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Perhaps your friends here won't appreciate your choice, considering their unaddressed safety-of-flight issue.
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All this stuff.... I'm going to go fly the Champ. :D
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Having been an early adopter frequently in the past, I have a deep and profound respect for successful old technology.
Dave |
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I have a pair coming
Has anyone received theirs yet, and can possibly tell me what is involved with the wiring?
Do they come with wire and connectors? I would not have to ask if I were home with all my tools and building supplies, but out here where I am I need to order in wire etc if needed. Randall in Carlsbad NM Built RV7A and went through 4 Subes... New to me RV6A with all very standard stuff in it:) |
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Sure looks promising and...
I hope the field trials are successful. One very small suggestion though; get the Sham-Wow guy to do your videos.
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I'm confused
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The trend says it's the tip of an iceberg. Let's see what happens as the fleet hours roll up on the whole trifecta...plugged evacuators, stubby HS spar doublers as substitutes for the factory kit, and 50C actuators. |
I liked the video
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Since I have zero experience with these things and the issue at hand, I would prefer to get out of this conversation and stay out. Somehow I got sucked into being the middle man in this conversation and I am out.... I look forward to trying out the cowl flaps which is what this thread is about :p |
50C actuators.
Since temps are no problem in flight, couldn't you just open the cowl flap door after engine shut down till things cool down. I would think there would be a pretty good reverse air flow over the unit. Allen thanks for developing this.
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Might be another thoughts
I dont know why but these is not the first time that Allan launch a new product and get a full investigation to make his products trash.
might be another thoughts... In these case if the actuator fail it is no risk to have a mayor failure. If some body dont like the product dont buy it. |
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This is especially valuable for me when the alternative view is presented with engineering reasoning and facts which is the case here. |
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I was just having a little fun with you. Your video is just fine. You come across as earnest and honest and I don't think the "Sham-Wow" could pull that off. |
i want one!
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Experts
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Just saying. There sure are a lot of opinions around here and you know what they say about opinions!:D |
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braking
is there any braking benefit when opening the cowl on approach?
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Normally with cowl flaps, it's best to keep them closed on approach to reduce excessive engine cooling.
I don't think you'll see any speed reduction at approach speeds. |
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Photos of your cowl?
Allan,
Do you have any photos of the inside of you lower cowl with the cowl flap installed? There are a few variations of Vettermen exhausts produced over the years. Also the heat muffs also vary in location. Do you have photos from some of the beta testers installationsl that might show the cowl flap installed on aircaft with the varying exhaust systems Any images would be helpful. |
Almost Forgot This!!!!
....Here are the pressure differential numbers we gathered on my airplane (RV-9A). These percentages of increases were typical of what was gathered on all the other tests aircraft with stock Vans factory cowl. We installed a second unit and tested the improvement as many people were ordering two and ask for this differential information.
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Alan, You mention "percentages of increase", but these look like absolute numbers. What are the units of pressure measurement?
Roger |
As a user of the anti splat gear leg stiffener and gust lock I am a believer in Alan's products. I also suffer from high CHT's on climb out, but what I would really like to know is what kind of CHT temp drop various RV's are getting with 1 and or 2 cowl flaps. I am looking forward to reports from early adapters of the product before I purchase one or two.
It would be great if someone has them and can report at the Oshkosh beer blast! John Morgan |
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DISCLAIMER: Please make up your own mind as to the value of any product that I review here on VAF. I like to review the products that I buy and use. Typically I tell it like it is and include my likes and my dislikes. In this case I am a guy with a problem keeping his CHT's under control during climbout on hot days and Allan came along and offered a commercial solution to my problem. I am taking the risk of trying his new product by buying/installing/using them and will report my experience here in this thread. As always Your Results May Vary! |
I think that Alan reported a 20-25 degree drop in CHTs in his video using one cowl flap.
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DISCLAIMER: Please make up your own mind as to the value of any product that I review here on VAF. I like to review the products that I buy and use. Typically I tell it like it is and include my likes and my dislikes. In this case I am a guy with a problem keeping his CHT's under control during climbout on hot days and Allan came along and offered a commercial solution to my problem. I am taking the risk of trying his new product by buying/installing/using them and will report my experience here in this thread. As always Your Results May Vary! |
Got my cowl flaps from Allan today and started the install. Pics to follow when I am done but the units are very well made and all the parts are precision cut. If the actuator can old up to the temp, I see no reason why the aluminum parts of these things won't last the lifetime of the airframe.
I do have a minor but solvable issue with the fact that my cowl is thicker than what was expected by about 0.030". My cowl is of the early pink cowl time frame if that matters. I decided to seal up the edges of the honeycomb with some epoxy/micro mix and that is curing overnight. DISCLAIMER: Please make up your own mind as to the value of any product that I review here on VAF. I like to review the products that I buy and use. Typically I tell it like it is and include my likes and my dislikes. In this case I am a guy with a problem keeping his CHT's under control during climbout on hot days and Allan came along and offered a commercial solution to my problem. I am taking the risk of trying his new product by buying/installing/using them and will report my experience here in this thread. As always Your Results May Vary! |
Here is the measurement of the thickness of the blank I cut out of the bottom of my pepto pink cowl:
![]() Found the flatest spot in the cowl to install and stay on the honeycomb area for consistent thickness. Should clear the exhaust easily. ![]() I used epoxy and micro mixed up thick as peanut butter and filled the exposed edges of the honeycomb where the cuts were made. Let that cure overnight and then went back and filed/sanded it all smooth. I then painted the edge to match the cowl and to seal it all up. This worked out very well. ![]() ![]() Painted the flaps to match the cowl. ![]() Here you can see what is almost the end result. I plan to use some stainless 6-32 button head screws to make it easy to remove if I need to for maintenance. ![]() ![]() ![]() As you can see the cowl is not perfectly flat in this area but it is not as bad as the digital camera makes it appear in pics. It seems the design of the units will accept a certain amount of curvature and they also will pull the cowl a little bit and the combo of the two makes it a OK... I decided that I am not going to mess around with trying to make the surface of the flap match exactly the surface of the cowl. It is close enough for me and to apply a fix may not be worth the effort. More to come as progress continues.... DISCLAIMER: Please make up your own mind as to the value of any product that I review here on VAF. I like to review the products that I buy and use. Typically I tell it like it is and include my likes and my dislikes. In this case I am a guy with a problem keeping his CHT's under control during climbout on hot days and Allan came along and offered a commercial solution to my problem. I am taking the risk of trying his new product by buying/installing/using them and will report my experience here in this thread. As always Your Results May Vary! |
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Good report
Anxiously awaiting the flight test data/report.
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Allan's going sell a ton with the help of your photos.
Nice job Brian. Your photos make me want to order two right now. Can't wait to see the results.
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