> > I tried the moving car method myself, but the road and engine noise
> > was so high that I wasn't sure how well the shield was working.
>
> Peter,
>
> It's best if you hang it out of a roof opening and get someone else
> (preferably) to coast at 10 to 30 MPH. I once tracked a South
> African Railways Class 25 condensing loco with an MKH 816 on
> a bush road at 90 MPH and got the full loco noises including
> the steam condenser fans and a burst of the whistle from the driver.
I mounted my home made SASS on the roof of the car because I didn't have a =
willing assistant, and our car is manual, so hand holding was out because I=
wouldn't be able to steer and change gears. I thumped on the roof each tim=
e I increased the speed by 10kmph, so I'd have a reference on the recording=
. I didn't have time for multiple runs, but I think next time I'd get it in=
to a higher gear so the engine's quieter, and perhaps find a smoother road.
I'll try and find the recording and post it for comment.
> > By my calculations, a 1m long arm rotating at 1 rev per
> second should
> > simulate a wind of about 6m/second.
>
> Yes, if you don't fall over dizzy. :-)
Good point. I was thinking of a tripod mounted, balanced arm, perhaps drive=
n by rope coiled around it. It would have to be very well balanced to achie=
ve 1 rev per second without it falling over.
Peter Shute
|