Fuel flow incorrect?
Printed From: Just Flight Forum
Category: Just Flight Products
Forum Name: HS 748 Propliner
Forum Description: Discussion area for HS 748 Propliner
URL: http://forum.justflight.com/forum_posts.asp?TID=31429
Printed Date: 23 Apr 2024 at 11:40pm
Topic: Fuel flow incorrect?
Posted By: keithb77
Subject: Fuel flow incorrect?
Date Posted: 24 Apr 2017 at 12:10pm
Hi, very nice looking plane  But as an http://www.fseconomy.net" rel="nofollow - FSEconomy user I have a concern with the fuel flow, it seems to be pretty much locked at around 370 GPH, I can make large power changes without change to the fuel flow. In real life it should be around 210-220 GPH (US) I think. 370 GPH and 1440 gallons = less than 4 hours aloft and a significant reduction range and increase in fuel costs  I could play with the fuel flow scalar but maybe I'm doing something wrong? Fuel trimmers would be a possibility but I don't think they are modelled. Nothing about this mentioned that I can see in the upcoming patch notes, except maybe FDE improvements. Cheers Keith
|
Replies:
Posted By: Martyn
Date Posted: 24 Apr 2017 at 1:31pm
|
Hi Keith, What altitude/power settings are you using? I've just checked using the latest build (currently in late testing) and at FL150 with 14000 RPM (190 KIAS) I am seeing approx. 1560lbs per hour, or 230 GPH. Thanks Martyn ------------- Martyn Just Flight Ltd |
Posted By: keithb77
Date Posted: 24 Apr 2017 at 5:04pm
|
It was over a range of settings...but I've just been notified of the SP2 update so I will download and retest that one :) Cheers Keith
|
Posted By: keithb77
Date Posted: 25 Apr 2017 at 1:27pm
|
Martyn, Using SP2 now - but I can't even get to 14,000 RPM at 15,000 ft, the best I can get is 13,840 RPM at max throttle which gives 280 KTAS (from the Z display) and 370 GPH.
Throttling back to 9,480 RPM gives 230 GPH at 250 KTAS, a bit further to 9,000 RPM gives 200 GPH and 198 KTAS. I'm happy with the speed/GPH at cruise...but the displayed RPM may be too low? At higher throttle settings the GPH stays at 370 whilst the RPM varies with throttle... Cheers Keith |
Posted By: keithb77
Date Posted: 25 Apr 2017 at 6:36pm
|
Also I note the .air file hasn't changed, despite there being 'FDE improvements' ... is that correct? I uninstalled again and checked the folder was empty before rereinstalling.
And I find it very difficult to get her on to the ground, really doesn't want to slow down in the air... Checked RPMs and handling against the old Rick Piper freeware - which seems to be correct... Cheers Keith |