Tag Archives: testbed

Honeywell’s Convair is Back

Sabreliner Testbed

The Sabreliner is a neat little jet under normal circumstances, combining as it does the wing of the Sabre with a fuselage for passengers. This example, that now lives in the Evergreen Aerospace Museum in McMinnville Oregon, is even better because it is a testbed. The nose has a new radome grafted into place to allow the testing of different radar. Meanwhile, pods can be mounted under the wings to test a variety of different sensors and electronics. Some of these different configurations are displayed alongside the airframe. Good to know that after years of specialized service, the aircraft will survive in the indoor comfort of the museum.

Has the Catfish Escaped Me? NO!

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The first Boeing 757 built was kept by Boeing as a test aircraft and never went to an airline. When Boeing became a partner in the F-22 Raptor program, a new use was found for the aircraft. It was fitted out as a flying testbed for the avionics suite. A test crew could ride in the cabin and they could try out a number of different configurations of software changing things as they go without having to have the software flight qualified.

To make the whole ensemble work appropriately, the aircraft was fitted with F-22 sensors. This included a radome on the aircraft nose with the F-22’s radar. In addition, because a number of sensors were embedded in the wings, a wing structure was added about the cockpit. This unusual configuration resulted in the aircraft gaining the nickname “Catfish”. It flew a lot during the development program but I only ever saw it on the ground at Boeing Field and then it was partially obscured. I did also look down on it from an airliner approaching SeaTac.

I knew it didn’t fly often but I hoped that, in moving to the area, I would finally get to see it airborne. Then I discovered that it had flown to St Louis. The rumor was that it had been retired. Indeed, on a flight across the country involving a plane change in St Louis, I did see it parked up in an open-ended hangar. I figured that might be as close as I got. Then I got a notification that it was heading west again. Better yet, it wasn’t going direct to Boeing Field but to Everett first. It is a short drive from the office to Everett and the flight plan meant it was coming in during lunch.

The harsh lunchtime light and the prospect of heat haze notwithstanding, I figured this was too good a chance to miss. It showed up pretty much when expected so I was able to get some shots of it coming down the approach and across the threshold. The heat haze was really bad as it was over the runway but actually slightly less of an issue further out. I don’t care. I finally got to see it fly and that is what I was after. It headed back to St Louis from Boeing Field the following day. I have no idea when it left Everett for Boeing Field though. If it comes back again and I can see it, that will be a bonus.

AWACS Oddity

Rolls’ Testbed Flies While I Am There – Twice!

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On my previous visit to Tucson, I saw the Rolls Royce owned Boeing 747 engine testbed. This was converted for the Boeing 787 Trent engine development program (hence the registration N787RR). The Number Two engine was removed and replaced with the test engine. The other three Rolls RB211s are unchanged. At various times the testbed has been reported to be without an engine in the test location but there was something there when I was last here – it’s just they didn’t fly. This time was different.

I saw the testbed when I left the airport after my flight landed. The following morning, I headed out to see what F-16 traffic there was and saw online that a flight plan had been filed for the testbed. I only had a certain amount of time before I was due to be at Hawgsmoke but it was supposed to fly long before that. Of course, test flying is not usually something that happens to a tight schedule and the takeoff time came and went. We were beginning to think we might miss it when the sound of some large engines spooling up reached us. A while later, out she came.

Engine testbeds require some careful control. Since one engine is significantly different in thrust from the others, there is a balancing act required to keep the thrust differential within the ability of the control surfaces to overcome. That means the max thrust is not always going to be used. Consequently, they use a good portion of the runway for takeoff rotating just passed our location. That meant I didn’t get the front quarter rotation shot I had in mind.

No matter, I still got to see it fly. The return was about six hours later and I was busy elsewhere at that time. I figured that was it for this trip. I was wrong. The morning of my departure, I had a little time to spare so went back to see what was happening. Amazingly, the testbed was already being crewed as I drove up. We got a repeat of the previous day and some similar shots. I guess I was compensating for not seeing it fly last time!

Northrop Grumman Testbeds

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Every once in a while I am looking for things to include in the blog from previous photographic outings. I was discussing an aircraft with an unusual radar installation which will now show up in an upcoming blog post as well. However, it triggered another thought about some radar testbed aircraft that I used to see quite regularly. For a number of years I was working in Washington DC on a regular basis and I would fly in to BWI airport. Aside from being a popular hub for Southwest, it is also the home of a Northrop Grumman radar plant.

They have a hangar on site which not only deals with their corporate aircraft but also their testbeds for the airborne radar programs. This hangar is located along a tree lined taxiway so everything is pretty obscured from view (unless you are airborne when you can see in a lot more clearly). The two testbeds that I saw quite frequently were a Sabreliner business jet and a BAC 1-11 airliner. The 1-11 was a regular sight when I was a lot younger but now they are almost all gone. Therefore, this was the one I was always pleased to see.

Sadly, I often saw them when I was without a camera or the camera was away. No electronics below 10,000’ in those days. However, I did catch them occasionally so these shots are a reminder of what was there. I suspect that the 1-11 is no longer in use. I imagine it was becoming a pain to maintain but I don’t know for sure whether it still is around. If you know, please do tell me.

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