Hmmm good suggestion! I’ll let you know how it goes.
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Ridge Runt Evo - Build Thread Comments
- Thread starter mjgillen
- Start date
That seems to work just fine. I put three pieces of blue painter's tape in between the upper tail mount and the stab and the trim is a lot closer. I will add more if this is not good enough however it's a better solution than trying to re-bend the wire.
Thanks again!
Michael
PS: Photo at Torrey Pines (I was alone so no one to photograph me launching it for the first time) Sorry for the rubber bands my hatch magnet came loose. I have fixed it...
Thanks again!
Michael
PS: Photo at Torrey Pines (I was alone so no one to photograph me launching it for the first time) Sorry for the rubber bands my hatch magnet came loose. I have fixed it...
Michael
You didn't say which way you had to trim (up or down) to trim it out. My guess is you had to trim
elevator down. Once you get it trimmed out by using shims on the stab. you can then either sand
down the platform to the correct angle, or make a tapered wedge and glue it in place. Keep an eye
on the CG also as you are making these small changes! Make all of the initial shim locations at the
attachment bolt locations so as to not bend or distort the Stab.
Tom
You didn't say which way you had to trim (up or down) to trim it out. My guess is you had to trim
elevator down. Once you get it trimmed out by using shims on the stab. you can then either sand
down the platform to the correct angle, or make a tapered wedge and glue it in place. Keep an eye
on the CG also as you are making these small changes! Make all of the initial shim locations at the
attachment bolt locations so as to not bend or distort the Stab.
Tom
Hey Wayne,
I am afraid I do not understand what you just said! When you move any control surface you induce drag. To pitch the aircraft slightly nose down and
make it easier to fly, you trim the elevator down. If you need more elevator down but you run out of trim, this tells you that you need more elevator
down. You don't want to fly with the aircraft in that condition! This situation tells you that you can return the elevator back to center and shim
or increase the Angle of Attack (AOA) of the entire stab. a small amount with a shim or reduce the angle of the wing by placing a shim under the trailing edge..
Since both the wing and stab. are removeable on the RUNT you are free to try either method.
By Adjusting the (AOA) of the wing you reduce the lift force and it's induced drag, without inducing the drag that would be caused by the fuselage, if you pitch the nose down with a stab. pitch change.
I do not know what the CG is on Michaels model but if it is very flyable it must be ok.
I am not sure I know just how the length of the push rod fits in here.
Tom
I am afraid I do not understand what you just said! When you move any control surface you induce drag. To pitch the aircraft slightly nose down and
make it easier to fly, you trim the elevator down. If you need more elevator down but you run out of trim, this tells you that you need more elevator
down. You don't want to fly with the aircraft in that condition! This situation tells you that you can return the elevator back to center and shim
or increase the Angle of Attack (AOA) of the entire stab. a small amount with a shim or reduce the angle of the wing by placing a shim under the trailing edge..
Since both the wing and stab. are removeable on the RUNT you are free to try either method.
By Adjusting the (AOA) of the wing you reduce the lift force and it's induced drag, without inducing the drag that would be caused by the fuselage, if you pitch the nose down with a stab. pitch change.
I do not know what the CG is on Michaels model but if it is very flyable it must be ok.
I am not sure I know just how the length of the push rod fits in here.
Tom
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I read that he messed up on the length of the pushrod and could not get the elevator to center. Thus my comment against the shim.
The Ridge Runt should build out with zero degrees of incidence. That is the purpose of the plastic bits in the bottom of the vertical, it is there to lock in the correct angles.
The Ridge Runt should build out with zero degrees of incidence. That is the purpose of the plastic bits in the bottom of the vertical, it is there to lock in the correct angles.
Wayne,
I hear you but I guess you are telling me that he made the pushrod too long and could not get the elevator DOWN to center.
By elevating the entire stab. with a constant thickness shim he gets the elevator in effect DOWN. Taking the shim out just puts
him back where he started. I incorrectly, I guess , thought he had run out of travel with the down elevator.
Tom
I hear you but I guess you are telling me that he made the pushrod too long and could not get the elevator DOWN to center.
By elevating the entire stab. with a constant thickness shim he gets the elevator in effect DOWN. Taking the shim out just puts
him back where he started. I incorrectly, I guess , thought he had run out of travel with the down elevator.
Tom
Here's how I ended up filling the wing saddle gaps. I used some strips of 1/16 balsa to widen the rails of the saddle a bit, then made a paste of wood glue and micro balloons as a filler. I put some packing tape on the wing bottom to protect it, then sat the wing in the saddle so that the paste would mold to it. I did this in three or four steps. I think it came out pretty good.
