Wing Frequency measuring app

On Saturday, 5 March 2016 08:39:05 UTC+11, wrote:
I have written an app that measures wing frequency - currently available for Android on the Play Store he https://play.google.com/store/apps/d...j.ios.wingfreq.

An IOS version will be available once I jump through the various hoops Apple places in the way.

Video of it in action he https://youtu.be/dBJOBxGWtCQ.

Clyde.

There is absolutely no difference in measured wing frequency whether done on a cradle or main / tail wheel skid or wheel. Try it out before you write otherwise. - Rolf
Rolf

On Sunday, March 6, 2016 at 2:03:36 PM UTC-8, wrote:
On Saturday, 5 March 2016 08:39:05 UTC+11, wrote:
I have written an app that measures wing frequency - currently available for Android on the Play Store he https://play.google.com/store/apps/d...j.ios.wingfreq.

An IOS version will be available once I jump through the various hoops Apple places in the way.

Video of it in action he https://youtu.be/dBJOBxGWtCQ.

Clyde.

There is absolutely no difference in measured wing frequency whether done on a cradle or main / tail wheel skid or wheel. Try it out before you write otherwise. - Rolf
Rolf

So can I assume before you posted that you checked every glider in existence, on every cradle imaginable, and at every tire pressure?

On my Schleicher at least, the builder has called out some very specific jacking points for this procedure.

On Monday, 7 March 2016 09:03:36 UTC+11, wrote:


There is absolutely no difference in measured wing frequency whether done on a cradle or main / tail wheel skid or wheel. Try it out before you write otherwise. - Rolf
Rolf

I have tried it out - and have seen differences. One in particular was 135 on the wheel and 141 on the cradle. That's not a huge difference, but enough to warrant a closer look, so consistency in technique will help avoid false alarms.

Clyde

02:27 07 March 2016, wrote:
On Monday, 7 March 2016 09:03:36 UTC+11, wrote:


There is absolutely no difference in measured wing frequency whether
done
on a cradle or main / tail wheel skid or wheel. Try it out before you
write
otherwise. - Rolf
Rolf

I have tried it out - and have seen differences. One in particular was
135
on the wheel and 141 on the cradle. That's not a huge difference, but
enough to warrant a closer look, so consistency in technique will help
avoid false alarms.

Clyde


Suggest instead of opinion - just use the MM for the glider. e.g. ASG29 MM
para
3.2 gives the support points. MFG data sheet at build gives original
frequency,
MM7.1 requires annual check, MM7.2 requires it after hard landing, gives
tolerance.

Good clear info from Schleicher, which all ties together nicely imho.

And a very nice app from Clyde, thanks. Like a lot of great ideas it seems
obvious
now but you thought of it.

At 07:23 07 March 2016, Steve Thompson wrote:

Suggest instead of opinion - just use the MM for the glider.

A very good suggestion. Did a Twin Astir wing frequency check the other
week, and that was off by 5 compared to the last measurements. Turns out it
somewhat unusually should sit on its wheel and skid (12th item of the
annual checklist in the mainenance manual) not on threstles, with a
specified tyre pressure of 2.5-2.8 bar. Remeasured and it now was bang on.
The way you measure DOES matter.