VansAirForceForums  
Home > VansAirForceForums

- POSTING RULES
- Donate yearly (please).
- Advertise in here!

- Today's Posts | Insert Pics


Go Back   VAF Forums > Main > RV General Discussion/News
Register FAQ Members List Calendar Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
  #21  
Old 07-10-2014, 04:04 PM
Don Jones's Avatar
Don Jones Don Jones is offline
 
Join Date: Nov 2005
Location: Snohomish, Washington
Posts: 685
Default

Quote:
Originally Posted by krw5927 View Post
Uh-oh. I didn't flinch when I read Brian's post. What does that say about me?
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!!
__________________
Don Jones
Technical Support Manager
Dynon Avionics
CFI-IA, AGI, IGI
RV9-A
Reply With Quote
  #22  
Old 07-10-2014, 05:35 PM
PerfTech's Avatar
PerfTech PerfTech is offline
 
Join Date: Sep 2010
Location: Redlands, Ca.
Posts: 1,406
Default

Quote:
Originally Posted by Ron RV8 View Post
What are the dimensions Allen? The -8 cowl is not very wide in that area...
... 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 & Services
Info@AntiSplatAero.com
Southern California (KREI)
RV-9A / Edge-540
(909) 824-1020
Reply With Quote
  #23  
Old 07-10-2014, 06:15 PM
DanH's Avatar
DanH DanH is offline
 
Join Date: Oct 2005
Location: 08A
Posts: 8,895
Default

Quote:
Originally Posted by Brantel View Post
The linear actuator will be in a hot environment, what kind of rating does it have for this application?
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.
__________________
Dan Horton
RV-8 SS
Barrett IO-390
Reply With Quote
  #24  
Old 07-10-2014, 09:39 PM
PerfTech's Avatar
PerfTech PerfTech is offline
 
Join Date: Sep 2010
Location: Redlands, Ca.
Posts: 1,406
Default 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 & Services
Info@AntiSplatAero.com
Southern California (KREI)
RV-9A / Edge-540
(909) 824-1020
Reply With Quote
  #25  
Old 07-11-2014, 07:38 AM
DanH's Avatar
DanH DanH is offline
 
Join Date: Oct 2005
Location: 08A
Posts: 8,895
Default

Quote:
Originally Posted by PerfTech View Post
... 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...
__________________
Dan Horton
RV-8 SS
Barrett IO-390
Reply With Quote
  #26  
Old 07-11-2014, 08:21 AM
Davwol Davwol is offline
 
Join Date: Feb 2005
Location: SD
Posts: 15
Default

What is the difference in cruse performance with door open as compared closed.
Reply With Quote
  #27  
Old 07-11-2014, 08:54 AM
Steve Melton's Avatar
Steve Melton Steve Melton is offline
 
Join Date: Apr 2011
Location: Cincinnati, OH
Posts: 2,270
Default 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.
__________________
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.

www.rvplasticparts.com
Reply With Quote
  #28  
Old 07-11-2014, 09:08 AM
David Paule David Paule is offline
 
Join Date: Dec 2009
Location: Boulder, CO
Posts: 4,001
Default

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
Reply With Quote
  #29  
Old 07-11-2014, 09:14 AM
BCP Boys's Avatar
BCP Boys BCP Boys is offline
 
Join Date: Oct 2011
Location: Kennesaw, Ga
Posts: 723
Default

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.
__________________
Amir
----------
RV-7 - My Ferrari in the sky
RV-10 - Partnered with a good friend

Supporting VAF since the first visit
Reply With Quote
  #30  
Old 07-11-2014, 09:20 AM
rocketbob's Avatar
rocketbob rocketbob is offline
 
Join Date: Jun 2006
Location: 8I3
Posts: 3,359
Default

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.
__________________
Bob Japundza CFI A&PIA
N55BC RV-6 borrowed, 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.
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 08:10 AM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.