No. Polyurethane tanks are not available as a replacement. There were some that went inside the old fiberglass (wingtanks.com) 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.
I have one installed fibreglas tank (1999 SKystar Kitfox Classic IV and the other tank is removed and the wing covered...... think both tanks have that Kreem sloshing compound..... Are new poly tanks available to just replace these with rather than mess around trying to clean and reslosh them???
Greg, I talked to you on the phone one time and that was to try to get Jodys Skytrax adapter to work with your one way clutch and your clutch wouldnt work purely dimensionaly. I could of went online and posted to everywhere that looky here everyone his stuff doesnt work it was dimensional incorrect but i didnt just because i figured you werent familar with my adapter and you needed to work out the bugs. Now looking back on this situation thats exactly what you would have done. We never discussed all the things that you supposedly "taught" me. I shared with you my plans for the future (Apex gearbox) and some of my thoughts and you shared some of your insights. I kind of that at the time that we were sharing knowledge to collectively make this yamaha redrive thing better for everbody. Now that you have out right lied about multiple things on our correspondence among other things i will never talk with you on the phone or work with you to solve somones redrive problems. I am reluctant to do this because everone suffers but I can not allow you to slander my reputation and not for fear that i wont sell somthing to someone. I have met so many great people just making these little parts as a side hobby and there is no reason that someone should make up such things about me. You have allready started talking bad things on my new Apex gearbox and i havent even started the testing phase yet. I have high hopes for it but who knows testing could reveal all kinds of flaws and i could end up with a pile of scrap for the metal bin but one things for certain I wont be offering any for sale until i prove that they are a good alternatve. I am very interested in who had any failures of my adapters. To my knowledge there has been none with the exception of a oil weep on a few adapters and I am aware of one rotax c gearbox bearing failure (Steve Henry) that happened after 100 hours and it was not catostrphic he noticed excessive play in the clutch drum on preflight. We attributed this failure to the type of lubrication used and possible damage during a gear change out. He is now up to about 350 hours many of which flying at wot during competitions and 180 hp for take offs using nitrous. I am aware of his rubber rotax hardy disk coming apart but thats not to say one cant use the these ive used one my plane for over 200 hours now with no issues. Plus that is not a catostrophic failure either since the c box is design to eject the rubber pieces out the large holes in the side and continue to drive the 2 couplings by direct contact. I am not making any claims that this setup will go for thousands of hours because its an unkown and I am unwilling to make up fake facts but at this time but it seems to be working pretty good so far. I would be happy to discuss any and all failures that you know here on this forum. We owe it to anybuilder considering one of our PSRU options. I however wont get in a debate with you on your skewed engineering data. I hardly have enough time as it and i dont want to use what little i have in negative arguments its not productive for anybody.
A speed wing may not be the best choice for off field landings. Higher stall speed and such. I've put about 450 hrs on a Jabiru engined equitp Avid Flyer. Before serial # 450 may be good to stay away from and the early hydraulic lifter engines (somewheres after #1850 or so. Latest engines seem to be very good. I have a solid lifter engine # 903. JImChuk
Adam, If you have an instructor willing to teach in your plane it makes the most sense to buy your own plane to learn in. Why pay rental fee that you will never get back. The instructor probably will require dual brakes and will have to fly your plane solo for XX hours before he can instruct in said plane unless he already has time in that make and model I think. I could be wrong, but I know that has been an issue for some in the past. Either way, I think it was 3-5 hrs the instructor needed when I checked into it for a float rating. As Jim said each looks at a plane differently. Some may never consider putting a gorilla tape patch on a plane.. I don't have an issue with it There is a difference between safe to fly and being anally perfect. Growing up flying here in AK I have seen and flown a lot of really tired beat up planes that most lower 48 pilots would never dream of getting into so my views are a bit skewed. Bottom line is, I would see if there is an EAA guy in the area that would check it out for you if you cant find another Avid driver close. I know some damn good AP around here that don't want anything to do with the experimentals because they are just too busy to take the time to learn what is acceptable for an EPX versus the certified they have been dealing with for 40 yrs. Not that they are scared to work on or fly them, they just don't fully understand us being able to do mods etc without a stack of STC's and red tape they are used to having to deal with.
