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HeliTorque :: View topic - how good does it feel
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HeliTorque Forum Index » Wannabes

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Logan
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PostPosted: Thu Oct 30, 2008 5:54 pm    Post subject: how good does it feel Reply with quote

i need to here first hand accounts of the first time you got to startup a turbine heli!
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haggishunter
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PostPosted: Thu Oct 30, 2008 6:00 pm    Post subject: Reply with quote

Not very, I was thinking "if I over temp it... my boss ain't going to be happy with the bill!".

HH
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WindSwept
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PostPosted: Thu Oct 30, 2008 6:06 pm    Post subject: Reply with quote

I think its much nicer hearing someone else start a turbine heli. Its awesome. Sounds so much like a 'proper' helicopter not an egg whisk! However as HaggisHunter said i would be super woried about overtemping as they are delicate things!
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haggishunter
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PostPosted: Thu Oct 30, 2008 6:21 pm    Post subject: Reply with quote

You get the hang of it after a couple of goes, I am lucky, I now press a button and move a leaver 1 inch, no worries.

It is a nice sound, especially older engines like Alison 250's (B206, MD500 etc.)

However I do love the smell of burning Jet A1 in the morning!
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Logan
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PostPosted: Thu Oct 30, 2008 6:23 pm    Post subject: Reply with quote

overtemping? tried to wiki the definition..... might need some help with that one sorry
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PostPosted: Thu Oct 30, 2008 6:29 pm    Post subject: Reply with quote

to light up the engine you add fuel, the combustion generates heat which if too hot can damage the turbine section of the engine, more fuel, more heat. a small amount goes a long way! also called a hot start.
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PostPosted: Thu Oct 30, 2008 6:35 pm    Post subject: Reply with quote

ohh ok,sorry, that makes sense! I was hoping it'ed be easier then the piston, or atleast i thought it was upon startup! None the less it will sound cool!
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PostPosted: Thu Oct 30, 2008 7:48 pm    Post subject: Reply with quote

Whats the proceedure for starting the Twin Squirrel and/or the S92.

Do you just check full and free with the throttles then put them to idle and switch on the fuel pumps and hit start or something?

I know the helimed A109 litrally just hit a button and bish bash bosh.
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PostPosted: Thu Oct 30, 2008 8:07 pm    Post subject: Reply with quote

The start procedure the 355 can variey dependant on which model it is F1/2, N, NP. The F1/2's that I used to fly was like starting 2 jetranger engines, very similar procedure.

Throttle in STOP
Press starter
15% Ng avance to IDLE
52% (I think) release starter
Advance throttle to 70% for 1 min.
Advance throttle to FLIGHT

There's other switches etc. but that's the basic procedure.

In the S-92 which is FADEC:

Fuel X-FEED or DIRECT (as req'd)
Throttle STOP
Press starter
Throttle to IDLE when TGT is <150 degrees
Does everything else itself....
Once started, advance throttle to FLY.

Again the basic jist of starting one of the engines.

The engine starters are driven by air, either from APU or external air source.

All machine are different, but nowadays with FADEC and advance in technology they are all getting more similar to start. We use to be able to get airborne in the EC120 in 2-3mins, and it is all manual starting/throttle/fuel flow control, easy machine.

HH
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PostPosted: Thu Oct 30, 2008 8:19 pm    Post subject: Reply with quote

Ahhh the SK sounds very similar to the A109, they just set throttle to start, make sure its on x-feed and pumps are on and hit the starter and then the FADEC does it all. The WNAA can get started it something rediculous like 45 seconds and are usually airbourne in like a minute and half (give or take traffic)
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PostPosted: Thu Oct 30, 2008 8:34 pm    Post subject: Reply with quote

Most air ambulances that use EC135's, MD902's etc are FADEC controlled.

Most use fast start Pratt and Whitney engines. The newer 109's have what looks like cooker knobs. They just twist to idle and up she fires.

Apparently Even though the FADEC controls the start sequence, an eye should be kept on the temps just in case of a hot start.
I believe, happy to be corrected, a hot start can occur with a low battery current as well and failure to keep the ignitors on before the engine self sustains.

I'm no expert but things I have picked up in the past.
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Logan
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PostPosted: Thu Oct 30, 2008 8:57 pm    Post subject: Reply with quote

so awesome, i cant wait till i get to be in a 206 when it starts!
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PostPosted: Thu Oct 30, 2008 9:39 pm    Post subject: Reply with quote

I like that... the "FLY" button!! Sounds foolproof enough. Laughing

I was fortunate enough to get a baptism of fire starting up 206's just after getting my rating through... A whole day of ground runs on four JetRangers!

It was nerve-wracking to say the least. Not just one "I'm pressing the button but I hope to god this doesn't hot start", but a whole day of it! Joy! And not a single flight, but what a great way to get used the to the start-up.

I experienced a couple of dodgy batteries that day and even one tow-cart battery that was too flat to use! Good practice in decision making. Every start requires your full attention but they do get easier.

And they sound is great, agreed! Smile

Sarah
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oi_martin
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PostPosted: Thu Oct 30, 2008 11:23 pm    Post subject: Reply with quote

Its that Whoosh when the fuel gets dumped into the engine I like. Most times I hear them is from outside and that sounds great.

Its the Allison engine thing.
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hendrik
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PostPosted: Fri Oct 31, 2008 6:49 am    Post subject: Reply with quote

I can only dream of starting one of these mean machines one day........sighhhh.
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