is there a rule of thumb on linear placement and spacing when using 1010 rail buttons? I am scratch building and my air frame tube is 3" in diameter and 30" long. Where would you place them? My first experence using a launch rail.
Steve
Steve
There's a plethora of discussion and links in the following thread:is there a rule of thumb on linear placement and spacing when using 1010 rail buttons? I am scratch building and my air frame tube is 3" in diameter and 30" long. Where would you place them? My first experence using a launch rail.
Steve
The simple fact is that rail button placement isn’t very sensitive. As long as one is near the bottom and the other is far enough above it to keep the rocket from turning before it gets to the end of the rail you’ll be fine.
The forward button up around the CoG, but up towards the forward end of the booster tube. In your case, perhaps 10" from the top of the tube
I agree. All the CP/CG concepts sound cool and all, but I think it simply boils down to the speed and wind once the first button leaves the rail.I've been back and forth on the question of button or guide placement a few times. The analyses around cg and cp make sense to me, but I've been convinced by other flyers that such concerns apply mainly to rockets with insufficient exit speeds. Ideally we should be going fast enough off the rail that the time between buttons being freed from the rail doesn't permit significant deviation from the guided direction.
Good point. However, if the rail exit velocity is significantly greater than any crosswind component, regardless of button position, I’d still be opting for a separation to limit binding.Be aware that once the forward button clears the rail, the button/rail system is no longer effective.
Therefore, the distance from the forward button to the top of the rail is the correct rail length to use for an accurate rail exit velocity in simulations.
That may influence your placement decision.
(edit: which John said more succinctly above…)
after reading all the comments, I'm as confused as ever.
Someday I need to look into what tools they use to do the rigging in those.Ships, bottles.
Whenever a technical debate drags on for any length of time without a resolution, it means the real answer is it doesn't really matter. This discussion is an example.after reading all the comments, I'm as confused as ever.
where to put rail buttons
best answer yetOn the rocket.
There you go, killing my dreams of entirely new classes of micro-hemostat-like devices for intricate work my eyes aren't good enough for anyway.The ship is built outside the bottle and the mast and rigging are lifted into place after it is inserted as they are built to pivot.
I was almost tempted to change the location of the buttons on my L2 project, but then I came to my senses.I'll be thinking of this thread every time I start to mark the locations of guides.
John, 1/2 way to the CG from where? Aft end of rocket? Rear button? Tip of nose? Front of airframe?Scott Bartell told me long ago: "one at the aft end, the other halfway to the CG."
Yes, the aft end of the rocket. (It stops being effective once it leaves the rail.)John, 1/2 way to the CG from where? Aft end of rocket? Rear button? Tip of nose? Front of airframe?
Thanks!
In your range box, in case someone needs a rail button.On the rocket.
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