Hi Jim, Joey, Vance, Thanks so much for the feedback. This forum is so helpful. A bit about myself, I am new to flying. I have taken about 8 hours of flight lesson on a Champ so far. I liked low and slow kind of flying, and the idea of being able to land off-field really appeals to me. So I have set my eyes on Avid and Kitfox, and planned to buy one after I got my light sport license on the Champ. Things does not quite go as planned. The champ I am taking lesson on had an accident and is totaled (on ground accident, and luckily nobody is hurt). So I am facing a choice of continuing my lesson on C172 or I am thinking moving my purchase plan forward. So here are the aircraft I am considering, https://www.barnstormers.com/classified_1259058_Avid+MK+IV+Speedwing%2C2008+ELSA.html Since it is in Southern Cal that's fairly close to San Diego, so I have contacted the seller and got some pictures. I am thinking about come up to take a look. I'd love to get some help from you guys. Am I crazy buying an airplane at this stage of learning to fly, or should I go with the C172 to get my license first (it will have to be a private license on C172 and takes longer)? I am mechanically inclined and consider myself pretty handy (being fixing my car for many years, playing around with lathe, mill, etc., built my own CNC router, 3D printers). But for my work schedule, I probably don't have much time to work on the airplane at this time, so I am definitely looking for something ready to fly. What I like about this Avid is that it has 4-stroke Jabiru engine, and seems to be in good condition. It is built in 2008, and the seller told me that he is the 3rd owner. 145 hrs is a bit low, but the seller told me that he has another airplane and is looking at getting rid of one. Also, it is close enough that I can trailer it home since I don't have a license to fly it. Your ideas and thoughts are very much appreciated. Adam
Jared, I think I can ship you 4 used Matco MC4 brake cylinders for $200. They don't have the fork at the top end, but have a hole in the rod end, so you have to make a fork on your pedals to make them work - not a big deal. You probably need to study the 2.5 : 1 ratio (pedal height to attachment tab length ratio) that makes them work best - I think it is on the Matco site. Or, get some info from others here. Most everyone on here has had to modify their pedals and MC attachment tabs to get better brakes. C5Engineer's pedals are not the factory pedals - they are modified. I have several sets of MCs - got to check inventory. EDMO
One thing about a pre buy, especially on an experimental, is everyone sees things differently. What might seem just fine to one person may not be to another. I've changed things on every experimental I've owned after I got it home. They had flown for varying amounts of time the way they were, but I didn't like them that way myself. JImChuk
Haha, Joey beat me to it. If you go this route, another neat trick is to paint a black edge on the inside of the window face maybe 1" or so in from the frame edge all around under where the frame tubing will mate. Also under the horizontal brace tube. This will literally make the tape disappear, provide a nice sharp outline and eliminate any aesthetic uglies like inadvertent wiggles due to less than straight tape application or other install difficulties. That tape gives you one shot at positioning the plastic, it is very sticky.  Or I suppose you could use white paint, dunno if the tape would show thru though.
Joey, I figured you would respond before I told you....lol. I never know when to text you when you are out of town. Adam, Joey is correct. I bought an Avid from California last June. I had another friend do a prebuy inspection on it and it was determined to be in close to flying condition. I hauled it home and set in to cleaning and inspecting. To make a long story short I finally got that plane in the air three weeks ago after four months of fixing little stuff I found. There are a lot of factors to consider when buying what we refer to as a “Barn Find or Hangar Queen”. Ill shoot you my email and phone number. If you want to know more send me an email or call me. Vance
When I mounted the windows on my recent Avid rebuild, I put some foam weather stripping on the tubes and then attached the lexan. I have a few extra holes in the doors, and they were hidden by the foam. Foam was 1/8" x 3/8". Probably cost me about $5 to do both doors. I drilled the holes in the lexan, clecoing the holes as I went along, and when all the holes were drilled I chamfered the holes, applied the foam to the doors, and then put the windows in place. I just used gray foam, but maybe you could find white. They do sell a double sided white foam tape that is made sticky on both sides, but it cost a good bit more than the weather stripping. JImChuk
What's the advantage? Cost? Pretty tough to beat a Matco MC-4D with an intensifier kit. George Happ is pretty smart dude! Heres the set up on my two Avid's. The correct geometry is key to proper working pressure at the caliper. Both of these birds will do full power static run ups with no creep using just brakes.
Please post a link. Beware of pics! You have a lot of homework to do if your seriously considering buying an experimental plane. Unlike their factory built counterparts every single Avid out there is unique and has an unlimited amount of variables. First question. What is it you want to do with the plane and hope to accomplish by buying it? This will set the stage for many other questions. Sorry I'm not trying to make the process too intimidating but your initial post is very very vague. We need to know year built, engine, hours, model, speed or STOL wing, etc in order to help. Joey