Flaps and engine on Stuka
01-11-2005 | 10:57 AM
#1
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From: Madrid, SPAIN
Flaps and engine on Stuka
I'm building the GP Stuka but it's my first plane with flaps. Should I use them with a switch or on a knob? (I have a Futaba FF9)
I heard I probably won't have to use the flaps because the plane looses speed quite fast?
I have at home an OS61FX and an OS91FX and would like to know which to use on the Stuka. According to GP instructions, I should mount the OS61 but I think the extra power of the 91 is always useful.
I heard I probably won't have to use the flaps because the plane looses speed quite fast?
I have at home an OS61FX and an OS91FX and would like to know which to use on the Stuka. According to GP instructions, I should mount the OS61 but I think the extra power of the 91 is always useful.
01-11-2005 | 03:46 PM
#2
My Feedback: (9)
RE: Flaps and engine on Stuka
Ilasa, I have included a link to a thread I started for mine.
http://www.rcuniverse.com/forum/m_10...tm.htm#1073990
As far as engine I had a Super Tigre S-90 lying around so I used it. It was clearly more power than the plane needed. Most of my flights were at 2/3 to ¾ throttle because adding the extra throttle gave the plane very little if any extra speed but burned a lot more fuel.
As for landing with flaps reduce the throttle to a rpm that you would use to land the plane without flaps and let the plane slow. When around 50mph put the flaps down full (45 degrees) if the plane noses up wait for it to slow a little more the next time. If it noses up that means it is two fast, wait for the speed to come down and the nose will come down with the speed. If the nose does not com down on its own the throttle is two high.
Once the plane gets to a comfortable flap speed you will have to hold elevator just like on a clean landing and the plane will tool around the sky very happily in that configuration. It is important to fly it around with the flaps down because the attitude of the plane in flight has changed and you need to get used to the new attitude. Once you think you are ready to land do not reduce the throttle. Fly the plane to the ground, when it is at a foot off the runway and level and faster than #$%^$ bring the throttle to idle and keep the plane level (remember the flight attitude with flaps has changed to slightly nose down). If you pull to a clean level you are actually flared and the plane will slow extremely fast and that is OK if the wheels hit the ground before it stalls. But for a perfect flap landing once the throttle is reduced to idle you want to wheel land tail high. It goes against everything you have been tought to this point and that is what makes doing this so difficult.
For the first few landings add about three to five clicks of throttle to the idle to reduce the deceleration speed when you go to idle. Chances are you will not land on the first few passes because it will seam so fast to you, but as you get used to the sink rate and the rate it looses speed you will start to anticipate when to reduce throttle. If you feel you are loosing speed to fast you can advance the throttle to reduce the speed lose but working the throttle at first with everything else you need to learn is to much. I would restrict your throttle to bailing out until you have a few landings under your belt. To bail out advance the throttle to ¾ keep the same attitude and the wings level the plane will climb on its own as long as you keep a level attitude. Bank gently because with all the lift from the flaps it wont take a lot to turn. When the turn is complete reduce the throttle for another landing attempt.
Good luck
Joe
http://www.rcuniverse.com/forum/m_10...tm.htm#1073990
As far as engine I had a Super Tigre S-90 lying around so I used it. It was clearly more power than the plane needed. Most of my flights were at 2/3 to ¾ throttle because adding the extra throttle gave the plane very little if any extra speed but burned a lot more fuel.
As for landing with flaps reduce the throttle to a rpm that you would use to land the plane without flaps and let the plane slow. When around 50mph put the flaps down full (45 degrees) if the plane noses up wait for it to slow a little more the next time. If it noses up that means it is two fast, wait for the speed to come down and the nose will come down with the speed. If the nose does not com down on its own the throttle is two high.
Once the plane gets to a comfortable flap speed you will have to hold elevator just like on a clean landing and the plane will tool around the sky very happily in that configuration. It is important to fly it around with the flaps down because the attitude of the plane in flight has changed and you need to get used to the new attitude. Once you think you are ready to land do not reduce the throttle. Fly the plane to the ground, when it is at a foot off the runway and level and faster than #$%^$ bring the throttle to idle and keep the plane level (remember the flight attitude with flaps has changed to slightly nose down). If you pull to a clean level you are actually flared and the plane will slow extremely fast and that is OK if the wheels hit the ground before it stalls. But for a perfect flap landing once the throttle is reduced to idle you want to wheel land tail high. It goes against everything you have been tought to this point and that is what makes doing this so difficult.
For the first few landings add about three to five clicks of throttle to the idle to reduce the deceleration speed when you go to idle. Chances are you will not land on the first few passes because it will seam so fast to you, but as you get used to the sink rate and the rate it looses speed you will start to anticipate when to reduce throttle. If you feel you are loosing speed to fast you can advance the throttle to reduce the speed lose but working the throttle at first with everything else you need to learn is to much. I would restrict your throttle to bailing out until you have a few landings under your belt. To bail out advance the throttle to ¾ keep the same attitude and the wings level the plane will climb on its own as long as you keep a level attitude. Bank gently because with all the lift from the flaps it wont take a lot to turn. When the turn is complete reduce the throttle for another landing attempt.
Good luck
Joe
