Shock Cooling Detection

[n223rv]

Can you set up shock cooling detection in the SkyView? I looked in the manuals, rev H and could not find any reference to it. I know my D180 had it, but can't seem to find it in the SkyView. Am I overlooking it?

Thanks
-Mike Kraus
RV-10
43 hours
Still wanting audible alarms and downloadable engine monitoring capability....

 

[dynonsupport]

Hi Mike. You're not overlooking it. It's not there yet. We'll get there though.

 

[preid]

Is this still in the "coming soon" for EMS features?

 

[dynonsupport]

See above.

 

[preid]

Let me rephrase- is "shock cooling" something we'll see sooner or later? Where is it on the priority list?
Thanks!

 

[dynonsupport]

We no longer keep a static "priority list". Instead, we regroup between releases and prioritize the features for the next release, and then there's everything else that doesn't make it. We have priorities on the major product pushes, but smaller features like this get implemented in bits and pieces, in each release, roughly in response to customer demand and what we think will make the most amount of customers happy with the direction of the product overall. We've yet to regroup for the deep 3.3 feature planning, so it's hard to say for sure. But it's probably not in the 3.3 release, and beyond that, it's honestly hard to say.

 

[preid]

Bringing up this topic again. Is it still in the works?
Thanks!

 

[dynonsupport]

Still on the list, but hasn't made the cut yet.

 

[klindell]

Any news here?
Waiting to prevent cracked cylinder heads...

 

[TRCsmith]

"Given the available data, it strongly suggests "shock cooling" is nothing but a myth, at least in the context as commonly explained.
Kas Thomas, a respected aviation engine expert and author believes, "shock-cooling is not a major contributor to cylinder head cracking".
Since many people do not run their engines correctly (eg. they run at CHTs that are way too hot), shock cooling can become a problem if, for example, you run at 460 CHT and go full rich and bring the throttle to idle. If you run your engine sensibly, though, it's never an issue.
All the other explanations fall down when you ask why cylinders don't crack due to shock heating, on takeoff.
Or why the cylinders don't self-destruct when you fly into rain.
Nonetheless, the topic will remain highly controversial and surely continue to be hotly debated well into the future".

For me in a LongEZ with a O-320 it's a non issue. I also don't need another light flashing or warning with a voice telling something I should already be aware of. If you believe shock cooling is a problem then you should know how to control or prevent it just like you've done before Dynon came on the market.

Lots of info on Shock cooling on Google
1. http://en.wikipedia.org/wiki/Shock_cooling
2. http://www.avweb.com/news/maint/182883-1.html?redirected=1

 

[klindell]

In my application, as glider tow-plane, it is an issue...

 

[TRCsmith]

Kalle, what plane do you use as a glider tow?  Curious about what procedure you used before Dynon came along. 

 

[klindell]

Just some procedures and still do.
Unfortunately sometimes also these: http://www.aircraftspruce.com/catalog/eppages/superiormillenium08-11750.php?clickkey=31253

Would like now to get more info to the pilots, same thing than get rid of steam gauges.

 

[kellym]

Just some procedures and still do.
Unfortunately sometimes also these: http://www.aircraftspruce.com/catalog/eppages/superiormillenium08-11750.php?clickkey=31253

Would like now to get more info to the pilots, same thing than get rid of steam gauges.

Hmm, I think you are still barking up the wrong tree. Jump aircraft don't have history of shock cooling problems, and they climb up to 14,000, then chop power and dive at max speed back to ground for another load.
I suspect shock heating from too rapid application of throttle for takeoff is more likely the issue.
If you are running fuel injection, over torquing injectors is another source of cracks.
I know if the feature is added, it is one I will turn off. On engine analyzer on my certified aircraft I just set the alarm to a value the cylinder can't achieve unless something is really wrong, because I don't want useless alarms.