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07-10-2014, 03:04 PM
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Join Date: Nov 2005
Location: Snohomish, Washington
Posts: 699
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Quote:
Originally Posted by krw5927
Uh-oh. I didn't flinch when I read Brian's post. What does that say about me?
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Me either, and I am not an engineer and didn't stay in a Holiday Inn last night either!!
Placed my order for one of Allen's units this morning, we will see!!
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Don Jones
Technical Support Manager
Dynon Avionics
CFI-IA, AGI, IGI
RV9-A
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07-10-2014, 04:35 PM
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Join Date: Sep 2010
Location: Redlands, Ca.
Posts: 1,458
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Quote:
Originally Posted by Ron RV8
What are the dimensions Allen? The -8 cowl is not very wide in that area...
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... I'm sorry about that! I completely overlooked that information. The door itself measures 4 11/16" X 6 1/4" and opens 3". Thanks, Allan... 
__________________
Allan Nimmo
AntiSplatAero.com
Innovative Aircraft Safety
Products, Tools & ServicesInfo@AntiSplatAero.com Southern California (KREI)
RV-9A / Edge-540 
(909) 824-1020
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07-10-2014, 05:15 PM
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Join Date: Oct 2005
Location: 08A
Posts: 9,500
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Quote:
Originally Posted by Brantel
The linear actuator will be in a hot environment, what kind of rating does it have for this application?
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50C, or 122F.
http://www.firgelli.com/Uploads/L12_datasheet.pdf
FWIW, I've measured cowl exit temperatures as high as 209F. Measured an upper accessory area temperature of 175F just a few weeks ago. And I tried a
Firgelli L12, and replaced it when it developed freeplay.
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Dan Horton
RV-8 SS
Barrett IO-390
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07-10-2014, 08:39 PM
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Join Date: Sep 2010
Location: Redlands, Ca.
Posts: 1,458
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Actuator Type
... The actuator we are using in not the L-12 but is instead an L-16. The L16 is a slightly larger version of the L12 with a bigger motor for faster speeds and handles heavier loads. These are actually manufactured in china with different component parts being made by several suppliers. We are told that this motor will handle higher temperatures. Thanks, Allan... 
__________________
Allan Nimmo
AntiSplatAero.com
Innovative Aircraft Safety
Products, Tools & ServicesInfo@AntiSplatAero.com Southern California (KREI)
RV-9A / Edge-540 
(909) 824-1020
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07-11-2014, 06:38 AM
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Join Date: Oct 2005
Location: 08A
Posts: 9,500
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Quote:
Originally Posted by PerfTech
... The actuator we are using in not the L-12 but is instead an L-16. The L16 is a slightly larger version of the L12 with a bigger motor for faster speeds and handles heavier loads. These are actually manufactured in china with different component parts being made by several suppliers. We are told that this motor will handle higher temperatures. Thanks, Allan... 
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Dan Horton
RV-8 SS
Barrett IO-390
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07-11-2014, 07:21 AM
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Join Date: Feb 2005
Location: SD
Posts: 17
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What is the difference in cruse performance with door open as compared closed.
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07-11-2014, 07:54 AM
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Join Date: Apr 2011
Location: Cincinnati, OH
Posts: 2,791
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I like it
I wish I had this when I was out West this Summer. I made some shallow climbs after fuel stops to keep CHTs down. That's not the safest procedure. Vy is a better speed for initial climb. Even if the actuator requires periodic replacement because of temperature exposure I believe it would be worth it.
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Steve Melton
Cincinnati, OH
RV-9A, Tip-up, Superior O-320, roller lifters, 160HP, WW 200RV, dual impulse slick mags, oil pressure = 65 psi, EGT = 1300F, flight hours = 800+ for all
Simplicity is the art in design.
My Artwork is freely given and published and cannot be patented.
www.rvplasticparts.com
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07-11-2014, 08:08 AM
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Join Date: Dec 2009
Location: Boulder, CO
Posts: 4,435
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I wonder if a second one, on the top of the cowl, would be helpful on the ground to cool down the FWF area? It would only be used on the ground.
Dave
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07-11-2014, 08:14 AM
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Join Date: Oct 2011
Location: Kennesaw, Ga
Posts: 825
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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.
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Amir
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RV-7
RV-10 - Sold
Supporting VAF since the first visit
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07-11-2014, 08:20 AM
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Join Date: Jun 2006
Location: 8I3
Posts: 3,564
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One could fab up a NEMA 17 stepper, along with a small 1/4" or so acme screw and nut and be good for 250+ degrees. Using a stepper controller with something like an Arduino one could easily limit travel without any limit switches. Steps per rev times pitch of the screw.
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Please don't PM me! Email only!
Bob Japundza CFI A&PIA
N9187P PA-24-260B Comanche, flying
N678X F1 Rocket, under const.
N244BJ RV-6 "victim of SNF tornado" 1200+ hrs, rebuilding
N8155F C150 flying
N7925P PA-24-250 Comanche, restoring
Not a thing I own is stock.
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