That is the plan. However, a small scale (low Re number) model is not a good representative of the drag of the full size plane. The Re number needs to be adequately high to the laminar flow to be sustainable. Fuselage though in the model is a bit easier than the wing though since it has longer chord length but the flight speed is still quite low and the Re is still far away from 41000000. Already dropping the Re to 20000000 increases the drag.
The model can be used for inspecting flying qualities and wing geometry (the contribution of the fuselage is small and in the scale model the effect of the fuselage is not even very realistic even if it was very accurate model of the 1:1 one).
Scale model is not good for estimating how fast and efficient the 1:1 plane will be.
See URL below for some neat papers on reducing drag of axisymmetric fuselages. Maybe a bit too complicated, but impressive results are claimed: http://tinyurl.com/d92d8q http://cafefoundation.org/v2/pav_enablingtech_dragreduction.php
Yeah, thanks for the links. I have read them already though (the Goldschmied papers and PAV papers), but it is good to get them shared them here on the blog if someone might not have seen them.
(And by the way, I have a friend that continuously sends me links to all kinds of AIAA etc. papers and I have hard time reading them all, not everybody blogs about them, but some people have collected a huge collection of those during the years)
5 comments:
Karoliina,
This looks very promising. Have you considered building a small scale model ? I would love to see how it flys.
Randolph
That is the plan. However, a small scale (low Re number) model is not a good representative of the drag of the full size plane. The Re number needs to be adequately high to the laminar flow to be sustainable. Fuselage though in the model is a bit easier than the wing though since it has longer chord length but the flight speed is still quite low and the Re is still far away from 41000000. Already dropping the Re to 20000000 increases the drag.
The model can be used for inspecting flying qualities and wing geometry (the contribution of the fuselage is small and in the scale model the effect of the fuselage is not even very realistic even if it was very accurate model of the 1:1 one).
Scale model is not good for estimating how fast and efficient the 1:1 plane will be.
See URL below for some neat papers on reducing drag of axisymmetric fuselages. Maybe a bit too complicated, but impressive results are claimed:
http://tinyurl.com/d92d8q
http://cafefoundation.org/v2/pav_enablingtech_dragreduction.php
Yeah, thanks for the links. I have read them already though (the Goldschmied papers and PAV papers), but it is good to get them shared them here on the blog if someone might not have seen them.
Might deserve to have a full topic about them.
(And by the way, I have a friend that continuously sends me links to all kinds of AIAA etc. papers and I have hard time reading them all, not everybody blogs about them, but some people have collected a huge collection of those during the years)
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