tasesq

Hi Everyone,

Firstly Happy New Year! Thanks for all who have helped me over the last 12 months!

I have completed a basic dimensional case study for the design of a global express. I welcome all opinions please!!!

1. The scale was based around a choice between a Dyn-e-max fan (electric dynamax conversion) or a 90mm EDF fan.
2. I think the 90mm is the better option, as it provides a smaller airframe (approx 2m wingspan). The Dynamax lead to a 3m wingspan)
3. The smaller fan leads to smaller wing thicknesses - the smallest thickness was about 1.13cm out near the aileron centres. I could probably get a little more thickness by moving the servo in board, and moving the surface via a 45 degree hidden linkage.
4. All other thicknesses seem reasonable i think.

The BIG QUESTION is - What weight will the airframe end up and will the 90mm fan give enough thrust for this?

If anyone can help, here are my ideas for construction; a plug made from 3 views / CAD models, then figreglass fuselage with a few ply formers for strength. The wing will probably be built up / sheeted / glassed due to the internal requirements (slat actuators, flap actuators, and ailerson servos etc).

I can't upload the design study as a pdf file, so i will put it in the next post!

Thanks all for your input, and happy new year!

tasesq

OOPS! Turns out you can upload PDF files!!! Oh well.

Here it is in PDF format, as all the numbers were jumbled when I pasted them in in text.

Thanks for everyone's help!

Adibac

IMHO. Your main problem as stated in your big question is weight..... A balsa sheeted fuse will be lighter than fiberglass, There is a beautiful Turbine powered Learjet 35 built by someone in Europe, that was a great flyer, so it is just a matter of keeping it light and it will fly..