Stuart Marsden Posted October 10, 2017 Share Posted October 10, 2017 I have just completed a Hobby King Vampire mk6. Using all the recommended, I have flown twice, 4 cells 2200 40c Turnigy, 5 minutes mixed flying, 3.8 left in each cell. Two smooth landings (greased even).I picked up the model and one of the main u undercarriage legs fell to the floor. On investigation there are no retaining grub screws to hold the lugs in place, only empty threaded M3 holes on each side. So lucky not to have any damage, but the other leg appears to be solid fixed even without the screws. Has anyone else had this? Screwing M3 bolts into the threaded holes is smooth and it is definitely the correct thread, but they won,t screw in to pinch the leg on either side. It looks like the missing screws must have a forward point. Are these available, comments please. Cheers Stuart Quote Link to comment Share on other sites More sharing options...
John Tee Posted October 10, 2017 Share Posted October 10, 2017 Stuart, asking the obvious but are there flats on the legs for the screws to locate on. May not get them tight enough without. John Quote Link to comment Share on other sites More sharing options...
Stuart Marsden Posted October 10, 2017 Author Share Posted October 10, 2017 Many thanks for your reply, I have now solved the problem. There are flats on each side of the legs. The grub screws are so small in depth, only 3mm, they where there all the time with the smallest Allen key to tighten I had screwed in M3 bolts what I thought was to the leg, where infact the grub screws where still there but so loose. A good light and further investigation solved the problem. Cheers Stuart Quote Link to comment Share on other sites More sharing options...
Trevor Crook Posted October 11, 2017 Share Posted October 11, 2017 I have had several Durafly models over the years, and it is certainly worth checking those screws every now and then as they do work loose. Not had any come loose after just a couple of flights though - must have been a factory error. I've been reluctant to use threadlock as it may make things a bit "permanent". Quote Link to comment Share on other sites More sharing options...
Piers Bowlan Posted October 11, 2017 Share Posted October 11, 2017 The blue threadlock is not permanent but the green is. However grub screws can corrode (think flying boats!) and be very difficult to remove if corroded, from my experience. Quote Link to comment Share on other sites More sharing options...
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