Jump to content

250-C20W higher burn rate


Recommended Posts

Have you checked the autorotation Nr? If it's not right, it can affect fuel consumption among other things. How do the N1 and TOT numbers compare to the other aircraft? How do the airspeed numbers compare? Has the torquemeter been calibrated with a deadweight tester?

 

That said, some engines just burn more fuel than others.

Edited by Gomer Pylot
Link to comment
Share on other sites

Have you checked the autorotation Nr? If it's not right, it can affect fuel consumption among other things. How do the N1 and TOT numbers compare to the other aircraft? How do the airspeed numbers compare? Has the torquemeter been calibrated with a deadweight tester?

 

That said, some engines just burn more fuel than others.

 

Not enough information to pass-on anything but a personal experience with the Shadin. However, comparing N1 and TOT is an excellent way to start troubleshooting.

 

Had that problem with our Shadin unit. Shadin claimed the problem was that our unit was hooked to an existing fuel-flow transducer rather than installed as a system with a new transducer supplied by them. After talking to other users, there're other reasons for inaccuracy.

 

Things to check for are electrical noise. You may have to shield the transducer output wire. Installation variations may require you to reset the unit's K factor.

 

The fuel-flow transducer should be mounted upright, which is the position it was in when initially flow-checked and calibrated. Inside your engine compartment rather than on a flow bench, vibration, heat or even a trapped air bubble can change the K factor.

 

The Shadin installation manual doesn't cover resetting the K factor. To reset it, you need to measure your actual-vs. -Indicated fuel-burn and call the factory tech-support line and let them figure a new K factor and tell you how to reprogram the unit.

 

NOTE: The shadin's accuracy, they say, is around 2-5%. If you're talking about a Bell 212 at 100gals/hr you're in the ballpark. However, if your talking smaller ships like a Bell 206 at 28gals/hr you're off about 18%.

Edited by iChris
Link to comment
Share on other sites

Park brake partially on?

 

Choke left OUT?

 

Mixture in Rich instead of Auto Lean?

 

But you already have the answer - check the auto revs. When it has been in service a long time, numerous blade trackings are solved by flying the low blade up, so the end result is smooth blades but excessive pitch, leading to increase profile drag.

 

Be careful when you roll off the throttle to check auto revs, the RRPM may continue to decay and you need to roll that throttle back on fairly smartly.

Link to comment
Share on other sites

  • 11 months later...

Oh, you mean the keyring holder. :rolleyes: That has other uses? :lol:

Key ring ? NO it is a choke the FI. told me along time ago :) Eric I have noticed that draft as well, strange

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
 Share

×
×
  • Create New...