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I'll take a look for any head markings on the NR bolts.  I did replace them with AN5-36 bolts, so shouldn't have any issue with bolts going forward.  I'll have to change the clamp bolts out as well.  JImChuk

So what markings are on the heads of those socket head bolts? From what I've read online they are supposed to be made to a better tensile standard then grade 8.

They are supposed to be on par with ISO metric standard of 12.9 or better which makes them a cut above grade 8. 

Well id say never use thier bolts, and ill bet they stopped selling bolts cause of the streching problem, they must b grade 5 or lower bolts, id pitch them in a round receptical and go buy some grade 8 hahahahaaaaa

Hi all,  I have about 175 hrs on my NR two blade prop on my Kitfox 4 with 80 HP 912.  I've adjusted the prop a number of times between winter and summer, but never actually took the bolts out.  The other day I put a balance master on it, and got new AN5 bolts for the install.  Here is what I found.  I've always torqued the bolts to correct torque, but a few times it did seem like a couple of them acted weird.  Like not turning as much as I expected at the next torque setting.  I would say that apparently, they weren't tightening up to correct torque, at least some of them.  I'm back to working on my new built Kitfox 4 now, and I took the NR two blade prop off of it, so I could work on the engine and cowl install better.  I had ran this engine/prop about 15 or 20 minutes last summer, before I got side tracked.  Both times I used the bolts that NR supplied with the props.  Last prop I know of that came from them didn't come with bolts.  Maybe I'm not the only one who had an issue.  I like the prop, gives good performance, but if you are running their bolts, you may want to have a look.  First and third pictures are the 80 HP, the number two and four are from the 100 HP 912 with 15 or 20 minutes run time.  JImChuk

Do you still have a kitfox 4 rib?

Jim, 

Very late on this but next time you go, stop over at the Tripple Tree Airfield. https://tta.aero/ Very cool place to visit! Bryce 

Recently I saw someone had made dolly wheels with two wheels and it looked like a good idea to me.  My single wheel ones sagged to one side and weren't the best.  Made a set of the duel wheel ones and finished them today.  Much better.  Pull the one 1/4" bolt and they come off.  They are a bit wider than needed for these skis, but I may make another set of skis, and they will be a bit wider.  JImChuk   

PS  not sure how this ended up in the close calls and dumb stunts the first time.  Moved it now and will try to delete the other post.  

Thanks Jim!

Posted in wrong place

I've flown on wheels with 4 or 5" of snow.  Heavy wet snow would be worse than light fluffy stuff of course.  Skinny tires will cut through the snow better than wide ones.  Try for three point full stall landings as well.  Don't wheel land it.

My Northern Friends,

How deep does snow have to be before putting on the snow skis? Diva has the big Aero Classics on her, but I don’t want to find out the hard way

Jim. I don't think my plane has any of the upgrades you mentioned. I'll try to get a look at it in the next couple days. I know it doesn't have the rudder pedal mods for instance.

I built those skis myself.  I have a sketch somewhere that I was making and never completely finished.  Some one else was asking about it the other day, and I couldn't find it.  Here is a post I started a few years ago.  JImChuk

Making a new set of skis - Forum How-to's - AvidFoxFlyers Forums

Jim, I'm jealous. Not that I have a lot of use for skis, but I am curious if those are production pieces or did you make them? If you made them are they plans you could share or are they in your brain?

The heavy hauler wing has two ribs between the ribs with the long tailed ribs that the flaperon hinges on.  The STOL wing has only one rib between the long tailed ribs.  

Unfortunately, this kit came with 3/4" lift struts which I understand lowered the gross weight. If I could find some 7/8" struts (or get better at tig welding), I would substitute them. The ribs are spaced closer than the stol wing. 

Thanks for the replies guys. A friend has a three blade hub (Duc) coming and I can give his a try so I guess I’ll see how that goes. He tried the four blade and didn’t care for that so he’ll have an extra blade anyway.

Well if your kit is mostly complete, if you have .083 spars then you should have lift struts that are 7/8 inch in diameter, and this is what is on my heavy hauler plane. The heavy hauler wing and aerobatic speed had more ribs in them then the "lighter" models.

My NR has treated me well, no complaints.  The performance is not as good at my 78x48 Prince down low, but better top end.

I've spoken with a couple guys at OSH who love their DUC propellers.  One guy had a constant speed version and had nothing but praise for it's performance.

The Bing floats shouldn't weigh over 7 grams for the pair.  If they are to heavy, your fuel level will rise in the float bowl.  

I was helping a friend of mine order an NR prop, and I had a hard time getting a response from him, so ended up ordering it from Meglin Propellers and fans for everyone - Home (mozello.com)  He has it on a Kitfox 4 with 912 ULS.   They are the same props as NR sells.  He just got a few flights with it, and now is snowed in so he hasn't really had a chance to test it much.  I'm running a 2 blade NR on my Kitfox 4 with 80 HP 912, and I like it.  Have one on the new Kitfox 4 build as well, but it's not flying yet.  JImChuk

My kit originally was an aerobatic speedwing with .083" spar tubes. I am (very slowly) building new wings with .063 tubes and Just Aircraft spar stiffener inserts. I believe they are the same inserts as Kitfox currently uses. The new wings should be plenty strong for a higher gross but my guess is the plane would then be limited by the fuselage construction and struts. would be nice to know the structural differences with the MkIV. Specifically tube diameters and wall thickness in critical areas. I've seen the extra gussets in a few places but can't imagine they are the only changes.

Thanks guys.  Gonna do the run up then cut off and check the bowl level test. Never done that one before. Bryce 

My Avid MKIV serial #1250 was delivered in November of 1992. 11/23/92 to be exact.

Anybody flying behind a Duc prop?  I have the means to purchase one for myself at wholesale but haven’t pulled the trigger, seems like all of the quality props claim super performance but all end up about the same.

Flying behind a Warp Drive with no complaints at present.  Price wise NR seems hard to beat just a bit of a hassle with ordering. 2 vs 3 blade thoughts?