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Bell 206 Long Ranger Engine Question?  
User currently offlineMr Spaceman From Canada, joined Mar 2001, 2787 posts, RR: 9
Posted (11 years 2 months 1 week 6 hours ago) and read 3911 times:

Hi guys.

I've always liked helicopters (because they fly), especially the fast, sleek looking ones. I've been up in a Bell-47 on 5 different occasions .... not exactly sleek, but lots of fun!

I remember spending around 6 hours on the outdoor observation deck of the Empire State Building around 15 years ago and seeing more helicopters flying around than I knew existed. I can only imagine what it's like there now.

Here in Toronto, there's a Bell Jet Ranger (it might be a Long Ranger), that flys over my home almost every day of the week because it belongs to a news company that's based just down the street. Because of that helicopter, I have a question of pure curiosity.

In the first photo below, what are the two copper coloured canister type objects that are located below the exhaust stacks.


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Photo © Person Emmanuel



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Photo © Person Emmanuel



Chris  Smile







"Just a minute while I re-invent myself"
5 replies: All unread, jump to last
 
User currently offlineSinlock From United States of America, joined Dec 2000, 1637 posts, RR: 2
Reply 1, posted (11 years 2 months 6 days 23 hours ago) and read 3784 times:

Here is a SIMPLE explanation,

The engine your looking at is a TwinPack Allison-250-C20R. I consists of two A-250's that join at the Rotor transmission. This engine it a Turboshaft, all of it's power is used to turn a driveshaft, not like most engines that produce thrust.

The "two copper coloured canister type objects" are the burner cans. (Nickel is the alloy that gives the copper color)

The compressed air from the compressor section, flows down the two "tubes" on the sides of the engine. When the air reaches the burner can the air is mixed with the fuel and then ignited. At the same time the airflow is turned 180degs so it is now going towards the front of the aircraft. The burnt mixture then flows through the Hot section, spinning the turbine that is linked to the gearbox.

If you look at the first picture, You'll see to lines leading to the burner can. The line with the brown insulation is the fuel line. The other line with the silver braid is the for the igniter plug.


Here is a site that will give a little more info.
http://www.rolls-royce.com/helicopters/products/pdfs/M250_C20R.pdf

If you need more (or less) detail just ask.



My Country can beat up your Country....
User currently offlineMr Spaceman From Canada, joined Mar 2001, 2787 posts, RR: 9
Reply 2, posted (11 years 2 months 4 days 8 hours ago) and read 3679 times:

Hello Sinlock.

Thank You for your reply. Your information and the link you provided are excellent. There's nothing like a visual diagram of an engine (especially a cut-away), or other aircraft systems to help you understand how things are designed and work.

Diagrams help to melt away mental blocks.  Big thumbs up

The very first question I ever posted in this forum was about PT6A Turboprop engines. I learned from that thread that the PT6A is a Reverse Flow engine, thus the intake air does a 180 degree turn at the rear of the engine compartment before it enters the compressor stage of the jet engine. I learned a lot more about the PT6A (such as the initial separator, etc), and could tell that the Allison-250-C20R engines in the Bell 206 Long Ranger L1-ST were a completely different ball game because of the location of what I suspected were the burner cans (the copper coloured objects).

A very interesting engine design indeed.


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Photo © Jochen Thoma



Thanks Again,

Chris  Smile



"Just a minute while I re-invent myself"
User currently offlineMr Spaceman From Canada, joined Mar 2001, 2787 posts, RR: 9
Reply 3, posted (11 years 2 months 4 days 8 hours ago) and read 3689 times:

Hi again.

Oops, I meant to say Inertial Separator in my last post .... not Initial Separator.  Nuts

I'll be OK .... I hope!


Chris  Smile



"Just a minute while I re-invent myself"
User currently offlineSinlock From United States of America, joined Dec 2000, 1637 posts, RR: 2
Reply 4, posted (11 years 2 months 2 days 11 hours ago) and read 3647 times:

I'm glad I could help,

Here's a quick tip. If your looking at a Ranger and it has two window panels (One on the cockpit door and one the cabin) its a Jet Ranger. If your looking at one with 3 window panels (One on the cockpit door and 2 on the cabin) it's a Long Ranger.


P.S. About the Inertial Separator thing, I knew what you ment and I try not to criticize members that know what there trying to say.  Smile/happy/getting dizzy



My Country can beat up your Country....
User currently offlineMr Spaceman From Canada, joined Mar 2001, 2787 posts, RR: 9
Reply 5, posted (11 years 2 months 2 days 7 hours ago) and read 3678 times:

Hello Sinlock.

Thanks for your tip about how to quickly tell the difference between a Ranger and a Long Ranger. I'll never forget that tip.  Big thumbs up

Bell 206 Jet Ranger (2 windows).


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Photo © Pertti Sipilä



Bell 206 Long Ranger (3 windows).


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Photo © Den Pascoe



I was going to use your tip to figure out what model of the Bell 206 the TV News Station down the street is flying (it's been up a lot yesterday & today covering the murder of a 10 year old girl), however, I found out through their website that their helicopter is a Bell 206 B Jet Ranger.

Here's some photos of her.

http://www.cftonews.ca/chopper.htm

Chris  Smile



"Just a minute while I re-invent myself"
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