What are the consequenses of increasing tail moment in a Plane?
 

Hi all!
I am at present building two airplanes one is the MK Skystar 90 and the other one is Mk Arrow 60. After going through both the drawings I found out and noticed that the MK Arrow has a lesser tail moment then the Skystar. In other words that the fuse length in Skystar is almost similar to that of the Wing.

Now I feel I should increase the tail moment of Arrow as to have a better performance and smother aerobatics. What do you guys suggest on the same. I would appreciate good comments on the same. Engine used is a 60 Size Hanno with a tune pipe.

Regards

Sharad Goyal

RE: What are the consequenses of increasing tail movement in a Plane?
 

Hi Sharad,

do you mean tail movement or tail moment?

I presume you mean tail moment. In which case, you can certainly achieve good results by stretching the length of the rear half of the fuselage. I have a friend who had two Chilli Winds. The first was built as standard and was a great flying plane. However for the second model he built, he made the rear half of the tail longer such that the fuselage was about the same length as the wing. It flew better in our opinion.

Whether it will work as well with your model I do not know for such but it should be good. It will help with the smoothness of the tracking although you will loose out a bit on snap manouevres. However, properly set up this will not be a problem.

Good luck with the planes whatever you decide to do.

James

RE: What are the consequenses of increasing tail movement in a Plane?
 

Thank you for the reply and for the correction. Similar has been made on to the message also. Now they are few questions in mind what I would like to ask.

1. The orignal Fuselage length is 55" and the wing is 63" . Stretching of the fuselage will be by 5", now that will efect the CG also. Will the CG go back by 5 "?

2. Will the Incidence of the tail surface change?

3. I guess it will be tail Heavy also, what can we do with out adding additional weight to the nose?

4. Will the power to weight ration also change ?

Help middle of thinking process... Having sleepless nights .................:)

RE: What are the consequenses of increasing tail moment in a Plane?
 

a longer tali will make the plane smother on the elevator at least ...it will not effect where on the wing to place the cg.but the old Arrow is a is a really good flyer from that time i dont think u should make any modification...try tho keep the wheigth down and put an old (but good) 2stroke 10cc piped engine in it and just enjoy the 900 feet long slow rolls.