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Activity Stream

  1. dholly added a post in a topic Firewall   

    Jack-

    How thick is your firewall SS in inches please? And, it is 304 SS, right?

    Thanks  [

    I'll be more specific for the metal experts...

    I know ACS recommends/sells .018" (3/16") 304 SS firewall material, but I just found a local line on super cheap 1/8" 316 marine SS.

    Can I substitute 1/8" (0.125") 316 SS for 3/16" (0.18") 304 SS for firewall material?
    316 SS is thinner and stronger, but strong enough?
    Weight difference?

    Thoughts anybody?

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    304 Stainless Steel
    T-304 is the most commonly used stainless in the world. You can find it in everything from forks and knives to backsplashes. It is weldable, machinable with the right techniques, and has good corrosion resistance, but is not for use in salt water environments. This material is hardenable by cold work.

    304 Stainless Steel (annealed condition)
    Minimum Properties    Ultimate Tensile Strength, psi    73,200
    Yield Strength, psi    31,200
    Elongation    70%
    Rockwell Hardness    B70
    Chemistry    Iron (Fe)    66.5 - 74%
    Carbon ©    0.08% max
    Chrome (Cr)    18 - 20%
    Manganese (Mn)    2% max
    Nickel (Ni)    8 - 10.5%
    Phosphorus (P)    0.045% max
    Sulphur (S)    0.03% max
    Silicon (Si)    1% max

    -----------------------------

    316 Stainless Steel
    Also known as marine-grade stainless steel, T-316 is similar in machinability and weldability to T-304, but has far superior corrosion resistance. It has a far higher yield strength than both 303 and 304, meaning that it will not bend as easily. This material is hardenable by cold work.

    316 stainless steel (annealed condition)
    Minimum Properties    Ultimate Tensile Strength, psi    89,900
    Yield Strength, psi    60,200
    Elongation    45%
    Rockwell Hardness    B91
    Chemistry    Iron (Fe)    65%
    Carbon ©    0.08% max
    Chrome (Cr)    17%
    Manganese (Mn)    2%
    Molybdenum (Mo)    2.5%
    Nickel (Ni)    12%
    Phosphorus (P)    0.045%
    Sulphur (S)    0.03% min
    Silicon (Si)    1%
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  2. Russ. added a post in a topic Stewarts System   

    Getting closer to finished.  Painted left wing today.  Only right wing to paint and I can start reassembly.  Russ


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  3. dholly added a post in a topic The more I dig into my Avid, the less it seems like my paerwork is right   

    .069" gussets on rear carry-thru tube. Note the gusset against the hinge pin bushing must be notched to allow the wing to fold. While you're at it, consider adding a .090" center anchor plate for new 4-pt harnesses (with integrated turtle deck stand-off post to help stop rattle), and a new antenna mount just behind the turtle deck fabricated out of .035" sheet.

    For D.I.Y. fuse widening ideas, check out the Kitfox I-IV kit by Murle Williams www.murlewilliamsaviation.com and the Kitfox VII door frame pics at http://www.teamkitfox.com/Forums/album.php?albumid=40.

    With everything else you've mentioned plus oem manual brakes, sure sounds like an A model retrofitted with a removable engine mount to me. IMHO, the stretch makes very good sense if you want to use a heavier engine. I think you'd consider it time well spent, or wish you had done it, after the fact.

    [edit] fixed link


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  4. C5Engineer added a post in a topic Avid rebuild   

    Got my tail on this afternoon. I can't get the inner two hinge pins in though on the elevator. They are just slightly off and by the time you get to the end all it does is just push the bushing back out of the hole. I tried reaming it and trying different combinations of different pins to no avail. I finally gave up. Anyone have any tips for installing the elevator. I put the center pin in first and then then each end. Everything slid together nicely till those two inner pins. I forgot the camera but got these with my phone. Getting closer! Gotta hook up my new compression springs and the linkages and it should be about ready to taxi.




