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  1. flywise


    If I was to choose a new engine I would go for the BMW R1200 engine. Parts are a non issue at a reasonable price. Here you have some info about a guy fitting it to a cherry BX-2..

    http://spang-air.de/e/html/bmw_-_engine.html

     

    Price wise you can get them at a good price too...

    https://www.ebay-kleinanzeigen.de/s-anzeige/bmw-1200gs-flugmotor-m-neuen-bleidieselgetriebe/687835651-242-5976

     

    Here a thread on homebuiltpanes.com

    http://www.homebuiltairplanes.com/forums/showthread.php?t=4438

     

     

  2. Buckchop


    Yes how to test the muffer heater is to fly the plane.

    But i was refuring to the english wheel and metal strecher. Still a long ways for flyin the Bluefox 0038, the heater in my Blackfox 0021 works good. 

  3. Allen Sutphin


    I’m running a Simonini Victor 2 since several years without any issues - and I am in contact with serveral owners around the world (but none in the US) with the same positive experience. It is a modern 2 stroke engine but with higher power and lower consumption than 582. Mine give 92hp and consume 13 l/h. This model is no longer sold, the corrent model give 100hp and similar consumption. Same weight as a 582, similar price and the same attachment point (but the shape of the engine might require some modification to the engine mount.

    More info on my blog...

    http://avidsimonini.blogspot.com/

    I would prefer an engine that is available and popular here in the US. Mainly due to parts and service being available without going across the pond. It appears to be leaning to 3 options as of now. The 582, which will go away someday in the near future, the Hirth with its less than stellar reputation, but currently in production, and the Jab 2200 with its shady past that it might have fixed with the newer ones. As it stands now, the 582 is probably the most popular due to gobs of them out there flying and most problems have been dealt with by experience. The Hirth is coming up as a solid replacement but not a lot of owner info out there to go by. But parts and service are available within 4-5 hours from my location. This isn't just my issue, we are all in the same situation sooner or later. The older Avids, Kitfoxes, and many others which can't handle a 912 type engine are going to end up with no available engine choices eventually. Every new airframe kit is based around the 912 or bigger engine which leaves us lighter guys out. Very little work is being done on new lightweight engines for ultralight type aircraft. Maybe I am off the mark, but we all have some skin in this. Unless you are the Trent Palmer type with money or somebody to pay for it .

  4. skypics


    After rebuilding the right caliper that was leaking and rebuilding the right master cylinder I just could not get all the bubbles out of my left double puck system. 

    I filling fron the lower nipple using and oil can with a feed trigger that would then fill the reservour. I tried bleeding it like we do autos by having someone presson the pedal while I open the bleed nipple.

    Nothing would move the bubbles pout of the tube that connects the top caliper to the lower caliper.

    Finally, my friend brought over the system he uses to bleed his brakes on his Kitfox and RV. It is a small garden sprayer. 

    I set it up so any excess on the reservour would go into a recovery bottle. He opened the nipple and pushed the trigger on the sprayer and the fluid moved so fast that the bubbles were moved up and out of the system. This ended several hours of trying to get rid of the bubbles.

    The brakes are now solid.

    I HATE bleeding brakes. 

    John M

    1 person likes this
  5. FredStork


    I’m running a Simonini Victor 2 since several years without any issues - and I am in contact with serveral owners around the world (but none in the US) with the same positive experience. It is a modern 2 stroke engine but with higher power and lower consumption than 582. Mine give 92hp and consume 13 l/h. This model is no longer sold, the corrent model give 100hp and similar consumption. Same weight as a 582, similar price and the same attachment point (but the shape of the engine might require some modification to the engine mount.

    More info on my blog...

    http://avidsimonini.blogspot.com/

  6. FredStork


    The air intake for my muffler heater will have a scoop im building that will b mounted on the lower fiberglass cowl for easy removale and line backup when put lower cowl backon. Here pic of where comes out thro cowl, still building the aluminum scoop on the english wheel and stretcher to mount on there. Hope it works for me,  Hahhaaaaa

    image.jpg

    You know how to test it! ;-)

  7. Turbo


    Welcome, Super-D!  Like Fred says, the guys on this site are friendly, helpful, and knowledgeable.  The Avid rocks, and is inexpensive (relatively speaking) to fly.  You've definitely got a tiger by the tail!  There is so much to learn, and so many ways to build and set up the airplane the way you want.  Each of us tracks a unique path, as we come from many walks of life, ages, and even different countries.  We all share a fascination with the magic of flight, and most are more interested in the flying than actually arriving somewhere.  What is really great is that you can toss out a question to the group, and get back several different answers, or approaches to a particular problem that comes up.  You can then pick the approach you like best, or let those ideas inspire you to your own solution!

