Google Groups no longer supports new Usenet posts or subscriptions. Historical content remains viewable.
Dismiss
scaling formulae
1 view
Skip to first unread message
jan olieslagers
Nov 16, 2009, 1:18:47 PM11/16/09
to
I seem to remember seeing formulae for scaling planes, but cannot find
them back. The one I do remember is "power required rises to the third
power of airspeed" - so to double the airspeed the engine power must go
times eight.
But there must be the same about weights and dimensions - if I double
the length and wingspan, empty weight goes up by so many percent and max
gross up by so many. Any pointers, please?
NB of course I am aware that such factors can only be estimates, there
being very many other parameters.
TIA,
them back. The one I do remember is "power required rises to the third
power of airspeed" - so to double the airspeed the engine power must go
times eight.
But there must be the same about weights and dimensions - if I double
the length and wingspan, empty weight goes up by so many percent and max
gross up by so many. Any pointers, please?
NB of course I am aware that such factors can only be estimates, there
being very many other parameters.
TIA,
Anyolmouse
Nov 16, 2009, 8:07:17 PM11/16/09
to
"jan olieslagers" <adelco_g...@skynet.be> wrote in message
news:4b019791$0$2864$ba62...@news.skynet.be...
Don't know if this will help you. It is mainly about scaling down
wings--
http://www.nurflugel.com/Nurflugel/n_o_d/oldstuff/html/theory/theory_basic.htm
--
We have met the enemy and he is us-- Pogo
Anyolmouse
brian whatcott
Nov 16, 2009, 8:21:12 PM11/16/09
to
Scaling rules are usually presented as dimensionless ratios in order to
free them from any nominal size parameters. There are plenty - perhaps
50 common ones, but not all apply to aircraft. You are certainly
familiar with one called Reynold's number. I took a quick look for my
poster dispaly of these ratios, but can't put my hands on it presently....
Brian W
0 new messages