PaulChapman

PaulChapman

Lives in United Kingdom United Kingdom
Joined on Mar 19, 2010

Comments

Total: 69, showing: 1 – 20
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On challenge Propeller driven Planes (5 comments in total)

....and what about the turbo-props? These are jet engines driving propellers....generally on quite big flying machines.

Link | Posted on Oct 30, 2015 at 09:12 UTC as 2nd comment
On photo Get Low DP in the Get High or Get Low challenge (8 comments in total)

impressive

Link | Posted on Sep 13, 2015 at 18:17 UTC as 2nd comment | 1 reply
In reply to:

Paul Boddie: "so that commercial planes can eventually travel at much higher speeds"

Although this is valuable work, one cannot help feeling that the legislative barriers are greater than the technical ones, at least until some corporate contributor to various lawmakers' re-election campaigns has a product ready that they want to sell.

The problem is not only the overpressure but also the exhaust effluent (NOx) that does not wash out in the upper atmosphere....above 60k ft....same for the space rockets....does us no good at all.

Link | Posted on Aug 28, 2015 at 18:45 UTC
In reply to:

ray tracer: Ah nostalgia! Student days taking schlieren images of wedge profiles in a shock tube, then off to the darkroom to process our 35mm film.

yes, did the same in the '60s ..... Department of the Mechanics of Fluids at Manchester. Happy Days...read all about it in Liepmann & Roshko's "Elements of Gasdynamics"

Link | Posted on Aug 28, 2015 at 18:41 UTC
In reply to:

iAPX: I would like to see people in the leica lens group when they read that, with such a low price! Lol!

I have Leica and M43 and they complement each other very nicely, especially as relatively compact travel cameras. I have the 21mm F1.4 Summilux which is a very fine lens on the Leica M, even though it is a bit pricey. What is nice about the Voigtlander series (have the 25mm) is the close focus capability...that is very attractive. Would like to see some photos taken with it.

Link | Posted on Apr 3, 2015 at 20:24 UTC

I have been to the exhibition twice...not on the computer but at the Grant Bradley in Bristol. It is a wonderful (free) exhibition where you can take your time and learn. Not everything was particularly to my taste but that is not unexpected...but you can still learn processing technique....or composition...or both and more. The great thing about the exhibition in real life is that you are limited to the Mk.1 eyeball for resolution...so no pixel peeping. My only gripe, if any, was that only the winning three carried their stories. I wanted to read about them all.

Link | Posted on Feb 3, 2015 at 22:55 UTC as 2nd comment
On photo DSC_0125_BW_large2 in the Museums of Flight challenge (8 comments in total)

Wonderful...I have memories (and a Bolex 8mm cine film) of a pair flying in incredibly close formation at Farnborough in the 1970s. One of my favourite aeroplanes.

Link | Posted on Jan 2, 2015 at 16:20 UTC as 3rd comment
On challenge -Dumb Ways 2 Die- (Full Colours Only + Border ) (8 comments in total)

Is this not insulting to people who are unable to speak?

Link | Posted on Dec 8, 2014 at 22:52 UTC as 6th comment | 2 replies
On challenge Up in the air (11 comments in total)

Good challenge, some really excellent images....thanks for hosting. One or two KAP points that are not a whinge/excuse.... Firstly the challenge of framing from a distance without feedback...ok, a lot of people use monitors now; and secondly the technical challenge of creating a panorama from images collected from a bobbing, bouncing platform....that is very difficult.

Link | Posted on Dec 4, 2014 at 09:24 UTC as 2nd comment

I was quite excited by this until I saw the image quality. Which is a pity. Could be a good idea if the IQ was a lot better.

Link | Posted on Oct 23, 2014 at 15:23 UTC as 16th comment | 2 replies
On photo Clifton at Night in the Bridges at night challenge (3 comments in total)

Isambard would be proud of that! Interesting to see the trace of an EasyJet dropping into Lulsgate Bottom.... Congratulations.

Link | Posted on Sep 7, 2014 at 09:57 UTC as 1st comment
On photo WOH_9540 in the Supersonic challenge (2 comments in total)

Great photo...with the shadow of the tail in the condensation pattern....well subsonic though and the condensation occurs due to local airflow expansion, rather than compression....that is why it is at the rear of the wing. The pattern clearly shows the local loading on the aeroplane.

Link | Posted on Apr 18, 2014 at 09:21 UTC as 2nd comment
On photo Bang ))) Boomerang ! in the Supersonic challenge (1 comment in total)

Looks like a Hawk to me.....subsonic trainer....whoops!

Link | Posted on Apr 18, 2014 at 09:13 UTC as 1st comment
On photo HIMARS6-X3 in the Supersonic challenge (2 comments in total)

Probably the most interesting shot....timing is nice with the head fittings blowing off. How was the shot triggered? I also thought Mach 6 at point of exit a bit optimistic....hypersonic is still supersonic by my way of hearing! All, or nearly all, the aeroplane shots show condensation "shocks" so are very nicely subsonic; funny how a bit of water vapour causes confusion!!.

Link | Posted on Apr 18, 2014 at 06:50 UTC as 1st comment
On photo Red Kite Apogee in the Mid-flight challenge (8 comments in total)

Great image showing natural aerodynamics at work... Congrats!

Link | Posted on Apr 13, 2014 at 09:54 UTC as 5th comment
On article Lomography launches Russar+ for L39 and M mount cameras (120 comments in total)
In reply to:

abortabort: Rangefinder coupled?

Does it matter at that base aperture and focal length? Street lens that you set up beforehand and point and shoot. Maybe that is where the Art is?

Link | Posted on Apr 11, 2014 at 08:49 UTC
On photo Race Day in the Motion Blur challenge (4 comments in total)

Yes it does look suspicious....can you explain how the photo was taken?

Link | Posted on Mar 18, 2014 at 21:08 UTC as 1st comment
On photo Vintage motion blur - Wall of Death Rider in the Motion Blur challenge (2 comments in total)

Excellent shot....the sepia does it well.

Link | Posted on Mar 18, 2014 at 12:23 UTC as 2nd comment
On article Judge strikes down fine against drone photographer (132 comments in total)

You need a licence to operate commercially in the UK, but that is for large UAVs. The smaller model ones that carry something like a GoPro are not licensed but the resolution is not wonderful. I use one for kite aerial photography....but it has to be done responsibly otherwise the authorities will react. I suppose in the US it is all about who can/cannot gather data.

Link | Posted on Mar 14, 2014 at 09:32 UTC as 51st comment | 2 replies
On photo Antique Aircraft in the A To Z - Letter A challenge (1 comment in total)

nice

Link | Posted on Jan 31, 2014 at 00:14 UTC as 1st comment
Total: 69, showing: 1 – 20
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