# solution

3. (Adapted from Etkin and Reid, 2.5) The following data apply to a 1/25th scale wind tunnel model of a transport airplane. The full-scale mass of the aircraft is 22,680kg. Assume that the aerodynamic data can be applied to the full-scale vehicle. For level unaccelerated flight at V=239 knots (123 m/s) of the full-scale aircraft, under the assumption that propulsion effects can be ignored, (a) Find the limits on the tail angle it and CG position h imposed by the conditions Cmo and Cma <0. (b) For trimmed flight with de = 0, plot i vs. h for the aircraft and indicate where this line meets the boundaries in part (a). Geometric data â€¢ wing area S = 0.139mÂ² (so need to scale this are up by 252 â€“ lengths scale by 25) â€¢ wing mean aerodynamic chord c = 15.61cm â€¢ l = 38.84cm Tail area St = 0.0342mÂ² Aerodynamic Data (does not need to scale) â€¢ Cl, = 0.077/deg (convert to radians) â€¢ Cle = 0.064/deg â‚¬ = 0.72Â° â€¢ deg/da 0.30 â€¢ Cme = -0.018 â€¢ ha=0.25 (notes page 2-4) â€¢ p= 1.225kg/m3

## Attachments:

phpi6vp8d_5232808714885977932.png

## Why US?

##### 100% Confidentiality

Information about customers is confidential and never disclosed to third parties.

##### Timely Delivery

No missed deadlines – 97% of assignments are completed in time.

##### Original Writing

We complete all papers from scratch. You can get a plagiarism report.

##### Money Back

If you are convinced that our writer has not followed your requirements, feel free to ask for a refund.