| Wow. It’s certainly not a KR just a price of Info from CASA IN Australia if any flight controls are disconnected, a second qualified pilot MUST do a second inspection before it can be flown. I would have figured the FAA would be the same Phil.
Sent from my iPhone On 15 Aug 2023, at 02:33, Ricardo Moura via KRnet <krnet@list.krnet.org> wrote:
Michael, I do appreciate your brainstorming and eager to find a safe solution.
Before I express my POV, I just want to leave these 2 disclaimers on the table... 1) Although I am an engineer, I am not a mechanical or aerospace one. I am not an expert on the matter. 2) I am not familiar with the plans and instructions for the KR-2 yet. So I cannot refer to them.
Not all bolts are designed to apply clamping force. Some, like the castle nuts, are used to keep things in place. From my perspective, unless the plans specifically define the function of the nut or call for a specific torque to be applied to it, one could argue that this is to keep the connecting rods in place.
Just for reference, the YouTube link below shows the use of a castle nut in a wing folding mechanism (please, forward it to minute 10:15). Yes, the folding mechanism is different and this is an ultralight (with different magnitude of forces applied to the structure). Just food for thought...
Regards,
Ricardo
Greetings
I have done some digging on the KR2 folding wings and while the actual folding mechanism is reasonably easy (See Philip's web link); the quick and safe detach and reattach the WAF bolts has been the challenge. True I can simply spend an age detaching and reattaching the wings and securing the WAF bolt's but to me, that defeats the purpose of folding wings. My use case is to trailer-hangar my KR2 (ZS-VVT) for ease of storage and potentially the flexibility of storing at home.
I am no engineer so there may be a simple solution that I am unable to see.
The 2 scenario's I have researched:
1) If it were possible to simply remove the lower WAF bolts (for example, a secure pin & cotter-pin like the KitFox and others) and rotate upwards that would be great. The challenge I am unable to overcome is the top forward and aft WAF's pivot angles do not align sufficiently to allow for a hinge motion. Tilting the spar's to align them may be an option to align the hinge movement but not feasible for exiting KR2's and I have no idea of what doing so will do to the design, performance and most importantly safety of the KR2. Tilting the spars is a radical deviation from the plans. Personally, tilting the spar is not viable.
2) A potentially more viable solution is replacing the WAF bolts with pins enabling you to rapidly remove all the WAF bolts, pull the wing out a little to clear the WAF brackets and rotate the wings up & backward (like Philip's Folding wing link shows). This would be ideal for trailering & reducing hangar space. The challenge I see is doing so without compromising safety. Replacing the WAF bolts with a hitch-pin and cotter-pin (lynch-pin?) combination for rapid attach & detach is very easy but doing so without compromising integrity and safety of the wing is paramount and where I ran afowl of my lack of expertise.
If anyone has a solution, I would be most interested!
Have a look on my wed page. At the top you will see a folding wing page link. This is not a KR, but this aircraft used the same WAF
Hope this helps Phil Sent from my iPhone I am new to this group and this is my very first message.
I live in the Greater Cleveland area, have always admired the KR-2 design and, until now, it was out of my reach because my goal is to fly an aircraft under the LSA rules. However, it seems like the rules are broadening up, and now I can see a KR-2S in my future.
I saw the post below by David Boyer (KR> Simply Folding Wing) and noticed that the link to the pictures showing his solution is not available anymore.
Can anyone, please, share the pics showing the folding mechanism with me?
Thanks and regards,
Ricardo
KR> Simply Folding Wing David Boyer Tue Jun 21 16:42:55 2011
I have been talking with badbob0007 (Bob Johnson) and we both would like the ability to fold our wings up and directly over the top of the canopy for transport. This is a basic idea on a double pivot design so the wing can have enough clearance to fold.
I hope this will be useful. Thanks David Boyer
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