N447MR
Junior Member
- Joined
- Aug 24, 2017
- Messages
- 85
- Location
- Chicagoland
- Aircraft
- Air Command Tandem w/ a broken seized up no good 2.2 subaru & 28' Dragonwings
UPDATE below.
CLT Tandem Air Command, Subaru 2.2, Warp drive prop, 28or 29' dragon wings, electric prerotator. I've got over 100 hours on this machine. Sure does fly nice as best I can tell. More stick shake than I'd like since flying my friends MTO, but perhaps its as good as it gets.
Problem is, if there's any kind of wind that gets under the rotor before or as I'm spinning them up, they can be at such an angle that the hub will hit the torque tube on the mast. Until I'm up over 50 rpm or so it can do this and it hits it enough to be really un-fun and it can stop the blades. It will even be on an extreme enough angle that it can scrape the ground if I'm taxiing out and don't have the rope on it. It doesn't matter if I have the stick forward or not because it is teetering so that it doesn't matter the angle of the whole head. I've attached pictures that I took in the hangar where you can see there where it can hit the tube. (though it would hit the other side when spinning, it was just to take a pic). some have suggested I need a rubber stop of some kind under the teeter block to act as a stop, but I don't know what that does when I need the stick forward, I don't know how the "teetering" looks when spinning at flight speeds.
As it is now, I taxie down close to the end of the runway and pull the blades down with the tie rope so I can get hold of them. Then I give them a good heave-ho and try to engage the prerotator ASAP so they spin up before any wind can cause them to teeter too much. This has happened only a few times, but I don't like it and when I go out to have fun on a windy day it concerns me cause it can hit hard, then I have to go back and make sure nothing is messed up(and it hasn't been yet other than a couple small gouges out of the hub corner).
Tried to be clear, but please let me know if I can be more clear. Just want to find out if this is either something to live with, fix, or could be dangerous beyond what I've already explained.
Thank you very much for the help.
Geoff
Okay- So I finally got back to the airport yesterday and to my surprise, the teeter block was NOT in the top hole. This really surprised me because I thought that it had been there all along and so hadn't considered it further. Always humbling. None of the guys at the hangar thought of it in all this time either. I'm very grateful to have the additional online forum help, thank you.
With the block now in the top hole, the teeter is as it should be.
CLT Tandem Air Command, Subaru 2.2, Warp drive prop, 28or 29' dragon wings, electric prerotator. I've got over 100 hours on this machine. Sure does fly nice as best I can tell. More stick shake than I'd like since flying my friends MTO, but perhaps its as good as it gets.
Problem is, if there's any kind of wind that gets under the rotor before or as I'm spinning them up, they can be at such an angle that the hub will hit the torque tube on the mast. Until I'm up over 50 rpm or so it can do this and it hits it enough to be really un-fun and it can stop the blades. It will even be on an extreme enough angle that it can scrape the ground if I'm taxiing out and don't have the rope on it. It doesn't matter if I have the stick forward or not because it is teetering so that it doesn't matter the angle of the whole head. I've attached pictures that I took in the hangar where you can see there where it can hit the tube. (though it would hit the other side when spinning, it was just to take a pic). some have suggested I need a rubber stop of some kind under the teeter block to act as a stop, but I don't know what that does when I need the stick forward, I don't know how the "teetering" looks when spinning at flight speeds.
As it is now, I taxie down close to the end of the runway and pull the blades down with the tie rope so I can get hold of them. Then I give them a good heave-ho and try to engage the prerotator ASAP so they spin up before any wind can cause them to teeter too much. This has happened only a few times, but I don't like it and when I go out to have fun on a windy day it concerns me cause it can hit hard, then I have to go back and make sure nothing is messed up(and it hasn't been yet other than a couple small gouges out of the hub corner).
Tried to be clear, but please let me know if I can be more clear. Just want to find out if this is either something to live with, fix, or could be dangerous beyond what I've already explained.
Thank you very much for the help.
Geoff
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