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HeliTorque Forum Index » Flight Dynamics

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haggishunter
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PostPosted: Tue Jan 06, 2009 7:08 pm    Post subject: Reply with quote

I'll be at Booker Mon/Tues so may see you there.
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James T Lowe
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PostPosted: Tue Jan 06, 2009 7:17 pm    Post subject: Reply with quote

Chickenhawk wrote:
There are indeed two emergency lamps right near there which are quite powerful but will also completely drain the battery if left on for more than oooh I don't know... half a second!


Yeah, and if you inadvertantly put them on whilst in flight, you'll find an alternator light appear - it can't produce enough charge to counter the drain from the lights....

I only worked that out after I'd landed... Embarassed

Still, it's experience. Very Happy
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JeffHall
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PostPosted: Tue Jan 06, 2009 8:01 pm    Post subject: Night Emergency Lamps Reply with quote

The Raven I I've been flying has these fitted, two lamps mounted on the rear cross strut and relays etc.

One thing I've noticed is the lamps seem to be switched on with some sort of push-button which unless its a latching type doesn't seem to have a means of switching it off again? (I've not been brave enough to try the switch!)

I've also noticed that we tend to fly about with the CB's pulled - no point in having the circuit live if we're not night flying I guess?

What puzzles me though is how much current do they take if they can kill the alternator output?... Geez they must either be bright or the alternator doesn't make much juice? The bulbs look very similar to automotive 12v 70W foglamp bulbs and even my maths reckons about 6amps each - surely 12amps draw doesn't max out the alternator?

Does anyone know the spec's of the bulbs / alternator?

Jeff Hall
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haggishunter
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PostPosted: Tue Jan 06, 2009 9:32 pm    Post subject: Reply with quote

Jeff,

The buttons in the centre next to the collective can be pressing in and out switching the lamps on and off. It's normal to fly with the CB's pulled to prevent flying with one or both lights on, like the landing lights they burn out easily if left on in the hover (no ram air cooling).

I flew a Raven I once with nav, strobes and landing lights on. I put the spots on out of interest and right enough the ALT warning light came on. With all the equipment on the alternator and battery are under alot of load. The alternator is rated at 14V output on a 12V system, and 28V on a 24V system if I am right in thinking.

When you use them at night for a forced landing they will be running striaght off the battery, as no engine, no alternator. For a couple of minutes in autorotation they will be fine. There is no need to use them for normal landings/approaches with a functioning landing light.

Best to avoid swithcing them on and off, the bulbs are not cheap since they are a specific aircraft component... even though you can get the same ones in Halfords....

As I mentioned in a previous post I preferred the flares, you could fire them individually, one at 1000' and the other at 500'. Landing areas were illuminated well (if they landed in the right spot) and stayed lit for a good period of time, it also was a good confirmation of wind direction.

The lights mean a constant attitude EOL as to be done to keep the ground lit as the lights are in a fixed position.

HH
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afterburner
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PostPosted: Tue Jan 06, 2009 9:44 pm    Post subject: Flight Dynamics Reply with quote

Haggis,

I have to compliment you. Your knowledge of the Robies is astounding at times. Was most of your training time in Robies?

AB
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haggishunter
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PostPosted: Tue Jan 06, 2009 9:52 pm    Post subject: Reply with quote

AB,

I thank you for your comment. I first started flying Robbies 8-9 years ago, but I also learnt from the best, not all self taught knowledge. Still fly them now and then for a bit of fun away from the world of autopilot and stab systems when back home.

Still lots to learn though... there always is!

HH
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PostPosted: Tue Jan 06, 2009 9:55 pm    Post subject: Reply with quote

HaggisHunter wrote:
.....I thank you for your comment. ..........
Still lots to learn though... there always is!

HH


Your welcome.
A good pilot never stops learning.
One who does, usually becomes a statistic.

Fly safe and keep your feet out of the water.

Laughing
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animalsticks
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PostPosted: Tue Jan 06, 2009 10:50 pm    Post subject: Reply with quote

HH do you have a knack for remembering such info or have you found the secret to retaining info you don't use a lot?

i'm asking as i find once a book is read, unless i use the information regularly, i either forget it or it becomes confused with other info. Confused Rolling Eyes

am igetting old?
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haggishunter
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PostPosted: Tue Jan 06, 2009 11:15 pm    Post subject: Reply with quote

Never really thought about it, but I guess I do remember random things, facts and numbers etc... weird!

HH
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PostPosted: Thu Jan 08, 2009 11:25 pm    Post subject: Reply with quote

too much time on stand-by maybe Cool
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Jen
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PostPosted: Thu Jan 08, 2009 11:29 pm    Post subject: Reply with quote

It's that chip he got put in. I'm saving up for one
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PostPosted: Sat Feb 14, 2009 9:39 pm    Post subject: Reply with quote

Yeah, but HH had the chip put on his shoulders ....he he he..............(slinks away carefully)
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haggishunter
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PostPosted: Sun Feb 15, 2009 12:04 pm    Post subject: Reply with quote

For those of you whome may have not realised, I know HW very well and that is the only reason he scrapes away with taking the piss... damn Aussies.
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PostPosted: Sun Feb 15, 2009 12:06 pm    Post subject: Reply with quote

......when does anyone ever get a serious word out of me......
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PostPosted: Sun Feb 15, 2009 12:17 pm    Post subject: Reply with quote

Hey! Say hi to Richard from Jane (Browne) - (me and blme used to work at HeliAdventure Hawarden).

CW
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