Classic British Flight Sim

airboatr wrote: ↑

06 Oct 2017, 08:46

As to the device being over kill... the idea behind the device is to garner attention. And It most certainly does do that.

I'm sure it does, but is it not also robbing the engine of 25% of it's power at the same time?

Regards

Kevin

Kevin Farnell wrote: ↑

07 Oct 2017, 01:16

airboatr wrote: ↑

06 Oct 2017, 08:46

As to the device being over kill... the idea behind the device is to garner attention. And It most certainly does do that.

I'm sure it does, but is it not also robbing the engine of 25% of it's power at the same time?

Regards

Kevin

That's what I've been wondering. Maybe the horn happy yo-yo's on the streets today might lay off the horn if they knew it would tax their engine's power.

Brian

It's not really noticable, under normal use. The valve is only open for a few seconds.
It has more of a chortle sound than a whistle though; and it's loudest at speed
https://youtu.be/HzB3aAmj2v0
But it's not like it robs so much power from the engine that you'll get a sensation that your going to go through the windscreen

Dave , that gold star medal is the military volunteer gold star.
In case the missus asked what you are volunteering her up for..

Tootdaloo

AirB , thanks for explanation of the Volunteer medal . Strangely enough the gold and green centre stripes are 31 sqdn colours ....... And
Norwich City football club ; aka The Canaries . '' On the ball city '' [ for those of a certain age from the Eastern Counties ] .
Great vid showing horn in action ; and a not bad sounding of the Doppler principle in action . ....An apparent frequency change as the source moves towards and away from you .
Doppler powers the drift and ground speed dial in the Trident cockpit . And the moving map . And the auto drift shutter on the HSI / DI ...
Seem to remember there were 2 aerials pointing forward and out . And 2 pointing rearwards and out [ 'Janus' priciple ? ] Transmitted on front 2 , bounced off the ground and received on back 2 . Apparent frequency shift measured , 'pooted , and displayed / used . Worked really well on Trid . Calm seas were only thing to fox it ....Not often round Europe .
Our 737-200s were fitted with Doppler , but not so good . Rumour was we went cheap and got helicopter units ...maxed out at 250 kts g/s. No good at 600 .
Brian , thanks for link to Flickr , I'll practice in the dark nights to come .

rgds dave f .

AirB ,
PS , 'T missus used to got out with a ' Royal ' [ think that's short for Royal Marines ] .

Does that count as volunteering ?

rgds dave f .

dfarrow wrote: ↑

08 Oct 2017, 20:36

AirB , thanks for explanation of the Volunteer medal . Strangely enough the gold and green centre stripes are 31 sqdn colours .... .

rgds dave f .

Nothing intentional on my part, but I'm glad it worked out that way.

I'm not qualified to answer the last question.

The Doppler thing is a interesting subject though...