My new F15 complete build log (Steve's plan)

Started by foamybuilder, July 23, 2011, 03:44:57 PM

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PankajC

Spektrum DX6i | EP Pusher Trainer | EP CUB |

foamybuilder

Thats great build sumeet.  {:)}
My plane has crashed and nose and half fuse part has come out. cf dint do the job somehow, due to the paint the glue had become loose.
Was a bit tail heavy, but it glided fine during glide test. Adarsh did the takeoff and i tookover after some circuits. It was very underpowered was at full throttle all the time. During landing it stalled out of control and crashed. This is my first painted plane and first unrepairable crash i can say. During the glide test, some part of elevator got damaged. The colored packaging tape which we use could have sustained this crash.
My suggestion to sumeet. Elevator is the first part which will get damaged, if you are not too much concerned about the look, do your decoration with packaging tape. It was tempting for me to use paint to make it good looking and dint worry much about its strength  :-\


ritz

great effort sumit bro reallllly great effort 
thodi si hume bhi training de do

roopeshkrishna

Phoenix.........

Sumeet

Thanks a Lot guys.

@ Foamybuilder
Really sorry about the crash...   :(

I will use the color packing tape. Full white on the upper fuselage and Something dark in the Bottom. I am nervous about its maiden. Last day I decided to go with a Turnigy Bell Motor "1600KV". With a 8" Propeller and 1300~1600mAh 3S Battery, It is expected to give about 750~800gms static thrust. The AUW is going to be around 600~650gms. So, Thrust to Weight ratio will be greater than 1:1, So It will go vertical as expected.

All the seniors here, Please share your experiences about Pusher jets.

Thanks.
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rcpilotacro

Decals can wait, getting thrust and the thrust line right is the key, 1:1.2 to 1:1.5 should be the min T/W ratio for such  a build. Even if u stall, power can recover you out of ground. With suffienct power she can do a good cobra & high alpha touchdown, provided you have the power. Skewed thrust line can spoil the model.
Caution about glide check. A powered airplane should go nose down, power off. It should glide at its design glide speed which is also called as Vimd (velocity indicated minimum drag) for a powered airplane one can't chuck at vimd because vimd is too high for you to chuck. So if your powered airplane is gliding well when you chuck ( for that matter an airplane which is slightly heavy and has higher wing loading, but without power system also this logic holds true) it, it means it is tail heavy. Period. If you launch such a plane she will be difficult to control and impossible to land. Unless ofcourse if you have the power come in high alpha with tail heavy config.
Gusty's Hangar and Introduction.

A Good pilot will practice until he gets it right,
A Great pilot will practice until he can't get it wrong.

Sumeet

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sameeroraut