  8. Allen Sutphin


    I looked at the BMW and its available in stock form about everywhere. It does require a bit of work to make it aircraft suitable. Dick of RV fame said there wasn't enough time in one's life to design an airframe and an engine, too. I already have the airframe, but I am old and probably not enough time to design an engine or highly modify one. This Kitfox will be a local flyer and not a cross country machine.  1 to 2 hrs max flight time.

  9. Allen Sutphin


    Guys, getting close to having to make a choice on an engine for my light kitfox model 2. Have been considering most available 2 strokes and some 4 strokes, but no clear choices popped up. As it stands right now, the Hirth 55HP 3202 is showing promise but nothing definite. Before I'd go with a 582, I'd consider the Jab 2200 for basically the same weight.  I know a 582 is reliable in most aspects but I'd prefer air cooled if at all possible. Anybody have any solid prospects that comes to mind?  There are some untested good ones out there and some junk as well. Maybe this group has some in mind that I haven't thought of.

  10. Willja67


    You might want to get the Kitfox 4 wings also, they are a fair amount faster:)

    ya know just thinking the drag of the wings might not be a liability. Drag increases as speed increases but the distance between the 2 lines is only 3/4 of a mile so for maybe the first 1/3 of that you're not going fast enough for the drag difference to matter and the last 3rd of it you're trying to slow down to land in the shortest distance possible so now those draggy wings actually benefit you? Yeah sure Draco runs away from everyone at the start and can even slow down and stop pretty good with the reverse thrust but you'll notice the distance is greater and most guys made up some time on him by landing shorter and getting turned around in less space. 

  11. Buckchop


    The air intake for my muffler heater will have a scoop im building that will b mounted on the lower fiberglass cowl for easy removale and line backup when put lower cowl backon. Here pic of where comes out thro cowl, still building the aluminum scoop on the english wheel and stretcher to mount on there. Hope it works for me,  Hahhaaaaa

    image.jpg

    1 person likes this
  12. Willja67


    You might want to get the Kitfox 4 wings also, they are a fair amount faster:)

    Yeah I was wondering about that undercambered airfoil.

    So let's break it down so far:

    Say 7-8k for the engine and prop (just guessing), $4500 for the covering materials (just got a quote last week) say 2k for all the carbon and vacuum bagging materials ( my labor is not counted). I'm putting aftermarket gear on so another grand there, and say another 4k just to round it off  for the mod 4 wings and other goodies with a base price $16,000 plane. So all told about 37k. So we come in less than what he spent on the engine. And it's still iffy. But fun to think about. 

  13. FredStork


     

    Fred if your flying in temperatures around 20 to 32 degrees is that heater sufficient to warm the cabin?  Thanks for your suggestions.

    Well, maybe we should define “sufficient”... as mentioned I would suggest one of the larger models unless you engine is running really hot even below freezing... Mine don’t so the result is not “warm” but rather “less cold”. But as you don’t really start undressing in an Avid the extra degrees are really pleasant and do make a difference.

    But ...to you and Buckchop... if you plan to dry a wet dog a cold winter day this might not be the solution...

    1 person likes this
  14. lv2plyguitar


    Agreeing with Yamma-Fox's comment on "safer" I installed a water heater with an electric fan from T7 Design Thermal Solutions (they have distributors in the US) https://www.t7design.co.uk/products/heating/heaters.html  (~115 USD including VAT)

    heater.thumb.JPG.d68406ad7f0e50ba45fc1a4

    I have the 2.2 kW Micro Heater 12 volt model (1.3 lbs). As my Simonini doesn't get that hot maybe I should have gone with the 3.5kw Lightweight model. And I can confirm that it can be used for cooling in the summer. When it is really hot even my Simonini can get warm and turning on the "heater" brings down the temperature. 
    It is connected via a simple T after the water pump and another T just before the main radiator. No valves, i.e.always open, it is therefore always warm but unless I turn on the fan it doesn't really heat the cabin so no issues in the summer.

    Fred if your flying in temperatures around 20 to 32 degrees is that heater sufficient to warm the cabin?  Thanks for your suggestions.

  15. Willja67


    I'm guessing most of you are familiar with Trent Palmer and his kitfox, which he just installed a turbocharged 141 hp Rotax 915 in. He's dubbed it " cubkiller" since the goal was to outperform the carbon cubs at the Stol Drags at the High Sierra Flyin. Here's his video from the flyin: https://youtu.be/3KS9NkpXShg

    So "Operation Cannibal Fox" is to beat Trent Palmer and his "Cub Killer" in a Kitfox 1 at the Stol drags.

