iron eagel
Posts: 1267
Joined: 7/15/2004
From: Middleboro, MA, USA
Status: offline
|
Lyndon, no problem glad to help!
The control surface throws are as follows:
Low rate:
ailerons 1 inch up 1 inch down
elevator 1 1/4 inch up 1 1/4 inch down
rudder 1 7/8 inch left 1 7/8 right
High rate:
ailerons 2 inch up 2 inch down
elevator 2 inch up 2 inch down
rudder 2 1/4 inch left 2 1/4 right
Measurements were taken as follows:
Aileron at inboard trailing edge.
Elevator at widest inboard trailing edge
Rudder at the widest lower trailing edge
This is an aerobatic plane the thrust angles are all at zero to the datum.
Edit to add.
As far as the airfoil it is symmetrical and does not have camber I have scans of the original ones near the start of the post. It is 2 11/32 at the thickest point and is offset 5/32 of an inch above the datum line. The cord at the root is 15 3/8 inches and at the tip the cord is 12 5/8 the wingtip, so the UH at the root is 1 3/32 and the lh&ch would be -1 1/4 inch (?) with le and te height being zero or there abouts....
As far as E power
A far easier way to size you motor is using wattage vs weight, for an aerobatic airplane a good rule of thumb is 150 to 200 watts of power per lb with 150 watts/lb being the sport/aerobatic end, and 200 watts the aerobatic/3 d end of the spectrum. So if you were to say you have a RTF weight of 5 lbs you would want 750 to 1000 watts of engine power to the prop. Personally I would use an Axi 4120 with a 60 amp controller fueled by around 20 volts of a123 cells they have a high discharge rate and can take the type of current drain that a 40 sizes airplane requires and can supply the type of power you need. The Axi 4120/18 (If I recall the one I used) is similar in power to a .60 size glow. The reason for the larger motor and high current is, that at normal cruise speeds you could get upwards of 20 min of flight time, longer if you are not beating on it. The left stick is the final arbiter here as far as flight time or power use, the less you beat on it, the less you will shorten your battery life. I used a similar setup for my wifes LT-40, and that is what I would use in my SE if it were electric.
Good luck now off to my build now...
Paul
< Message edited by iron eagel -- 2/22/2008 6:43:48 AM >
_____________________________
The Wrights never crashed, they only had hard landings. I 've had some hard landings myself. AMA EAA AOPA revver #185
|
Printable Version
All Forums >> RC Airplanes >> Kit Building >> RE: Yet another Sig Something Extra Build 
RE: Yet another Sig Something Extra Build - 
