Dynamic Models [Hi Johnson] used to sell circular bellcranks. I never used them but i do have a few NIP.
dennis
Dennis;Probably came with a Big Block Fox .78 on e-bay..... LL~ D>K
Does this mean that one might be availlable? If so how big are they, I have a large one from "Golden State Models" in Kingsburg, Ca. I don't believe they are in business anymore. I tried to "google" them today -- nothing? I don't even remember how I got this one, I think it was in a package deal? "Billy G"
More accurate to say that Ted has used them. I think he came up with pretty much the same conclusion I did. They work fine but are a lot of extra work and you don't get a significant benefit.
Dennis;
Does this mean that one might be availlable? If so how big are they, I have a large one from "Golden State Models" in Kingsburg, Ca. I don't believe they are in business anymore. I tried to "google" them today -- nothing? I don't even remember how I got this one, I think it was in a package deal?
"Billy G"
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Bill,
Found them and your probably not interested in them. I have 4 of them, all of them are 2 inch for Rat/team race. They do however have all the hardware even a hex wrench . Don't know if I'd like a pulley type control system, perhaps I'll try one on something, sometime,someday. If you want one let me know, ok.
Dennis
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I couldn't believe how ovaled out both the elevator and flap horns appeared. Amazing that model could fly at all....except I think it was Joe Dill who told me that some pretty successful stunt flyers...actually BUILD IN EXTRA SLOPPINESS into the elevator horn with an over sized dia. hole drilled so that the pushrod allows for extra....elevator slop.
(The weird idea that the elevator in flight will actually seek its netural setting)....so that if their was bellcrank..pushrod alignment was off a tad....this would actually prevent the "hunting" in level flight that some flapped stunters AND especially stunters with short distances from the flap hinge line to the elevator hinge line moment arms.
IS THIS AN OLD STUNT-GRUNT HUSBANDS TALE OR WHUT? LL~
eZ@@ZZZ
Dunno who else uses it, but it's an old Rat Racer trick from the 60s. If your model had a hunting problem and balanced OK, the next step was to wallow out the hole in the elevator horn. It always worked. Only problem was, it would wear bigger quickly, to the point of wearing completely through, so you had to keep an eye on it. I always figured it was from the elevator vibrating in flight or something. Put on a new horn without wallowing out the hole and your hunting problem would reappear. Weird. I wish someone would explain the aerodynamics of that.
--Ray
Greg,
No, no bad experience. As I say, they work fine. They give a bit smoother feel at the handle and you avoid the negative exponential progression that comes with a regular bellcrank, I suppose. I just didn't see any practical advantage to using one. If I had both, it might be worth using one for whatever advantage, real or preceived. But I just thought they were a lot of extra work for little real benefit.
Ray;
You are a "Glutton for Punishment". Didn't you get enough on the "Missing Formula" thread. LL~ LL~ Explain the aerodynamics ot that indeed.
"G-Man" S?P S?P S?P
Steve and Ray;
I just know I'm puttin my foot in it again, but would you PLEASE explain push pull method for me? Ignorance is not just your trait to flaunt Ray, I have a little myself, and for some reason never fail to let it hang right out there.
"Billy G" S?P S?P S?P
There is no end to my masochism...I never miss a chance to flaunt my ignorance. I notice no-one's tackling the explanation.
Dennis, the "hunting" Rats were the exception, not the rule; they generally grooved well--just glorified, overpowered trainers, after all. But for the occasional stubborn hunting problem, wallowing out the horn was a quick, sure fix. Nothing worse than a Rat that won't sit where you put it, especially in a crowded circle. Ever fly five up in contest conditions?
--Ray
No 4 was my limit. it is crowded enough with that many up. Flying a fast rat was work but it was supposed to be fun too. Too many planes was to me an accident waiting to happen