Activity Stream

Activity Stream

  1. flywise added a topic in Avidfoxflyers General Hangar   

    "beefing up / modifying" structures a BAD idea???
    Hi guys,
    I have always wondered how some very talented builders are able to modify primary structures in our light aircrafts....are you all high end aircraft structure designers/engineers??? Have you inputs from Dean Wilson?I have read a good article about this very subject and I would like to have your appreciated comments...
    Everyone who is considering a "beefing up" should read this I believe...
    Cheeers, Laurent
    P.s I would like to ad that this post has absolutely no intention criticizing anyone doing modifications on their birds. I am only trying to figure out if there is / are good ways & tricks to stay safe doing it. 

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  2. Dusty added a post in a topic Mk4 Gross weight   

    I see this aircraft listed as a STOL,so assuming 1150 pound ?it should have storage behind the seat?
    there are some images online (ZK JFR)if that is any help.
    max weight is a consideration as we usually  fly heavy and can have some savage turbulence (no one likes g meters here )
    i hope hope to get a look later this week.
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  3. dholly added a post in a topic Kitfox 4 fuel tank kreem peeling   

    I assume Brett's poly tanks are unavailable, even though is still up. Kinda like his Airdale website, probably left them up with ads to generate a few click-bait pennies. Some folks here retrofitted poly tanks from Stace Schrader at Rocky Mountain Wings (Ridge Runner kits) for their under camber Avid wings, not sure if those would fit the newer laminar profile KF4-7 wing but I suspect so. There is a notable difference for install however, being that the original KF wingtanks did not employ the Avid style installation with fiberglass wrap totally around the spars and tanks. Cutting the tops off and dropping a poly tank inside is not really an option with the original KF slip-in wingtanks, IMHO. If you opt to replace the KF wingtanks with the RR poly tanks, at the very least you will need to add a new short rib between the tanks (assuming you want two 5-gal tanks in a wing). I would also add a ply bottom between the butt-2 ribs and 2-3 ribs, Hysol'd to the underside of the lower capstrips (or maybe better yet to blocks Hysol'd to the rib webs) before setting, gluing and foaming the tanks in place. Should support the weight of a filled tank and provide much needed structural strength.
    [edit] I would add that the install photos on also show support tubes between ribs, not convinced they are critical.
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  4. dholly added a post in a topic Checking out an Avid   

    New student pilot training in an E-AB taildragger WILL be very costly from an insurance viewpoint. Maybe even impossible, as the aviation insurance co's only agree from time to time when they need to add risk to their insured pools to meet required minimums.  The ins. co. WILL require your instructor to have hours in type (10hrs min. in my case, IIRC). I succeeded with a KF3 TD , and then also got reasonable ins. for a KF4 TD before a CFI w/ 10,000hrs bent my Grove gear... which came out of my pocket after the CFI suddenly disappeared. Both EAA and NAFI provide flight insurance to CFI's training in experimental aircraft, I believe that includes their own as well as your aircraft. I recommend you ask if they provide their own ins. that takes precedence over your owner policy in the event of damage when they are PIC. Like many auto ins. co's, one aviation claim can follow you for years and cause higher premiums.
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  5. dholly added a post in a topic Replacing windshield   

    Ed, I'm not 100% sure off hand. I think any old paint is ok if you prime plastic first. Not sure if sanding a bit of tooth is absolutely required though, the adhesion promoting spray primers avoid having to do that, i.e. self etching like you used. I have also seen rattle cans from Krylon and (ironically) Rustoleum that specifically say 'for plastics', so maybe you can use these directly without sanding or priming first. Of course the concern with sanding first is that it might be seen through the plastic when viewed from behind on clear sheet. Then again, maybe that would provide a desireable matt vs. gloss effect? Best to test on scrap first to see which paint/procedure provides the look you like.
    One thing for sure, cleaning the Lexan will be critical. Never use ammonia based cleaners like 409 and Windex on polycarbonate, mild dish soap with warm water only. Cleaner/Polisher works on Plexiglass but not Lexan, so to make sure all surface contaminants were removed I would follow with a wiping of isopropyl alcohol, naphtha or mineral spirits only, taking care to avoid the edge face. Any other solvent will cloud or craze the poly. Then another immediate wash with mild dish soap and fresh warm water rinse. Dry with chamois or other clean non abrasive cloth.
    I've never done this little trick on doors personally, but liked what I saw (might have been pics on TKF forum). Looked very clean with that sharp outline and completely eliminates that unsightly dirt and crud catch all between the window and tubing. That is a pet peeve of mine, no matter what I tried I couldn't get my KF doors totally clean and it really sticks out with the white door frames.
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  6. nlappos added a post in a topic Checking out an Avid   

    A big factor is the useful load, which is of course the difference between the empty weight and the max gross weight. Many car engine Avids have very high empty weight, which limits the useful load. For a typical C model with a 2 stroke Rotax 582,  the useful load might be about 450 to 480 lbs, for a Mark 4 it might be around 580 to 600 lbs. That means two 180 pounders and lots of gas is permitted. There are some auto engined Avids with 350 lbs useful load or even less, which makes it practically a one person airplane..
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  7. Av8r3400 added a post in a topic Wingtips discussion   

