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-   -   ASA New Product Video is up! (July 2014) (https://vansairforce.net/community/showthread.php?t=115072)

Brantel 07-11-2014 08:29 AM

Quote:

Originally Posted by BCP Boys (Post 896536)
Dan H brings up a good point on the temp. I love the design and believe it will help a lot of folks but the "in-flight" temp may not matter much do to the airflow, I'm more concerned about the temp after engine shut down. The test results that I would like to see is MTBF when temps are in the 300F range and if/when the electronics within the actuator fail. By no means I'm beating down this wonderful design, just hoping to understand more about it and maybe even help drive future options/upgrade considerations.

I intend to put in some radiant heat shields on the exhaust and to cover the actuator with reflective foil tape where possible. Hopefully the actuator is spec'ed well above the actual power needed for the job to help offset the temp concerns. If these things can help my RV provide better climb performance without sacrificing top end speed significantly, I am going to try em....

The positive results posted by Dan and Ken around their own designs and tests and the testing Allan has done looks promising. I have no idea if this actuator will live in the environment for a 1000+ hrs or not but I will let you know how it goes. :p In the event of poor service life, Allan's setup could easily be converted to some other home brew actuator that could be designed from the start for high temps.

LifeofReiley 07-11-2014 08:39 AM

Quote:

Originally Posted by Brantel (Post 896545)
I intend to put in some radiant heat shields on the exhaust and to cover the actuator with reflective foil tape where possible. Hopefully the actuator is spec'ed well above the actual power needed for the job to help offset the temp concerns. If these things can help my RV provide better climb performance without sacrificing top end speed significantly, I am going to try em....

The positive results posted by Dan and Ken around their own designs and tests and the testing Allan has done looks promising. I have no idea if this actuator will live in the environment for a 1000+ hrs or not but I will let you know how it goes. :p In the event of poor service life, Allan's setup could easily be converted to some other home brew actuator that could be designed from the start for high temps.

And the Experimental Spirit is ALIVE again. Thanks Brantel, you made my morning! :)

RVbySDI 07-11-2014 09:02 AM

So how much does this actuator cost? It does not appear to me that this is a "critical to safety" item. If the actuator does give up the ghost at some time in the future and it fails open, or closed, what consequences are there? If the flight can continue with the door open, or closed, at the expense of a few lost knots of speed, or higher temps, is that a critical problem? If not, then if the actuator does fail why could one not just purchase a new actuator and be on his way again?

Brantel 07-11-2014 09:06 AM

Quote:

Originally Posted by RVbySDI (Post 896564)
So how much does this actuator cost? It does not appear to me that this is a "critical to safety" item. If the actuator does give up the ghost at some time in the future and it fails open, or closed, what consequences are there? If the flight can continue with the door open, or closed, at the expense of a few lost knots of speed, or higher temps, is that a critical problem? If not, then if the actuator does fail why could one not just purchase a new actuator and be on his way again?

About $70...

I am thinking along the same lines as you!

Pmerems 07-11-2014 09:19 AM

Aircraft use?
 
I think Allen is on the right track. One concern is for "aircraft use". I use a commercial spring in my dimpling tool. Originally the manufacture not sell it to me because they thought it was going to be used in an airplane. After I explained it was for use in a tool they sold it to me.

If Allen's design takes off, purchasing thousands of actuators might raise a red flag. Hope it doesn't.

Brantel 07-11-2014 09:31 AM

Quote:

Originally Posted by Pmerems (Post 896572)
I think Allen is on the right track. One concern is for "aircraft use". I use a commercial spring in my dimpling tool. Originally the manufacture not sell it to me because they thought it was going to be used in an airplane. After I explained it was for use in a tool they sold it to me.

If Allen's design takes off, purchasing thousands of actuators might raise a red flag. Hope it doesn't.

The good thing is that these actuators are sold by dozens of re-sellers for the typical robotic hobbyist. I doubt we are gonna draw too much attention.

flightlogic 07-11-2014 09:58 AM

I am thinking of this mod for the 9A. Actuator cost seems very reasonable. Heck, oil filters are not cheap and we throw them out.
Climbing steep is good for a variety of reasons.
Letting the heat out a big hole... sounds like a new idea.... no wait, my old Cessna 180 had a big hole that I could adjust. Wasn't that in the days of Bonanza and the Ponderosa ranch. Good job Alan...

Brantel 07-11-2014 10:23 AM

Quote:

Originally Posted by dhc2jeep1 (Post 896589)
It could always be converted to a manual cable actuator like older airplanes have.

Yes but those are a pain in the rear to rig in a way that makes it easy to get the cowl on and off. Doable but a pain....

David Paule 07-11-2014 12:20 PM

My C-180, with manual cowl flaps, uses an AN392 or 393 clevis pin and an AN416 safety pin. There's enough room with the cowl flap open to reach in with one hand and remove or reinstall the hardware.

Works great.

Dave

DanH 07-11-2014 06:41 PM

Quote:

Originally Posted by LifeofReiley (Post 896550)
And the Experimental Spirit is ALIVE again.

http://youtu.be/S3SKXfEMSYY


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