Is this a bad idea?
10-13-2007 | 02:39 PM
#1
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From: littlet, CO
Is this a bad idea?
Well, my plane extra 300 likes to come in a bit hot for landings, otherwise it just drops out of the sky. Would it be bad to add a little down ailerons to solve this issue? I don't have mixing capabilities so this "down ailerons" would be persistent throughout the entire flight.
Opinions please.
Opinions please.
10-13-2007 | 06:14 PM
#3
RE: Is this a bad idea?
You did not mention which Extra 300 you have. Since this is the beginners forum I would guess you probably have the Park Flyers Extra 300 that advertizes, "Hover at 1/2 throttle"??? If it is I hope you have some experience prior to that plane. What will likely happen if you set your ailerons up the way you describe will be an adverse downward pitch of the nose. I know that does not make sence however, all but one of my models will do this when I apply Flapperons without mixxing it with up elevator. Since you do not have the ability to mix I would encourage you to learn to land it hot as opossed to adjusting the ailerons and elevator. Now I have no idea of your previous experience so forgive me if I presume to much.
Best of luck with whatever you decide.
Best of luck with whatever you decide.
10-13-2007 | 09:23 PM
#6
RE: Is this a bad idea?
ORIGINAL: MinnFlyer
Re-check your CG. The problem you describe sounds like a classic case of either the plane is too heavy, or it's too nose heavy.
Re-check your CG. The problem you describe sounds like a classic case of either the plane is too heavy, or it's too nose heavy.
10-14-2007 | 12:46 AM
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From: Houston, TX
RE: Is this a bad idea?
Often "hot airplanes" will slow down in experienced hands.
Describe your landing technique. I would hope you say that you slow the plane using the elevator and that you control the sink rate with throttle. Remember . when you slow down using the elevator, you increase the angle of attack, this causes greater lift, but greater drag, therefore you must now add power to overcome the additional drag.
Chopping power and gliding in is not an effective way of slowing an airplane.
Describe your landing technique. I would hope you say that you slow the plane using the elevator and that you control the sink rate with throttle. Remember . when you slow down using the elevator, you increase the angle of attack, this causes greater lift, but greater drag, therefore you must now add power to overcome the additional drag.
Chopping power and gliding in is not an effective way of slowing an airplane.
10-14-2007 | 01:21 AM
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From: Tracy,
CA
RE: Is this a bad idea?
Setting a SLIGHT amount of down trim (flaps) to both ailerons might not be a bad idea, especially if they are slightly up (spoilers) right now. But adjust the linkage so they are no more than 1/8" below the T.E. of the wing, probably 1/16" would be better. Loose linkage or sloppy hinges could be allowing the ailerons to fly in a slightly upward condition under normal flight.
10-14-2007 | 10:09 AM
#10
RE: Is this a bad idea?
bad idea ,it would be like having wash in built into the wing and when the tip does stall low and slow to the ground the resulting tip stall and snap will be almost impossible to recover from.
10-14-2007 | 10:14 AM
#11
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RE: Is this a bad idea?
You want the angle of attack of the wing less at the tips than at the root. This is done so the root of the wing stalls before the tip. Therefore you have a plane that stalls straight down without dropping a wing.
To droop the ailerons has the same effect as twisting the leading edge of the wing up at the tips. With the greater angle of attack at the tips, one wing tip will stall first, every time, causing the plane to snap roll into the ground at landing.
To droop the ailerons has the same effect as twisting the leading edge of the wing up at the tips. With the greater angle of attack at the tips, one wing tip will stall first, every time, causing the plane to snap roll into the ground at landing.
10-14-2007 | 12:12 PM
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From: Kershaw, SC
RE: Is this a bad idea?
ORIGINAL: Mr67Stang
You did not mention which Extra 300 you have. Since this is the beginners forum I would guess you probably have the Park Flyers Extra 300 that advertizes, "Hover at 1/2 throttle"??? If it is I hope you have some experience prior to that plane. What will likely happen if you set your ailerons up the way you describe will be an adverse downward pitch of the nose. I know that does not make sence however, all but one of my models will do this when I apply Flapperons without mixxing it with up elevator. Since you do not have the ability to mix I would encourage you to learn to land it hot as opossed to adjusting the ailerons and elevator. Now I have no idea of your previous experience so forgive me if I presume to much.
Best of luck with whatever you decide.
You did not mention which Extra 300 you have. Since this is the beginners forum I would guess you probably have the Park Flyers Extra 300 that advertizes, "Hover at 1/2 throttle"??? If it is I hope you have some experience prior to that plane. What will likely happen if you set your ailerons up the way you describe will be an adverse downward pitch of the nose. I know that does not make sence however, all but one of my models will do this when I apply Flapperons without mixxing it with up elevator. Since you do not have the ability to mix I would encourage you to learn to land it hot as opossed to adjusting the ailerons and elevator. Now I have no idea of your previous experience so forgive me if I presume to much.
Best of luck with whatever you decide.
If you could move your CG back just a little at a time, I would be willing to bet that the plane would fly much slower. Being that this post is in the beginners forum, I would suggest staying within the recommended limits until you are comfortable with the change. I like flapperons, but I really only need them on a plane outfitted with a 2 stroke engine, and I never use them for landing. Flapperons take away the effectiveness of the ailerons.
10-14-2007 | 12:45 PM
#13
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RE: Is this a bad idea?
If you get the CG too far back, the plane will become squirrelly at landing. So as you are adding tail weight, when the elevator starts becoming difficult for you when you are trying to land, you have gone just a little too far with moving your center of gravity back.
10-14-2007 | 02:17 PM
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From: Kershaw, SC
RE: Is this a bad idea?
Assuming you are using a nitro engine, you might try a wood prop before adding any weight to the rear of the plane. The wood props are quite a bit lighter than nylon composite or plastic. And it is true ... if you get the CG too far back, the elevator will have too much authority. I can dial it down with my dual rates, but it still takes a bit of finnesse and a whole lot of practice. You should be ok though if you start off staying within the Mfgr CG range. I didn't mean to sound like you should go straight for the throat and move the CG 2 or 3 inches back from where it is suggested. As a matter of fact, none of my planes have gone past 1/4 inch from the range the manual suggests. I just like landing tailwheel first.
