Plane won't acelerate with tail fin placed in engine exhaust

[lyco]

System: Windows 64bit, KSP v1.0.0 32bit, Steam

I tried to build plane inspired by Heinkel He 162, the early German jetplane with one engine placed at the top of the fuselage. Craft file at http://leteckaposta.cz/665485466 screenshot at http://steamcommunity.com/sharedfiles/filedetails/?id=433795755 Note the tailfin placed exactly behind the jet engine.

When I start the plane's engine, the plane doesn't move, unles the tailfin is actuated. F3 report also tells me the tailfin has been damaged (which I expect and definitely is not bug). When the engine is left to run at max power for about a minute, the tailfin suddenly explodes and the plane instantly starts moving. When yaw control is used (with the tailfin still attached), the plane jerks, rolls partially and starts moving with reduced speed.

I would think that in reality, the air would flow around the tailfin mostly undisturbed (unless the tailfin would be used to steer). In KSP, it looks like the thin fin blocks the exhaust. Is this a limitation of the aerodynamics model, or is it some kind of bug?

[sal_vager]

Uh, this is how the game works, sorry, if you block the thrust they won't work.

Some engines, like RCS thrusters don't cause damage so are unaffected, but most engines in KSP just won't provide thrust while blocked.

So yeah, it's a limitation of the game, it's been like this since the very early days so is unlikely to change, but we can still do some neat stuff like propel Kerbals through the air using rocket thrust, as they are separate "vessels"

Edited April 28, 2015 by sal_vager