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I did not build but oil cooler is on the right side of the Cowl and vented to the outside which I suspect makes the temps higher. A& P who put the motor together says oil temps below 215 are good as it boils out any water in the oil.
Anyone have an opinion on either issue? John Morgan |
Counter sink the cowl
I'm installing a couple cowl flaps and was thinking about using some Tinnerman washers and screws to fasten them to the cowl. Can I countersink a honey combed cowl enough to seat the washer or will that compromise the cowl/structure in some way?
Allen's video suggests that simply epoxying the flange to the cowl is sufficient since the internal pressure exceeds the ambient pressure. Is that also true when the cowl is open? Seems that there would be some moment at the aft portion of the flange that would want to separate the flange from the cowl. Dale |
I first used a button head screw and washer, but even though I packed the edge of the honeycomb with resin/micro, the part by the screw crushed a bit.
I wanted a nicer smooth look so I went with the countersunk screws. I took out the button screws and made a very careful slight countersink with a dremel grinding tip (gotta watch the honecomb will cut fast) and used a tinnerman and flat head screw and it came out fine. Put a little resin/micro in the countersink area for strength to prevent more crushing. |
ASA Cowl Flaps
I installed two flaps in my RV7 (IO-360-Horiz Induction). Cooling is now a non issue in all conditions I've flown since install. I did have a motor go out, (replaced, no question).
I did find that there was a bit of clearance interference with the electric fuel pump when the starboard flap closed. I didn't take that into consideration when I chose the mounting spot. I trimmed/filed down one side of the flap edge and gave myself a bit more clearance. All is good now. I also put aluminum tape over the wire and the actuator thinking it may protect things from heat. Will it help? Time will tell. Overall, I'm glad I did it. |
Cowl flaps ASA and VPX sport
Hello,
I plan to install two cowl flaps ASA in my RV7 finished from 3 years, and I would like to connect them with my VPX sport but I only have one port available. So is it possible or not ? in advance thank you for your reply Sylvain |
It should be fine
I would contact Allan with that question, but you should be fine. I?m not using a VPX but both of my cowl flaps will operated via the same circuit and controlled with one toggle switch.
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VPX
Hello Brantel,
Did you connect your cowl flaps on a specific port or a normal port ? Chad from Vertical Power just said me it is impossible to connect cowl flap on a VPX because there is only one specific port for the Flaps but nothing for another device. Or perhaps the VPX Pro is different than the VPX sport ? Thank you Sylvain |
Regular flaps....not cowl flaps.
I?m sure Chad is referring to the regular flaps...not ?cowl flaps?. If he said that there?s only one port for them, I?m sure he just misunderstood you. I had the VPX on my other airplane and I remember there being one specific pin to connect them to to operate the flaps.
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VPX diagram
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I misunderstood your post. I only fed the DPDT switch (similar to a flap or trim switch) with power from one of the VPX circuits. I do not ?control? the cowl flaps with it. Again, sorry for the confusion! |
Yes the way Brian has the switch wired works...and yes I was referring to the flap circuits being the only way to "control" a motor.
Cheers, Chad |
port protected ?
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Yes, that is the way to wire an appropriately rated switch to control output power.
Yes, the VP-X will protect the wiring. Set the breaker value to the appropriate level for the current expected. Set the pin to always on. |
Thank You
Thank you very much Chad, its help a lot !
Cheers Sylvain |
Question On ASA Cowl Flap Actuator and VPX
The VPX installation manual on Page 16, Paragraph 4.12 states to not use the VPX to power linear actuator motors that have a possibility of binding at the end of their travel.
I also am planning to use an ASA cowl flap and VPX, and have been wondering about whether this is an issue, especially with a very low current device like the ASA actuator. Is the ASA cowl flap actuator the type the installation manual is referring to? I seem to recall a thread a while back where a binding cowl flap actuator caused a problem in a VPX system. What is the thought on this? |
cowl flaps position for cutting
Hello,
I am going to install my cowl flaps and I don't know exactly where to cut my cowl. There is no indication on the A.S.A sheet. I read somewhere 3 inches from the rear of the cowl. Is somebody to help me ? In advance thank you Sylvain |
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flaps. If you can give me a call I am certain I can save you a lot of time and work on your installation. Thanks, Allan... :D . ![]() ![]() ![]() ![]() ![]() |
Thank you Alan
Hello Alan,
Thank you for your message. My english is not very good, so a call should be difficult for me. Is it possible you give me the distance between the rear of the cowl and the cut line. Is it 2 or 3 inches ? in advance thank you Sylvain |
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