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TOPIC: Sea Hornet F.20 high fuel burn

Sea Hornet F.20 high fuel burn 4 years 8 months ago #31309

Hi all and seasons greetings :)

I have been test flying the Hornet series to get the basic data in FSX, actual in-sim ranges, payload etc and one of the things I note is, of course, fuel burn.

This has been unusually high in the F20.

At full payload (i.e. MTOW) with full fuel, I get the following results:

F.1 = 2230 pph
F.3 = 2240 pph
NF21 = 2069 pph
F20 = 5998 pph!! :ohmy:

They all have differing amounts of max fuel, but the same max weight - which is fine, as they are different variants, but the F.20 runs out of fuel after just 39 minutes! I've tried it on 3 flights to make sure the data was right. I keep the boost within the green range asap after take off.

Maybe a figure error slipped in there somewhere?

JD
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Re: Sea Hornet F.20 high fuel burn 4 years 8 months ago #31310

Just had a quick look at the aircraft config files and although it is noted that this version carries less fuel:
Sea Hornet F 20s also incorporated the modifications of the Hornet F 3, although the internal fuel capacity was 347 Imp gal (1,557 l), slightly reduced from that of the F I. In total, all of the modifications added some 550 lb (249 kg) to the weight of the aircraft. Maximum speed was decreased by 11 mph (18 km/h)

I think the amount less listed in the fuel data is a bit much:

Standard Hornet (i.e. all other variants)-
[fuel]
Center1 = 4.000, 0.000, 0.000, 96.000, 0.000
LeftMain = 1.000, -2.080, 0.000, 168.000, 0.000
RightMain = 1.000, 2.080, 0.000, 168.000, 0.000
external1 = 1.000, 10.300, -1.200, 100.000, 0.000
external2 = 1.000, -10.300, -1.200, 100.000, 0.000
fuel_type =2
number_of_tank_selectors=1
electric_pump=1
fuel_dump_rate=0.02000
anemometer_pump=0
manual_pump=0
engine_driven_pump=1


Sea Hornet F20 variant:
[fuel]
Center1 = 4.000, 0.000, 0.000, 46.000, 0.000
LeftMain = 1.000, -2.080, 0.000, 168.000, 0.000
RightMain = 1.000, 2.080, 0.000, 168.000, 0.000
external1 = 1.000, 10.300, -1.200, 100.000, 0.000
external2 = 1.000, -10.300, -1.200, 100.000, 0.000
fuel_type =2
number_of_tank_selectors=1
electric_pump=1
fuel_dump_rate=0.02000
anemometer_pump=0
manual_pump=0
engine_driven_pump=1

Is this the cause, perhaps?

JD
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Re: Sea Hornet F.20 high fuel burn 4 years 8 months ago #31321

  • Rich
  • Rich's Avatar
Have you tried the Alternative Hornet FDE sets available here in the Other section in the Library or do a search on avsim using ruscoe as the search keyword


classicbritishfiles.com/index.php?option...unc=fileinfo&id=1897
Last Edit: 4 years 8 months ago by Rich.
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Re: Sea Hornet F.20 high fuel burn 4 years 7 months ago #31324

Hi Rich,

I wasn't aware of those, but will now give them a try, thanks.

JD
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Re: Sea Hornet F.20 high fuel burn 4 years 7 months ago #31327

  • Miggers
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WOW!!.

That really is a greedy brute.

I don't have FSX JD,so I can't try it for myself,but with a two speed two stage Merlin I usually
budget for about 40-45 gph max(Spit IX/XVI with a 60-70 series driving a 4 blade Rotol).

Of course,it's all relative to power/pitch/mixture/rad shutter settings,but that's with warm up,
,mag checks, t/o,1 hour-ish transit to venue,10 minute display slot,circuit and landing.

A Lanc will easily use a bit less than 200gph if you handle it correctly,I know that's with
Merlin XX series engines(two speed single stage blowers),but she's a big heavy old girl
that can be flown with quite a bit of flair.

Mark
CBF Alpha/Beta Test Pilot

CBF Chief Fighter Pilot

IL2 Messerschmitt 109 ace

Holder of the Knight's Cross with Oak Leaves,Swords and Diamonds.
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Re: Sea Hornet F.20 high fuel burn 4 years 7 months ago #31350

  • Rich
  • Rich's Avatar
JD_LincsUK, fuel burn is adjusted by fiddling with fuel_flow_scalar= in the aircraft.cfg , decreasing the number reduces fuel burn

[GeneralEngineData]
engine_type = 0
fuel_flow_scalar= 0.3575 <<<<<<<<<<<<<<<<<<<<<<<<
min_throttle_limit = 0.000000
engine.0 = 7.700, -7.060, 0.000
engine.1 = 7.700, 7.060, 0.000
Last Edit: 4 years 7 months ago by Rich.
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Re: Sea Hornet F.20 high fuel burn 4 years 7 months ago #31352

Yeah, I'd guessed as much, but I must admit, I've never seen any setting other than '1' - and that's what these are set to as well.

I was thinking that the main issue in this case was that the fuel amount set in the F20 was only about half that in the others, so didn't need to mess with the other settings.

It will be useful to know for the future, mind. It would also be nice to know what '1' refers to!

I guess adjust, test, readjust will be the order of the day.

JD
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Re: Sea Hornet F.20 high fuel burn 4 years 7 months ago #31365

  • Rich
  • Rich's Avatar
The alternative aircraft.cfg's are not set to 1 in fuel flow entry the 3 models have different entries to reflect 3 different ranges.

1 is I believe a Fs default fuel burn as that figure is a scalar of the default, 1 being the datum add to it burn goes up subtract and it goes down.

Did you actually try the alternative FDE's ?? not much adjusting needed there
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Re: Sea Hornet F.20 high fuel burn 4 years 7 months ago #31366

Yes I did test the other configs and they are better.

As the F.1 model wasn't included I adjusted that myself and it now seems about right - though only in fuel burn - I would have to do further research to see if the total fuel amount is correct. One sort of assumes that the model developer will get that sort of thing right from their own research, though I know that isn't always the case, even on some payware models (no names... ;) )

JD
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Re: Sea Hornet F.20 high fuel burn 4 years 7 months ago #31394

  • Rich
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The F1 was not included because it was not released or modeled at that time, the airfile from the F20 could be used on the F1 same with aircraft.cfg since the F20 is basically a F1 with a bit of extra weight due to tail hook and wing fold gear.

Rest assured a lot of research was carried out with the limited references available ignoring Wiki there is a set of pilots notes for the F20 in the library along with a profile for the Hornet all Mks which I chose to use.

"One sort of assumes that the model developer will get that sort of thing right from their own research".
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