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  5. Trackwelder added a post in a topic The more I dig into my Avid, the less it seems like my paerwork is right   

    Gussets are new. What thickness?
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  6. Trackwelder added a post in a topic The more I dig into my Avid, the less it seems like my paerwork is right   

    Brakes are manual, removeable motor mount looks factory.
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  7. Trackwelder added a post in a topic The more I dig into my Avid, the less it seems like my paerwork is right   

    Where would I find the information on the fuselage widening kit, the stretch is easy and I would eventually like to go with the VW with redrive and if I am front heavy with the 582 I guess its time to look at it to. Some time ago Steve Winder I believe said that they remove 60 feet of 4130 tubing and ad 80 feet to do the stretch. I would eventually like to widen the landing gear but other than one piece of tubing there are no other changes that need to be done with the material off.
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  8. dholly added a post in a topic The more I dig into my Avid, the less it seems like my paerwork is right   


    Avid used two thickness of spars .065" and .083". However, according to Steve Winder, at one time it appears a few commercial grade 2.5" x .090" spars were shipped. Bob Stone also said Avid ordered .083 and was shipped .090... so they just used them. Long story but it sounds like there are a very few .090" spars out there. I think only the A model had the wood stringers, but many owners cut off the A's fixed engine mount when replacing the Cuyuna so that shouldn't be a surprise. Like many Avids, maybe you have an A model with "a little of this, a little of that". What kind of brakes? On the carry thru tubes, dunno if the tube dia. went up with B and C models, but my Mk-IV #1127D model came without the gussets that later D models had. Might want to add them.

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  9. Trackwelder added a post in a topic The more I dig into my Avid, the less it seems like my paerwork is right   

    No the spars are actually marked 2.50 T6 6061 .090 that really throws me but the doors are the A or B style. One of these days my wife says she will post picture for me I don't seem to figure it out and she is a Special Ed teacher and gave up teaching me.
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  10. dholly added a post in a topic Oshkosh pics and stories   

    A couple pics of Virgin Atlantic's MotherShip White Knight II, aka "Eve", the aircraft designed to deliver the first commercial spaceship to orbit. It is the world's largest all carbon composite aircraft and many of its component parts have been built using composite materials for the very first time. At 140 ft, the wing spar is the longest single carbon composite aviation component ever manufactured. Space Ship II is suspended between Eve's two fuselages as it fly’s to altitude before releasing the rocket pod to ascend into orbit.

    Here's a GigaPan link for some AirVenture 2009 pans to zoom and play around with: http://gigapan.org/searchGigapansList.php?sort=popular&keywords=airventure+2009


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  11. dholly added a post in a topic Oshkosh pics and stories   

    I always take pics of good-looking panels for ideas. This was in a new RV-12, liked the rocker strip and blade fuses. Note the big red "Push to Override Spar Pins" button!

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  12. dholly added a post in a topic Oshkosh pics and stories   

    Snapped this Avid w/ Grove gear taking a turn around the ultralight field one day. Good looking plane, anyone here?




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  13. akflyerbob added a post in a topic My F'd up new full lotus floats   


    This is going to be an endles argument
    We use our planes for different purposes, we like dirt and creek banks
    All I can say is in all my snowmachine days I have never walked home
    and I have a fox mod 1, stock 582, that will make your 912 go hide when
    you fly like we do.

    Bob
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  14. akflyer added a post in a topic My F'd up new full lotus floats   

    No worries.. worst case will be a nice ride into the trees   I can crash pretty damn good when need be.  I can get a new 800 with EFI, computer wiring etc for around 4800.00  No way it will be over 6,000 to have 120 HP in the nose.  I can buy a new sled, then sell the rolling chassis and be into it for less than 2,000 bucks.  Hell that is why they call them experimental.  The 800 is alot less weight and alot more HP than the 912, not to mention alot less cost.


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  15. Av8r3400 added a post in a topic My F'd up new full lotus floats   


    I'd bet Leni'll have more than this or this in that project once it flies.  Ant it would still be extremely experimental and unproven.

    I just don't want to loose our forum owner to some    2-stroke.

    An 80 hp would be even less.  Without even digging I bet I could find a 80 hp 912 for less than $10k.
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  16. akflyer added a post in a topic My F'd up new full lotus floats   


    Hey Crazy, hows it going

    I have put way way way too many miles on sleds to worry about them lasting.  I have total confidence in the AC 600 and 800 engines.  Once we got the fuel mapping issues sorted out up here ( they are set up at the factory to run corn fuel, which makes them 25-30% too rich for up here on good ole straight gasoline), we have not had an issue as long as they are left stock.  You start getting into trouble when you start modding engines withou knowing WTF you are doing.  I have seen a shit load of guys put on a boondocker box, and never take the time to dial it in.  Usually results in a lean burn down when you come off the power on a long down hill run.  If we can run them at 50 below on wide open river runs for 15-20 mile stretches at 8200 RPM, I am not too worried about cruising them at 5600-5800 all day long at -20 (my personal flying cut off point).
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  17. dholly added a post in a topic Avid rebuild   

