Archive for the ‘Flight Testing’ Category

2011 19 Jun

Besides giving passenger Marc the mandatory RV-Grin (which i’m lead to believe will have a lasting effect ;-) we tried to trace the source of the aerodynamic vibrations in the cabin floor. It’s hard to compare it to other airplanes and is definitely not bad, but in the longterm, less vibrations is always better for the airframe.

For that purpose, we taped some small tufts to the cowling and mounted a gopro digital video camera to the right gear wheelpant.
One thing that is evident from the videos is that the “Louvers” cooling aides in the bottom cowl work perfectly while the vibration most likely is generated by the current shape of the cowl outlet around the exhaust/nosegear mount. Already thinking about possible mods.

Short video with the tufts zoomed in.

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Landing on RWY26 at LSZF (Birrfeld)

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2011 6 Jan

Finally, the weather cleared up after a lenghty phase of more or less unflyable weather. And when it was VMC, i was sure to work… Anyway, this 2 hour flight paid for all the idling last month… After some cruise performance tests, a short recon of Arosa (where we’ll go on a short snowboard break) i had planned to fly back to Birrfeld… Upon crossing the CTR of Altenrhein (LSZR), by pure coincidence, Chrigi Keller was taking off with their RV-6A HB-YKD… Had plenty of fuel, so let’s go for some pictures ;-) Unfortunately i was by myself and had left the camera at home.  Thanks to Chrigi for once again some awesome pictures of YMT in the air. That makes him the unchallenged leader in YMT air to air photography ;-)

2010 22 Nov

Went to Langenthal (LSPL) to have the prop dynamically balanced. With the help of G. Staude (AIRLA Maintenance) we got the engine/prop from a fari 0.25ips to around 0.01-0.04 ips :-)

2010 22 Nov
2010 13 Oct

Approaching 30hrs!

Weather has been up and down recently, but we did get to fly during some awesome  days.

Did the first oil change at 25hrs, not a problem.

Unfortunately, we did miss chapter D noise certification by about 1dB. We will certainly give it another try for chapter D next spring, but first we have to do proper analysis about where and how we can improve. So for now, we’re in chapter C, which essentially means slightly higher landing fees but other than that no major impact.

2010 12 Sep

Yesterday, we took part in the Noise Measurement at Grenchen (LSZG). Luckily, we have been progressing smoothly through the flight test phase, so we were ready for this already. There are only two events each year, one in spring and one during fall. The noise measurement is a mandatory requirement before eventually being able to get an unrestricted flight permit and being able to travel throughout Europe. The results aren’t out yet, though. Will be very interesting to see and also hoping for the quietest category D, in order to burden lower landing fees.
Also, if we miss significantly, this might mean having to reengineer the whole exhaust/muffler issue or even change props. But let’s hope this remains a worst case scenario.

Also, some great pictures from a few recent flights.

2010 23 Aug

Just a short update and to apologize for the delay with videos and other reports…

We simply have been too busy flying :-) Something like 8 hrs in the last week… With all the planning beforehand and data evaluation afterwards, this amounts to quite a bit of work (although i hate the word “work”… it’s more like “fun”, but leaving little time for other stuff like screening and cutting videos)…

The RV-7A flies great and is everything we hoped for (and more…)

2010 7 Aug

This is the first set of promised pictures and videos. There will be more coming.
Photos by: Markus & Christian Keller, Richard Bätscher, Michi Wellenzohn. Thanks guys.

2010 4 Aug

We’re proud to announce that our RV-7A succesfully flew its maiden and second flight today at Birrfeld (LSZF) airfield in Switzerland.
The awesome event was captured by several cameras, so expect an update soon, featuring pictures and video.

The feeling is beyond description and so worth every minute it took to get there!
Both flights went perfect, with the landings being nice and maingear first but flying can still be improved by a little earlier rotation and more flare at touchdown.

First flight was flown by Bernie, followed by cowl removal / inspection and a second flight with building partner Alex as “flight test engineer” ;-)

The only squawks were a seeping oil cooler fitting (which didn’t show up during various ground runs and only lost a few drops of oil overall) and an aileron trim that went to max right once, which we suspect could be related to control stick wiring.

check back for an update in the following days. will post pictures and videos as soon as they’re gathered and ready.

rgds from RV-grinning
Alex & Bernie

UPDATE: Here’s a teaser image with the famous RV-grin immediately after the first flight with Bernie and Alex cheering. Bear with us for just a little longer until we get all the great pictures and videos collected and processed.

Picture by RV-10 builder Michael Wellenzohn