    They are very tight lipped on the details of testing and R&D.
    The STi wing is the same span, a very slight increase in chord and quite a bit thicker than the standard Riblett profile. 
    I seem to remember someone saying this was another Ribblett design, but I can't say that for sure. 
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  8. SuberAvid added a topic in Avidfoxflyers General Hangar   

    Wingtips discussion
    Did you all notice that the new KF STOL wing has squared off wingtips with fences plus mid wing fences?  It doesn't took like they lengthened the wings, just increased the chord.  I wonder if they did much performance testing of the wingtips to decide the best for short field performance since KF has used drooped tips and Horner style tips before.  Anyone have insight on this?
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  9. AFlyer added a post in a topic Checking out an Avid   

    Thanks a lot, Jim. I guess I will have to hold on to it for a while before I can get that price.  I will check on the serial number with the seller.
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  10. TSoftware added a post in a topic 912, Late Kitfox Weights and ??? Parts   

    I know that this is a bit old, but here is a reference for the "yellow wired" regulator:
    I put one on my 582 to get rid of the BA capacitor that it had on it when I got it.
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  11. 1avidflyer added a post in a topic Checking out an Avid   

    Hi Adam,  you can send the pics to me in a private email, and I'll give you my opinion.   That and 75 cents will get you a senior coffee at McDonalds.    Do you have the engine serial # as well?  JImChuk
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  12. EDMO added a post in a topic Replacing windshield   

    I know that you can buy cans that say "Plastic paint" too.  I painted some shutters with it and probably screwed up by cleaning with alcohol, and then used a self-etching gray primer before using the Plastic paint - Summer sun caused paint to peal in about 3 years.  I probably should not have used the primer? EDMO
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  13. jared payne added a post in a topic motor cycle brakes?   

    PM sent
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  14. jared payne added a post in a topic Yamaha RX1 Engines   

    Well said Teal. I have a jealous person in my line of work as well, he is my biggest advertizer 
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  15. EDMO added a post in a topic motor cycle brakes?   

    Yes, they are made for dual brakes - need a cheap small reservoir for fluid to keep them full - goes on firewall usually.   I may have a set with forks - got several.   Plumbing for them is simple, but probably on Matco site,.  EDMO
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  16. jared payne added a post in a topic motor cycle brakes?   

    Sounds good and thanks, let me do a little research , need to know if these can be plumbed together.
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  17. EDMO added a post in a topic Checking out an Avid   

    I am usually very accommodating, but my situation and Avid knowledge is not good.  Got to pass on this one.  Sorry.  There are some Avid guys on here who know about Jab engines too - I don't.  No, not Murphy - just Maverick according to some!  ;<)  EDMO
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  18. AFlyer added a post in a topic Checking out an Avid   

    Marverick? Do you mean Murphy Marverick? That's a cool airplane too. Much respect. Maybe you can at least spare a few minutes to take a peek and help me with some ideas.
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  19. EDMO added a post in a topic Checking out an Avid   

    Maybe one of the more knowledgeable Avid guys will take time to do that with you.  I mostly know Kitfox, and I am a Maverick designer / builder anyway.  EDMO
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  20. AFlyer added a post in a topic Checking out an Avid   

    Thanks, Edmo.
    I am not concerned about competition. Indeed, if it is on Barnstomer, it is probably seen by everyone who wants to buy anyway.
    What I was concerned is that those pictures were sent to me by the seller through private communication. So I take those pictures are private for my personal consideration only. I feel comfortable to share with my friends who help me with my decision, but not sure if it is fair to the seller to post this on a public forum for everyone (including those who has not registered) to see. I am just respecting the seller's privacy.
    Sort like a dating game, we can talk and share pictures. I may show those to my friends. But to post it on a public forum is different, which I felt a bit uncomfortable to do though we are not talking about a person here.
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  21. EDMO added a post in a topic Checking out an Avid   

    Adam,  Our "Public" is the around 1200 AFF members spread out all over the world.  Posting here probably wont get you any competition on the buy, but might get you some valuable info from guys and a gal who know a lot about these birds.  We don't always agree, but most have their 2 cents worth to add.  EDMO
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  22. AFlyer added a post in a topic Checking out an Avid   

    I have some pictures that the seller sent me, including one with weight and balance sheet. I am not sure if it is fair to share it in public here. But I can send those in private message to people here who can help me checking if there is something of concern.
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  23. EDMO added a post in a topic Checking out an Avid   

    Maybe it's because of the short wings and Jab engine - like a nose dragger -  some folks don't want what I might like.  I don't know anything about the plane except what has been written here.    EDMO
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  24. C5Engineer added a post in a topic Checking out an Avid   

    That particular airplane has been listed multiple times for sale over the past year. Not sure why but........usually there's a reason. The "good" ones typically sell very quickly.
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  25. Av8r3400 added a post in a topic Kitfox 4 fuel tank kreem peeling   

    No.  Polyurethane tanks are not available as a replacement.  There were some that went inside the old fiberglass ( but I think that venture died with its parent, Airdale. The tanks are structural to the wing and polyurethane doesn't offer the needed strength.
    The new tanks from Kitfox are of a more ethanol resistant fiberglass.  I put these in my rebuild and have been very pleased with them. 
    I had the creamed tanks in my old plane and never had any issue, but watched them closely. 
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