Tag Archives: piston

Prop Effects When Using a Phone

Rolling shutter is a phenomenon that has become very apparent with the widespread adoption of digital sensors in cameras. The way in which a sensor scans across its surface means that relative movement can result in the position of objects being different at the end of the scan than the beginning. DSLRs used a digital sensor but a mechanical shutter so weren’t terribly susceptible to this (except when in video mode) but phones and video camera like GoPros have been.

Usually, if I am photographing aircraft with props, I am using my main cameras. (While I now exclusively use electronic shutter on my bodies, the read speed of the sensor is sufficiently high that the rolling shutter effects are barely visible. However, I rode my bike to Popham one Saturday and decided to grab a few pictures with my phone while I was there. The resulting shots have props that are clearly suffering badly from rolling shutter. It is not something I normally get so I actually found it rather funny. That wouldn’t be the case if I had desperately wanted the shot.

Turbulent Times

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If you are only used to airliners, light aircraft can look pretty flimsy. They are well designed, but they are small and a little flexible looking. They might be more than up to the task but, to a first timer, they might have the impression of being a bit risky. Then you can look at a Druine Turbulent. That takes the idea of simple to a new level. It is a home-built design that first flew in 1951. Small, light, powered by a small engine and with an open cockpit, it seems like even fitting in it might be a bit snug.

One was parked on the field at Popham one Sunday when we swung by to get some lunch. In due course, the owner came back to the plane and headed off. He had to hand swing the prop himself, so the aircraft was chocked while he started it up. The chocks were then stowed in a panel behind the seat and he climbed in and taxied out. Take off was not startling but still reasonably swift and he climbed out en route. What a cool little plane. I wonder whether it is a cost-effective way of flying.

Generations of Provost

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RAF Cosford provided a perfect venue to have a demo from an old RAF Jet Provost T5. As the home of part of the RAF Museum collection, they have the original Jet Provost which is currently stored at Cosford outside the museum building. Looking at this airframe on its stalky undercarriage, you can see that not a lot was changed when adding the jet engine from the original Percival Provost. I saw one of these flying at Old Warden last year.

The later versions of the JP had a more optimised approach. The airframe was tweaked and the undercarriage was shorted considerably. With the need for prop clearance, there was no need for long undercarriage and, I imagine, it was probably really inconvenient for boarding and servicing. The JP3, JP4 and JP5 have their differences but they can clearly be seen to be of the same basic design. Having two of the three on one day was an interesting comparison.

Europas With Varying Numbers of Wheels

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The Europa is a type I got attached to when my friend Sean had one. I was living in the US when he got it, but I used to come across for work on a regular basis, and we would often take the time to go for trips. It was a fun little thing to fly in with quite a turn of speed. The cockpit was very compact which was tricky when lugging a chunky camera around but not the end of the world! Recently, I made a couple of short visits to Popham Airfield and came across a couple of Europas.

The first was parked up and it is a Europa XS which is a later version fitted with tricycle undercarriage. It is a nice-looking aircraft, but it loses the novelty factor that the Europa Classic had. It has a mono wheel arrangement with outriggers to support it on the ground. The wheel, outriggers and flaps are all controlled together so, when you retract the flaps, the gear comes up. One had just landed when we got there and was getting some fuel. Fortunately, they took off before we left so I got a good look at it as it got airborne. A quirky but cool aircraft for sure.

A Fuji and a Bolkow

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When hanging out at a small airfield, you expect to get a bunch of the regular light aircraft types. Cessnas and Pipers will be expected. Popham has a good selection of microlights and autogyros as well so that will mix things up. However, it brought a couple of planes during one weekend that really caught my eye. These are not rarities, but it is still cool to see something a little different. One was a Fuji FA200. I have caught these a bit in the past, but this was a nice surprise.

Then there was something that I genuinely had no idea about. I got some shots of it and then, when I got home, got on the internet to check out the registration to see what it was. A Bolkow BO.209 Monson was the answer. Bolkow was a manufacturer I was familiar with both from its earlier days and then being part of MBB building helicopters and part of the Panavia consortium building Tornado. I was not aware of the Monson before searching for this plane and found that 100 of them had been built by MBB before production ceased. There have been times when resurrection of production was tried but without significant success. What a cool looking plane and I hope I see it again.

