<p>@Revientor , Yes temps were a factor, I have seen failed start1 on perfect weather day and second flight of day. The system was so unreliable. We had numerous grd aborts for that reason. Have had my share of hand pumping JFS/Brake Accumulators and can say it is no fun and quite the workout. It took three people to pump the required 400 strokes to get them back to full charge. We asked god support to put a Hydraulic Mule on the back of a truck and follow the starts so as if one failed we just hooked up the hoses and charged the system then reserved the reservoir, much faster. Got some funny looks from the pilots at first, but they grew to understand. The new digital controllers really fixed the failure rate. Just a little history from my experiences.</p>
Best posts made by gwes25
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RE: Start 1 & Start 2: why 2 possibilities instead of one?
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RE: Start 1 & Start 2: why 2 possibilities instead of one?
<p>In the beginning of the life of the falcon, the thought was if start 1 failed, then you had a second attempt readily available. The issue became that start 1 failed 60% of the time. a study was done at Hill AFB and found that start 2 (uses both Hydraulic accumulators to turn the hydraulic start motor) then start failures dropped to about 20%, The weak link became the JFS Controller, which is another story for another day. Hope this helped.</p>
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RE: Start 1 & Start 2: why 2 possibilities instead of one?
<p>@Aragorn , Shorter strokes?!</p>
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RE: Small EOY update...
Thanks for all you for giving us this great Sim. Everything you do is appreciated. Have a great holiday season!!!
Latest posts made by gwes25
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RE: Small EOY update...
Thanks for all you for giving us this great Sim. Everything you do is appreciated. Have a great holiday season!!!
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RE: Start 1 & Start 2: why 2 possibilities instead of one?
<p>@Aragorn , Shorter strokes?!</p>
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RE: Start 1 & Start 2: why 2 possibilities instead of one?
<p>@Revientor , Yes temps were a factor, I have seen failed start1 on perfect weather day and second flight of day. The system was so unreliable. We had numerous grd aborts for that reason. Have had my share of hand pumping JFS/Brake Accumulators and can say it is no fun and quite the workout. It took three people to pump the required 400 strokes to get them back to full charge. We asked god support to put a Hydraulic Mule on the back of a truck and follow the starts so as if one failed we just hooked up the hoses and charged the system then reserved the reservoir, much faster. Got some funny looks from the pilots at first, but they grew to understand. The new digital controllers really fixed the failure rate. Just a little history from my experiences.</p>
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RE: Start 1 & Start 2: why 2 possibilities instead of one?
<p>In the beginning of the life of the falcon, the thought was if start 1 failed, then you had a second attempt readily available. The issue became that start 1 failed 60% of the time. a study was done at Hill AFB and found that start 2 (uses both Hydraulic accumulators to turn the hydraulic start motor) then start failures dropped to about 20%, The weak link became the JFS Controller, which is another story for another day. Hope this helped.</p>
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RE: Quick update from the frontlines, 4.36
<p>Thanks for the update!</p>
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RE: 2021 A Falcon BMS Year to remember!
Great post Max! Thank you to all the team members and may all have a Happy and Prosperous New Year!!!
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RE: Update on 4.35 U2
Thank you for ll you have done and continue to do for us, the BMSers. Without you this would be a “remember BMS Falcon and how involved it was to run a campaign.”. you deserve nothing less than our complete gratitude for what all of you do for this Sim in your “spare time”. What is spare time?. I never had it when I worked and raised kids. again, Thank you!
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RE: Jet fuel starter (JFS) turning off too soon
The JFS Does have a fuel s/o valve located in the rt flaperon ISA compartment that gets a signal from the JFS controller. The JFS does have a time limit on ground to avoid overheat. it does not have a limit in air, it can run continuously till fuel runs out or meltdown, which ever comes first. When system was using the old analog controllers(80’searly90’s), failures were quite frequent. The controller would fail as soon as a parameter was exceeded even for a millisecond. The new digital controllers were a godsend, they allowed a momentary exceedance of parameters as long as it stabilized within parameters after exceedance and start would continue. We would have the Hyd mule standing by for pressurizing B sys accumulators instead of hand pumping.