Vance, One has to wonder if the prop's design twist distribution missed the sweet spot for our airplane/engine combo. I'm thinking it may be too flat, if the smaller engines used in single-place planes turn their props faster, or these birds fly slower. Too little twist would tend to unload sections in the lower radii in cruise, making it easier to overspeed your engine, since their contributions to torque would be less. Just a thought. Slow airplanes, like Quicksilver, require flatter props, while faster airplanes demand twistier props. One fact most people are not aware of is that a given airfoil shape will have a significantly higher AOA at stall (and CLx) on a propeller than on a wing, due to rotational effects. So it may be better to have a little too much blade twist than to have too little, especially in cruise. Flatter props will, of course, climb better.
Here are a couple I pulled up on ebay. 3.5 gallon, and 2.5 gallon. Seems that the 2 1/2 gallon tank has a fuel level sender in it as well. JImChuk https://www.ebay.com/itm/1-GALLON-3-75-LITER-COATED-RACING-FUEL-CELL-GAS-TANK-CAP-STEEL-BRAIDED-LINE-KIT/381623003245?hash=item58da80e86d:g:LVMAAOS https://www.ebay.com/itm/2-5-GALLON-DRIFTING-FUEL-CELL-GAS-TANK-LEVEL-SENDER-COATED-ALUMINUM-RACIN-BLACK/192638626941?_trkparms=aid%3D555018%26algo%3DPL.SIM%26ao%3D1%26asc%3D52885%26meid%3D5342adf33e39458ea2200e9e296cb40d%26pid%3D100005%26rk%3D3%26rkt%3D12%26sd%3D401062400905%26itm%3D192638626941&_trksid=p2047675.c100005.m1851
Thanks! With the sender unit in the header tank I know when the gage needle starts to move, time to land. This is with a 3-4 gph fuel burn. Normally one would not run it that close but when the mains are out, its good to know what you've got left and how much time.
the butt rib is the top stol airfoil cause it has to match the fuselage and false ribs of canopy, so the owner can switch wings with no gap you can see on files here how wings are made , stol,heavy hauler, speed, aerobatic
Just got back from the hanger. I started cleaning and measuring the wings that I have. They measure 125" tip to root rib with the ribs being 12" OC. After scrubbing real hard, I think they might clean up and be usable. I thought the speedwings were 18" OC and the arobatic wings were 12"? What is special about the butt rib and what is its purpose?
hi thx turbo for your input, to extend spars, i had the big luck to find a metric sized tube that goes perfectly in speeding spar, i had to insert them by gently hit. as for wing span, i decided to go on a half extension to keep original short flaps and reduce big adverse yaw given by long wings and gain yaw stability with less inertia for the small avid tail
One of our members is a very experienced tail dragger instructor who checked me out. He lives in the SFO area, but travels as needed, I think. I bet he could also line up a suitable aircraft for a checkout at Palo Alto, his home turf, if you were willing to travel. Marco Caflisch is his name, he has a facebook page
Efil01 did a brilliant job combining the best of both wing types. The problem is nesting the next smaller tubing inside the existing spars since typically this doesn't work with 1/8" diameter steps and wall thickness greater than 0.058". However, by going to the next larger tubing size, for the span extension, and 0.058" wall thickness, you could extend the span out to that of the STOL version. Bending moment at the joint would be well below that at the strut attachment, so it's safe structurally.
I just had a set of the F7a bellcranks made by Mark from the new Avid. He didn't send/make the shafts though. I keep wanting to reach out to him about it. Here is a pic. I would go to the website and send an email to him. Cheers Randy
No, I don't do Ebay. Its a circle track car fuel cell from Summit Racing in Ohio. I investigated having one made but this one was cheaper ($129) than having it made. I did change the fittings from automotive to hose barb type. Weighs 2 lbs empty. It comes with a sealed cap but I also removed that to mount the sender unit which is a vertical float type. The tank is 8"X8"X12". My original header was the 1 1/2 gal poly tank and was aging pretty good. Plus 3 1/2 gal gives me about 45 min reserve when the main tanks go dry. Its made by Rhodes and sold by Summit Racing pt# RHC-18-0103. Neat little tank. Well made for the price. I priced aircraft header tanks from different suppliers and they were expensive.
Just had a huge load taken off my mind about this plane. Every Saturday guys from my EAA chapter meet for lunch and there's a older gentleman that has a reputation as a magician welder and as someone who's seen, done, flown, and worked on just about every kind of plane you can imagine. He said he'd weld the brackets for the new gear on my plane and said he has a tool designed for straightening bent tubing "that makes it a snap". I've been stressing a little about getting that bent fuselage tube fixed and getting the brackets welded on and he made it all sound so simple. I'm a carpenter by trade and any metal work beyond really simple stuff is intimidating to me.
The gear will probably be here in the next month. That gives me a deadline on getting the cowl done and making some modifications to the trailer, both to make loading and unloading easier and prevent or significantly minimize the risk of damaging the plane a second time. I know what's been said about unloading the plane with the wings folded but the pic below shows the main culprit. That's where the tail wheel jumped the track. Haven't decided exactly what I'm going to do yet but definitely something. Probably put a plywood deck on there so even if the tailwheel jumps out it has a place to land.
A couple of quick but interesting reads on topic. 'Who Will Save Democrats From Their Leaders?' -Andrew McCarthy, National Review LINK'How Democrat Rage Is Destroying America' -Daniel Greefield, Frontpage Magazine LINKOne obvious takeaway is way more folks are repulsed by political violence than embrace it, undeniably. The current polls clearly show dem leaders are going down a rathole promoting unpopular leftist policy values. I think Principles are what allow you to live a life consistent with your values. Principles connect your values to your actions through concious decision. Having principles that work is essential to getting what you want out of life. I'm encouraged many DNC members have decided to #WalkAway and not promote violence.
Well minning season is pretty well over here for the yr. down to pay after diggin the 70ft deep hole, but by time i run it this yr it probably end up freezin into the slucie box for winter. So back to work on the Bluefox for a bit, Started recovering the tail peices and one half done in left over Oratex 6000 scrapes from recoverin dads PA12. Hahahhaaaa
Seems good tail wheel instructors are scarce anymore. I got mine 30+ years ago from an old amish guy who rebuilt J-3's. And yes, he wore his hat in the cub. It was a sight to watch those amish women in their bonnets rib lacing a cub wing and they could do one in less than an hour. Takes me an hour to do one rib but that includes coffee time.
Allen - Thanks for the quick response and really good suggestion. I should have mentioned that I did contact Paul Leaderbrand earlier this week, and he is booked out until at least after Thanksgiving. Further mentioned that things become weather dependent that late in the year and we will have to see what the weather brings.
Thanks! Those are great pictures of your door brackets and gives me a new idea to try for mine. I believe the gas struts I have are a little shorter but I think they should still work as long as I get the brackets positioned correctly.