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  #11  
Old 07-10-2014, 12:24 PM
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PerfTech PerfTech is offline
 
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Quote:
Originally Posted by Brantel View Post
Allan,

Email sent but for the sake of everyone else considering this product:

Do you recommend 1 or 2?

What is the price and availability?

Do you have any claims to share regarding how they helped cooling in your testing?

The linear actuator will be in a hot environment, what kind of rating does it have for this application?
... We only did our testing with one "EZ Cool Flap" installed, so can only attest to those gains. In a hard extended climb (80Kts. I was seeing 425 CHT without the flap and 400 with it open on my RV-9A. On the RV-7s we saw 20 to 25 degrees reduction as well, depending on the climb speed chosen. The cowl differential pressure goes up on average 24% with the flap opened so it is passing considerably more air. I don't want to mislead anyone by talking about temperatures they will see as every installation is different. I am quit certain that two of these will do considerably more than one but without measuring the cowl pressures I don't know exactly how much. I will say that about 30% of the orders so far have been for two, so apparently I need to gather that information.
... The linear actuator isn't rated by the manufacturer for the potential temperatures it can encounter. No one in our testing program has had a problem as of yet. We placed some actuators in our heat treating oven at 220 degrees and cycled them 1000 cycles with no failures. I would recommend the product be installed on the side of the cowl with the most heat shielding from the exhaust. Perhaps where the heat muff is etc. The radiated heat is the area of concern, like after landing and taxiing. One should try to shield away the radiated heat if possible.
... We made this first run of this product producing 100 units with pricing of $369. We posted the video last night and e-mailed the people that had requested notification when the parts were available. The sales have been pretty incredible to say the least, with over half sold by 11;00 AM today.
... We do not have this product on our main page yet but will try for tomorrow when our resident computer guy is here. I only posted the video so people could see we were making progress and see the actual item. Please just bear with us as all will smooth out with answers to everyone's questions etc. Regards all, Allan...
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  #12  
Old 07-10-2014, 12:28 PM
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Brantel Brantel is offline
 
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Thanks Allan and thanks for your reply to my email. I sent you another one in return....
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RV-10, #41942, N?????, Project Sold
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  #13  
Old 07-10-2014, 12:33 PM
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greghughespdx greghughespdx is offline
 
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Quote:
Originally Posted by BoilermakerRV View Post
You could go full tilt and create a closed loop control system that would position the cowl flap based on CHT!
That's borderline brilliant. Who's going to do it first?
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  #14  
Old 07-10-2014, 12:41 PM
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Quote:
Originally Posted by greghughespdx View Post
That's borderline brilliant. Who's going to do it first?
Not that application specifically, but I am in the design stage on a closed-loop controller to open & close an oil cooler shutter based on oil temperature. It wouldn't be a stretch to adapt it for that.
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  #15  
Old 07-10-2014, 12:51 PM
Randy Randy is offline
 
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Thanks Allen for another great looking design. This is perfect for my new to me RV6A as it just moved to the desert country from the Northwest and she is having some issues with the 100 + degree temps that are so very rare up in the Seattle area.

I look forward to install two of these units and seeing some effect.

Randall Crothers
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  #16  
Old 07-10-2014, 12:53 PM
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Brantel Brantel is offline
 
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Quote:
Originally Posted by BoilermakerRV View Post
You could go full tilt and create a closed loop control system that would position the cowl flap based on CHT!
Quote:
Originally Posted by greghughespdx View Post
That's borderline brilliant. Who's going to do it first?
Quote:
Originally Posted by DaleB View Post
Not that application specifically, but I am in the design stage on a closed-loop controller to open & close an oil cooler shutter based on oil temperature. It wouldn't be a stretch to adapt it for that.
That would be super easy to do with one of the modern EFIS/EMS units and an Arduino... You could sniff the serial stream from the EFIS/EMS and parse out the CHT variables and use either the servo library or the PWM output to drive the linear actuator (special order option on the actuator)....
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Brantel (Brian Chesteen),
Check out my RV-10 builder's BLOG
RV-10, #41942, N?????, Project Sold
---------------------------------------------------------------------
RV-7/TU, #72823, N159SB
Lyc. O-360 carbed, HARTZELL BA CS Prop, Dual P-MAGs, Dual Garmin G3X Touch
Track N159SB (KK4LIF)
Like EAA Chapter 1494 on Facebook
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  #17  
Old 07-10-2014, 01:08 PM
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RVbySDI RVbySDI is offline
 
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Quote:
Originally Posted by Brantel View Post
That would be super easy to do with one of the modern EFIS/EMS units and an Arduino... You could sniff the serial stream from the EFIS/EMS and parse out the CHT variables and use either the servo library or the PWM output to drive the linear actuator (special order option on the actuator)....
RITFLOL!!! If ever there was a sentence written that proves that NERDS (whether computer, electronic, airplane, or any other type) speak a different language than a normal person this is it!
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  #18  
Old 07-10-2014, 01:13 PM
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rv7boy rv7boy is offline
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Quote:
Originally Posted by Brantel View Post
<SNIP>You could sniff the serial stream from the EFIS/EMS and parse out the CHT variables and use either the servo library or the PWM output to drive the linear actuator (special order option on the actuator)<SNIP>
Man, oh man, Brian, I just love that "engineer talk." No jesting, just noticing you slipped into your work mode.


P.S. Looks like Steve had the same thoughts as I did. I was distracted and didn't hit the "Submit" button before he did.
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Last edited by rv7boy : 07-10-2014 at 01:15 PM.
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  #19  
Old 07-10-2014, 02:15 PM
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What are the dimensions Allen? The -8 cowl is not very wide in that area...
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  #20  
Old 07-10-2014, 02:26 PM
krw5927 krw5927 is offline
 
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Quote:
Originally Posted by rv7boy View Post
Man, oh man, Brian, I just love that "engineer talk." No jesting, just noticing you slipped into your work mode.


P.S. Looks like Steve had the same thoughts as I did. I was distracted and didn't hit the "Submit" button before he did.
Uh-oh. I didn't flinch when I read Brian's post. What does that say about me?
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