@@BobKuykendall Awesome I will be there. I look forward to meeting you all. I am the new owner of 577AZ the LS1 swapped RV7. Looking for every opportunity to make that thing stronger and lighter.
Yes, automatic connection for all controls. We still offer the HP-24, but are transitioning to the HP-26 which will only be available with electric sustainer or self-launch systems.
Yes, indeed! The battery quit about three hours into a 4.5 hour flight, but we edited this montage from the footage: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-vNWcQ8EcGKk.html. I just added the link to the description. Thanks for asking!
What was the laminate schedule? It looks like 1 layer of bidirectional CF cloth, a foam (Divinycell?) and another layer of bidirectional CF. What weight cloth and foam type and thickness was used?
@@BobKuykendall That doesn't answer my question. Is it a trade secrete? I'm curious if it's a 5.7oz or 8oz satin, twill or plain weave and what type of foam and thickness was used. The answers would be most helpful with my powered aircraft project.
@@GrantOakes It's not exactly secret, but I'd rather not get into specifics here. For your powered aircraft you'll almost certainly want a more robust lamination schedule based on sound engineering principles. There's a lot of great content on composite design on homebuiltairplanes.com, and many engineers on the forums with a far more comprehensive understanding than mine. I'd recommend starting here: www.homebuiltairplanes.com/forums/forums/composites.8/
Sorry, that's proprietary. I can say that the cross-section is basically an I-beam, and that the spar caps are made of Graphlite pultruded strips. Get a copy of the Marske wing spar guide for details.
@@Bull761 RVs have a lot of potential for performance improvement from a laminar airfoil on a wing with more aspect ratio and a more effective spanwise lift distribution.
@@hpaircraft2187 I built an RV-4, still have it, great versatile aeroplane. For a high altitude special I can understand, for a sport/XC aircraft we already cruise so far above optimum Cl that the benefit would be small I think.
Wow I had no idea rivets was so strong, I was planning to use them to mount a computer monitor to my aluminum window frame but I was scared it wasn't going to be strong enough.
and did you see the "artifacting" alongside the epoxied mount? when in high speed it seems to show the surface actually changing. quite an interesting video. thanks
The top side of this part is actually inside the wing. We do the same process for the upper wing skin, then install the wing spar and control system, then we glue this part on to close the wing.
We pointed the camera at the middle mounting point because what we were expecting was a shear failure of the bond between that Garolite mounting pad and the carbon fiber shear web. That bond turned out to be much more robust than we expected, and the actual failure turned out to be a shear rupture between the two inboard pads. And even that failure came at a substantially higher load than we'd expected according to handbook values for vacuum bagged carbon fiber.
There is no direct contact between any steel or aluminum parts and the carbon fiber. Anywhere they come close there is an insulating layer of fiberglass.
Hi there can you tell me if you have any pics of your rig you made here? How much capacity is the load cell? Where did you buy the readout/loadcell? What are you using to pull? I can't see the top/puller arrangement in any of the videos. Thank you for you help. Watched all of them and enjoyed :)
Rivets are very underrated.I use them pretty much all the time to hold pieces together. You can make anything with the help of L shape metal to connect joints.
Hi, thanks for your test. Would stainless steel pop rivets be stronger than the tested rivets? Anyone else who knows please feel free to answer please, thanks a lot.
What application is the push/pull tube used for? Also, I have another question.... I am a Drafting/Design student and I need to design a step stool. I want to use 3003 1/2" OD aluminum tube for the frame. The frame will be made up of two equal size/shape tubes, each will be bent 4 times to provide mounting areas for steps. The height of the top step will be 16", the bottom step is 8". The two steps themselves will be high density polyethylene plastic, bolted to the tubes. Do you think 3003 alloy 1/2" OD aluminum tube will suffice for my step stool? Any advice will help. Thanks!
If you know anything about mechanics of materials, you would know that the failure makes sense. The cross sectional area around the hole seems to be roughly the same size as the total cross sectional area in the middle. Also, since the hole is there, small failures can be catastrophic to that area. Also, with the sudden drop in strength, that is quite common in almost all materials, but usually not THAT great of a drop. Great video, though! It definitely assures me on the strength of epoxy.
I'm just trying to understand the physics here. Would a lead fall on a clove hitched sling, say if I put a carabiner at the end of the sling, break? I can easily exert 1200lbs when falling. I'm 200lbs x 9.8mp/s (close to 2000lbs). Is that right?
Kind of funny to see these tests performed with high tech machinery, gear made by extremely thorough and professional companies, etc...then the read out is placed on a humble cardboard box. I'm not saying i trust these results any less, just a little odd ;)
never, never, run webbing around bare cable!!! its called hot knifing. And , never put your fingers around a loaded webb or pins like you did! I have personally 'broke' over 200 test pulls like this, testing my stitch patterns and webbing strength. nice job showing stuff.
RobNoone87, thanks for watching! The point of this test was to determine how climbing gear performs under unusual circumstances. Plenty of tests have shown how slings, chocks, and stoppers perform in "real situations;" it alomst invariably performs to its rated specification. The point of my tests were (and still are) to explore the sort of situations, no less real, that climbers occasionally must resort to under desperate circumstances. Thanks, Bob "BoKu" K.
