak as a layman but when a chip is produced in a MRGB it is not because a gear is too soft but because it is too hard (brittle)
...
Forum: Rotorheads
17th Jun 2016, 09:33
Replies: 1,918
Views: 1,455,420
Posted By Arnie Madsen

No , they were industrial bearings but if I could...

No , they were industrial bearings but if I could get a bunch of time expired MGB gears I would sure beat them up to see how brittle or malleable they are.
Forum: Rotorheads
17th Jun 2016, 07:05
Replies: 1,918
Views: 1,455,420
Posted By Arnie Madsen

Inner bearing races and outer bearing races are...

Inner bearing races and outer bearing races are made from hard brittle material and can easily be cracked with a moderate blow from a hammer or dropping it or whatever. I have seen mechanics remove...
Forum: Rotorheads
6th May 2016, 03:38
Replies: 1,918
Views: 1,455,420
Posted By Arnie Madsen

re: suspension strut pins .... whether loose ,...

re: suspension strut pins .... whether loose , wrong size , or retaining clips missing I cannot see them falling out in flight ..... they are carrying +20,000 lbs and you could not drive them out...
Forum: Rotorheads
9th Apr 2016, 09:53
Replies: 163
Views: 39,005
Posted By Arnie Madsen

. Arthur Young was doing this stuff in the...

.

Arthur Young was doing this stuff in the 1930's https://en.wikipedia.org/wiki/Arthur_M._Young#/media/File:Model_helicopter_being_controlled_by_its_creator_Arthur_M._Young.jpg
Forum: Rotorheads
24th Feb 2016, 01:33
Replies: 87
Views: 28,925
Posted By Arnie Madsen

. Watch the video at 25% speed and you can...

.

Watch the video at 25% speed and you can see the pilot kept it upright for a while after splashdown ... when the blades did start to hit the water they were still at max pitch and glanced back...
Forum: Rotorheads
20th Feb 2016, 05:19
Replies: 87
Views: 28,925
Posted By Arnie Madsen

. I am just making guesses like everyone...

.

I am just making guesses like everyone else and I keep leaning toward VRS because how else could it drop so fast .

VRS could also explain the rpm increase because of unloaded blades and...
Forum: Rotorheads
19th Feb 2016, 06:19
Replies: 87
Views: 28,925
Posted By Arnie Madsen

. Gotta be VRS ... high hover , low speed ,...

.

Gotta be VRS ... high hover , low speed , probably a wind shift to boot .... watch the yellow police tape behind the guy in the second video (post 7) ... wind shifts 180* several times ...
Forum: Rotorheads
19th Feb 2016, 04:30
Replies: 87
Views: 28,925
Posted By Arnie Madsen

. VRS ??????????????????

.

VRS ??????????????????
Forum: Rotorheads
17th Feb 2016, 20:38
Replies: 84
Views: 25,487
Posted By Arnie Madsen

. Canada did the same with the Avro Arrow ......

.
Canada did the same with the Avro Arrow ... it was a Mach 2 Interceptor way ahead of its time ... built 6 and then the government decided to scrap it.

Most of the engineers ended up going to...
Forum: Rotorheads
15th Feb 2016, 22:13
Replies: 84
Views: 25,487
Posted By Arnie Madsen

. I still think the Fairey Rotodyne could...

.

I still think the Fairey Rotodyne could fulfill a category somewhere between standard helicopters and the highly technical and exotic Boeing V-22 Osprey

The Fairey Rotodyne is fairly simple...
Forum: Rotorheads
29th Jan 2016, 02:53
Replies: 129
Views: 21,945
Posted By Arnie Madsen

. SilsoeSid ... you remind me of the guy who...

.

SilsoeSid ... you remind me of the guy who goes to the airport and opens his hangar door.

The rule books are stacked to the ceiling but there are no aircraft .

.
Forum: Rotorheads
22nd Jan 2016, 16:39
Replies: 129
Views: 21,945
Posted By Arnie Madsen

SilsoeSid I dont have time to watch all the...

SilsoeSid I dont have time to watch all the videos right now .... the guy is not a crazy cowboy flier , he even cut the path thru the trees in case he had to auto when leaving his yard.

The low...
Forum: Rotorheads
22nd Jan 2016, 16:25
Replies: 129
Views: 21,945
Posted By Arnie Madsen

Yes ... that would seem obvious , but I think an...

Yes ... that would seem obvious , but I think an overspeed without load would be using much less fuel than an overspeed under maximum load .... something like that .... a computer makes some...
Showing results 1 to 25 of 144
 


 
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