A Pitts with Extra Oomph

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When I was a kid, the Pitts Special was the pinnacle of aerobatic aircraft. Then, the arrival of a bunch of high-powered monoplanes like the Zlin Z50L showed up follow by Extras, and the Pitts became more the preserve of individuals getting into aerobatics. It can still make a good display platform, though, and plenty of souped-up versions are on the air show circuit. The Cosford show included one flown by Rich Goodwin that has been modified with a pair of turbine engines mounted on each side of the fuselage.

This makes for a lot of noise and plenty of extra power. The piston engine still does the majority of the work but, when going vertical, the jets are fired up and give a major boost in performance. That can include hovering in place if required. From some angles, the plane is hard to notice as being any different to any other Pitts. However, from the right angles, the engines are conspicuous. A pretty cool display act. I assume top speed is constrained by the original airframe limitations so not much point in using the jets unless pointing upwards.

Floatplanes with Mark

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Let’s jump back in time to when we were still in Washington. My buddy, Mark, had come down from Vancouver to visit a friend and had some time to kill so was stopping off in Kenmore to photograph some floatplane activity. I headed over to join up with him since it is fun to see a friend and there is never a bad time to watch floatplanes.

An extra was that Mark knew a spot that I didn’t – local knowledge, huh?? There is a public dock that is accessible and has benches to make hanging out relaxing. It is a lot quieter than the pier at Log Boom Park which, on a sunny day, can get very busy with the local kids swimming. It also brings you in closer to the approach path of the planes which adds some options for the shots. We hung out for a while with a bunch of the usual sort of traffic coming and going. Then we each had places to go. Having a location like this on your doorstep was definitely a bonus when we lived in Woodinville.

An Early Generation of Anson

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When the announcers at the RAF Cosford Airshow said that an Avro Anson would be displaying, I have to admit I was not terribly interested. My assumption was that it was the same example I had seen flying at Old Warden during shows last year. Nothing wrong with that display but I wasn’t super psyched by it. However, that was not the plane. Instead, this was an early model Anson.

It had flown in from Czechia in the hands of its owner. RAF Cosford has a strong historical link with the Czech Air Force, so this was something they were keen to highlight during the display. Because it was an operational rather than training Anson, it was wearing camo. The display really made good use of the plane. It kept nicely tight in front of the crowd. The angles showed off the plane very well. The framing and windows along the fuselage are quite a curious look and they showed up well with the light behind the plane. It was a good display and a lovely looking aircraft. What a delight compared to my misplaced expectations.

Some of the Weirder Great War Aircraft

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There is a gallery at the RAF Museum at Hendon that is focused on the Great War. This was the early days of aviation, and the development was so rapid that an aircraft might have an operational life of less than a year before something newer and better would replace it. Because so little was known at this point, experimentation with all sorts of ideas took place. Consequently, the types in this gallery have some wildly varying configurations. Pushers and tractors are on show. The sizing of some surfaces is huge compared to what would be expected now. They are really interesting to look at and see what ideas look relevant now and what has been abandoned. Here are some of the various types on display.

The Sun Was Going Away Rapidly!

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Last summer, the evening show at Old Warden included a flight by the de Havilland Comet. It was both in a formation and making some solo passes. The light had been absolutely excellent, but I was getting concerned that the light might be gone before it flew. The bright red paint has the potential to look excellent in very low angle sun, and I wanted to see that if possible.

It started out in a four-ship formation, and I was hoping that they would then do solo performances. Instead, the Comet ended up doing a series of formation passes with the Lysander. This was an interesting combination, but I was hoping to isolate it a bit. With a bit of luck and planning, I was able to get some individual shots that I liked. Sadly, the light was definitely on the way out by this time and, instead of having some gorgeous warmth on a red airframe, things were a little muted. Even so, not a bad thing to wrap up the air show.