    Looks nice, good paint job! Heat up one of those hinge pins, then quickly reinsert and remove. Will make a straight pin path even if the bushings are off a bit.
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  18. C5Engineer added a post in a topic Avid rebuild   

    Paint is done! Shocked at how smooth this stuff sprays on. Most of blemishes blended in really well. From 10 feet away a person would never know what a pile of crap it looked like 4 days ago. Got all my hinge pin bushings installed but the pins are really really tight and I'm worried about friction. Anybody have an idea on the best way to ream out the nylon tubing just a tad? Next time I get out to the hangar I'll be putting my tail feathers back on!! After that I just have few odds and ends left then I can taxi her!!



    BEFORE today



    AFTER notice the big ol nasty patch that was on the side in the above pic. It's totally gone now.



    Still blows my mind how smooth the finish is. I am going to recommend that Floetrol to anybody. Gotta be careful not to spray too thick or it will run but it definitely lets the paint sit longer and smoothen out.


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  19. C5Engineer added a post in a topic My F'd up new full lotus floats   


    If ya got $25,000 to blow sure
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  20. Av8r3400 added a post in a topic My F'd up new full lotus floats   

    Then candle that burns twice as bright... 

    I've owned enough snowmobiles to know I would never fly behind one of their motors.  Call me crazy...
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  21. akflyer added a post in a topic My F'd up new full lotus floats   

    too heavy.. gotta think light, and NOTHING will touch a 2 stoke power to weight.  Besides, the 800 will put out ALOT more power than a 912 or a 914...


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  22. akflyer added a post in a topic The more I dig into my Avid, the less it seems like my paerwork is right   

    Can you post a pic of it?  The doors will tell alot.  If I was to rebuild another one, I would go with the merle williams fuse widening kit.  Stupid simple to make the mods and give you a few more inches in the shoulders.

    My HH spars are .083" 6061 T6 so I am not sure where the 090 spars came from.  Is that what is stamped on the spars, or is it possible it was a miss measurement and they really are .083" ?  If you have the time and ability to make the 16" stretch, I would do it.  I am nose heavy with a 582.  You put a subie or VW in the nose and you are going to be adding lead to the tail or moving the battery to the tail.  If you make the stretch, the the taller wider gear will be a must or you will not have crapola for AOA on the wing.  I have the taller gear and even with 24" tires, I want more AOA.  I allways drag the tail wheel in first and could come in slower if I could get the nose up more. 

    A few pics of the plane would make it easier to help you out.

    ps, if yer a welder, then I am the hated one (QC manager)

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  23. Av8r3400 added a post in a topic My F'd up new full lotus floats   

    A 912 sure would be a lot easier...
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  24. Trackwelder added a topic in Avid Flyer General Hangar   

    The more I dig into my Avid, the less it seems like my paerwork is right
      According to the registration on my Avid it is supposed to be an A model but as I look at the fuselage the A model is out, removable engine mount. B model may be possible but I am not sure that the doors are the correct shape. I Believe that the C Model had a wider chassis so I am pretty sure that we stop there as far as thefuselage is concerned.The wings on the other hand are 6061 t6 0.090 on the spars so I don't think that they fit any of the information that I have been able to find. One other thing on the fuselage, there are three wooden stringers glued to the metal work. I guess the big question is should I continue to use the paperwork that I have or is it still possible to register under ELSA and fly off the hours again. I am pretty well tearing this plane down to nothing and rebuilding it from scratch with a few minor changes. Should I change the rudder to recenter it for a future engine replacement VW or Subaru redrive either way or what other changes would you make to your birds if you had them torn down and had the time to do what you wanted. I thought about widening the cockpit but am not having any luck finding out what size the spar carry throught tubes would have to be for the wider chassis. I realize that on the subaru the 16 inch stretch seems to be popular but is it necesary with the VW or just better handling. I love this plane I have dreamed about owning one since I first saw it in Kitplanes. My biggest necessity now is to keep the useable load weight as high as possible figuring the standard 3.8 G that cessenas sem to be rated at. Thanks in advance I am a certified welder so this is the time for me to make the changes that people think are worth while.
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  25. akflyer added a post in a topic Avid rebuild   

    hell looks like you could skip half the list and just fly   I dont have the lexan "inspection" covers at the elevator linkage in the tail, dont have to have them on to fly...  FAA paperwork... blahhh who needs it (ok I will confess, I eventually got mine squared away)

    Get this bugger in the air and forget about that work crap for a week.


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