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HomeAircraftHelicopterAlignT-REX 700N › hanging on the pipe
04-08-2010 09:20 PM  8 years agoPost 1
se 450

rrNovice

hucknall,nottingham, uk

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hi guys
im i right in thinking that my os91 hz bottom needle is a little on the rich side ? ,cus when i flick in to thottle hold its hanging on he pipe if you no what i mean !

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04-08-2010 09:44 PM  8 years agoPost 2
BarracudaHockey

rrMaster

Jacksonville FL

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If its rat tat tating on the way down its the low end is too lean.

Some combos just do it even when the low end is right.

Andy
AMA 77227
http://www.jaxrc.com

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04-08-2010 11:57 PM  8 years agoPost 3
Paul Woodcock

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Dubai - United Arab Emirates

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Hi guys

I always thought it was when the low end was lean.

Regards
Paul

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04-09-2010 12:17 AM  8 years agoPost 4
jackheli

rrProfessor

Vancouver - Canada

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^^ +1
The low needle is lean.

Put the heli on idle and pinch the fuel line. It should take 5 seconds to start speeding up. If it speeds or dies off the bat it is lean.

It's easy to find an excuse to do wrong. Hard is not to find an excuse to do right.

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04-09-2010 02:35 AM  8 years agoPost 5
Tyler

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Chicagoland area

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If the engine is hanging on the pipe after being loaded and hammered, the top end is lean. The engine gets hot, the case heat soaks, and then the low needle fuel burns off too quickly. Curtis taught me this in person with two machines. Check the top end if it hangs when you hit throttle hold.

Tyler

Enjoy things that money can buy IF you don't lose the things money can't buy.

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04-09-2010 04:44 AM  8 years agoPost 6
jschenck

rrProfessor

La Vista, NE.

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yes, open up the mid range needle a couple of clicks and maybe the top end a couple too - possibly the low end a fraction.

Also make sure that throttle hold is set to an idle speed low enough to not let the clutch grab.

It should go to idle as soon as you hit throttle hold, if not you are lean.

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04-09-2010 05:46 AM  8 years agoPost 7
Tyler

rrElite Veteran

Chicagoland area

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You don't want to overcompensate for a lean high speed needle by opening up the idle needle. This will really screw things up and have you chasing your tail.

Tyler

Enjoy things that money can buy IF you don't lose the things money can't buy.

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04-09-2010 12:36 PM  8 years agoPost 8
BarracudaHockey

rrMaster

Jacksonville FL

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Jack and Tyler are both right.

Do the pinch test, if it doesn't run atleast 3 or 4 seconds before speeding up the low end is lean.

If thats ok then you're running the top end lean.

Andy
AMA 77227
http://www.jaxrc.com

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04-10-2010 08:51 AM  8 years agoPost 9
se 450

rrNovice

hucknall,nottingham, uk

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hi guys thanks for the comments so far !
i did a pinch test today it ran for about 6to7
secs or so then died off with out speeding up whats that mean ? many thanks again !

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04-10-2010 01:58 PM  8 years agoPost 10
BarracudaHockey

rrMaster

Jacksonville FL

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means your low end is maybe a whisper rich, and your high end is probably lean causing the machine gunning

Andy
AMA 77227
http://www.jaxrc.com

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04-12-2010 06:37 PM  8 years agoPost 11
jackheli

rrProfessor

Vancouver - Canada

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It could be the high end or the mid that is lean (or both).

In order to determine if the high end is lean do a full throttle climbout that will last aprox. 10 seconds and without stopping the climb hit hold and come down on an auto. If the engine does not cut immediately to idle and hangs from the start the top is lean.

In order to determine if the mid end is lean climb to a safe altitude and hover up there for aprox. 10 seconds. Hit hold and come down on an auto. If the engine does not cut immediately to idle and hangs from the start the mid is lean.

It's easy to find an excuse to do wrong. Hard is not to find an excuse to do right.

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04-12-2010 07:21 PM  8 years agoPost 12
Tyler

rrElite Veteran

Chicagoland area

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To load up and heat the engine for
top end needle adjustments I like to do four consecutive "blue angel" loops and hit throttle
hold just as I pass over the top of the last loop. Auto down and listen to the engine as the
heli comes in. Theotor
should drop right into an idle.

Enjoy things that money can buy IF you don't lose the things money can't buy.

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04-15-2010 05:49 PM  8 years agoPost 13
n808

rrVeteran

Seattle, WA - USA

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Also make sure that throttle hold is set to an idle speed low enough to not let the clutch grab.
After replacing the liner, I have a hard time setting idle low enough to not grab slightly. It's very easy to hold the rotor still though, and I figure it will eventually wear so it doesn't grab at all.
I thought the clutch and maingear were free from rotating along with the blades with a working one-way bearing..? When I had a stuck one-way, I could hear the engine being pulled along on the way down though.
To load up and heat the engine for top end needle adjustments I like to do four consecutive "blue angel" loops and hit throttle hold just as I pass over the top of the last loop.
Good idea. I didn't realize huge loops heated up the engine more than any other maneuver (I am capable of) until I started using the eLogger. The difference is most noticeable on my 90 (Trex 700), where it's 30-40F higher after a few such loops.

Karl.

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04-16-2010 12:05 AM  8 years agoPost 14
Gernejr

rrKey Veteran

Miami, Fl

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i use this but no 10 second as full punch out with 90 and i never see it again . I done 3 or 4 pitch pumps 20' -30' high then punch 150' hit throttle hold...

jackheli
In order to determine if the high end is lean do a full throttle climbout that will last aprox. 10 seconds and without stopping the climb hit hold and come down on an auto. If the engine does not cut immediately to idle and hangs from the start the top is lean.

In order to determine if the mid end is lean climb to a safe altitude and hover up there for aprox. 10 seconds. Hit hold and come down on an auto. If the engine does not cut immediately to idle and hangs from the start the mid is lean.

Sponsored by Visa

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04-16-2010 06:32 PM  8 years agoPost 15
jackheli

rrProfessor

Vancouver - Canada

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The 10 second period was just to make sure the carb is in the mixture ratio for the needle you are checking and has cleared any fuel left from other ratios...

It's easy to find an excuse to do wrong. Hard is not to find an excuse to do right.

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04-17-2010 03:24 AM  8 years agoPost 16
Gernejr

rrKey Veteran

Miami, Fl

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Jack i understand just funny with you 10 sec punch out and with on my eye never see my heli again. LOL

Sponsored by Visa

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04-17-2010 03:27 AM  8 years agoPost 17
n808

rrVeteran

Seattle, WA - USA

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Heck, if you've got a V-Bar or such, just let it go. If it belongs to you it'll come back by itself..

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04-17-2010 05:21 PM  8 years agoPost 18
jackheli

rrProfessor

Vancouver - Canada

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Jack i understand just funny with you 10 sec punch out and with on my eye never see my heli again. LOL
I am used to my 50s... not as much punch!

It's easy to find an excuse to do wrong. Hard is not to find an excuse to do right.

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