    Right now it's mostly a mental exercise because i lack the funds to do it but i want your input on what it would take. Reason for this is even though "cubkiller" is supposed to be the poor man's way to compete with a 300k carbon cub 40k for a 915 doesn't feel very poor to me. 

     

    Here are my thoughts and the mods i would make to do it. 

    1. Cover in Oratex 600UL for the lightest weight covering possible. 

    2. Carbon fiber vacuum infused cowl and anything else to shave weight 

    3. Install BMW R100 turbocharged engine. 

    4. As many streamlined struts and fairings as possible. 

     

    The biggest one on the list is the BMW R100 turbocharged engine for obvious reasons. It seems to be a proven fact you can get 80 reliable NA horses out of a R100 and i was reading last night about how 100 turboed horses is pretty doable without major mods to the engine and if you want to go for 120 then you have to go with lighter pistons etc and you still might have a hand grenade. But let's just run the numbers on the 100 hp turbo since its the cheapest simplest alternative. 

    My bird weighs in at 468 empty. Let's just say i shed the fat on the airframe and the engine and turbo bring it in at the same weight.  With just me and fuel for the race that's 732 lbs with 100 hp that's a power to weight ratio of 7.3. If I can shed the 35 lbs extra I'm packing even better but we'll plan like that's not going to happen.   

     

    Freedom fox weighs in empty around 930lbs and I'm guessing Trent weighs in about 160 plus 40 lbs of fuel with 141 hp on tap yields a power to weight ratio of about 8.0 lbs/hp. So we've got him on power to weight barely, but he's got a Fadec controlled constant speed prop and mixture control which is probably a huge maybe insurmountable advantage. 

     

    So what do you guys think? Is it doable? What would it take to beat him doing it as  cheap at possible?

  16. Willja67


    It's commencing! Here's the first piece of fiberglass cut for the cowling. 3 more similarly sized large pieces, 4 medium sized pieces, and a few small ones. Advice given to me by a cozy builder in my chapter was never touch it without gloves as the oil in your hands will keep the epoxy from adhering.  I'm also going to weigh each piece of fabric and mix only that much epoxy by weight for it and wet it out on a piece of plastic then drape another piece of plastic over that and squeegee the epoxy out to the edges that way the fabric holds its shape enroute to the cowling then peel the back piece of plastic off and drape it in place.   I'll link to s video soon showing the technique if that was hard to understand. 

    Doing wet layups about the best fiber to resin ratio you can get is 50/50 by weight hence the measuring of the epoxy and fabric. Ive got all kinds of dreams for this plane. Eventually i want to build a carbon fiber vacuum infused cowl for it. If it's anything like the weight saving trent palmer got doing his that's 5lbs more useful load and less nose heavy as well. 

     

    Trent Palmer Cub killer video

    20181109_135745.jpg

  17. marksires


    Heat?  Who needs heat???? Now if someone could come up with a light, cheap air conditioner, I'd jump on it in a second! :P  81 degrees (F) here right now, at noon on 11/9/2018.

    Mark

    Mark, here is a cheap and light air condition for you:
    Avid_open_window.thumb.jpg.d74588b766352

    Fred,

    No doubt!  It is on my list when I finally get around to rebuilding my Avid.  I got my seaplane rating in a J-3, and having those top doors open was wonderful!

    Mark

     

  18. sky4play


    Buckchop… I had a heating system very similar to your pics. The major difference would be wrapping the metal around your exhaust. When I wrapped 

    mine in a foil based heat wrap...what a difference..Then I made my intake into more of a scoop.The heat was actually quite good after that..

    .Now I'm 

    putting in a new motor, new layout....new solutions.

  19. flywise


    I would be against welding a cabin heat shield to your exhaust because there would be no way of inspecting it for cracks....danger of monoxide poisoning 

    1 person likes this
  20. flywise


    Hey Curt,

    I understand you're at a high elevation and have not much useful load there....but looking a little further down the road, if one day you sell or the plane moves closer to sea level it is of GREAT value to have the possibility to fill more fuel.......One of the prime items a buyer is looking at is endurance .  I bought an Avid with 14 Gallons (only one tank in the right wing) and lowered the price because it takes a LOT of work cutting into the wing to ad another tank. I am very limited in range until I add the second tank because the Avid flyer fuel pick up is far from ideal. 4-5 gal in the wing tank is not enough to fly safe as you will constantly feed from your header when banking/climbing & descending...

     

    My 2 cents

  21. Buckchop


    Well u r right Fred about that, guess i just go the extra mile to sealup every airleak i can, im a wimp when comes to gettin cold hahahahahaaaaa to many frozen yrs out workin on equipment in the winter or driving them cross country in winter to a remote mine,