Duke B60 POH vs BS manual - engine start procedure
-
Hi,
While going trough Duke 60 POH (available at http://dukeflyers.org/DFA-11/docs.php), I can see, that the engine start procedures are very different.
For example, cold start in POH starts:
- Throttle 1000 rpm (1/2 inch open)
- Mixture control FULL FORWARD 2-3 seconds to prime then to IDLE CUT-OFF
- Magneto/Start - START
- When the engine starts, return he Magneto/Start switch to BOTH. Slowly advance the mixture control to FULL RICH.
at the same time, BS manual says for cold starts:
- Mixture full rich, throttle full open.
- Boost pump for 5-8s
- Throttle 1/2 inch
- Starter - Engage
Similar story for hot starts, POH says nothing about prime or fuel, while BS manual asks for 10-20s with throttle closed and then 2-3s with throttle open.
Also for flooded start, POH asks for mixture idle cutoff, BS manual says mixture "lean".
I can get that IRL POH (linked) is for BE 60 & 60A and BS one is 60B, but the engines should be same (TIO-541-E1C4 in POH and simply TIO-541 in BS manual)
Why there are such differences in real POH and BS manuals regarding engine starting procedures?
Best regards,
-
It's a combination of a number of factors. There are some technical limitations on the MSFS side, which affect mostly the starting mixture position. As for flooded and hot starting procedures, I designed the reciprocating engine simulation around my personal experience with fuel injected Lycoming engines, and adapted this simulation with the help of real world Duke owners to match their aircraft. Lastly, I reduced the rate at which some things happen in the simulation (such as priming via the fuel pumps), based on user experiences with my previous aircraft. I found that the overwhelming majority of users were flooding the engine by becoming distracted with checklists while priming the aircraft for just a few seconds. By decreasing the priming rate in the Duke, I found that almost no one had this problem. I hope that answers some of your questions. I appreciate your attention to detail, as that's what my airplanes were built for!
-
@Black-Square Interesting info - I have noticed the priming rate being very slow as well since the Dukes released. Would it be possible to maybe have an option in the tablet in the future for "Realistic priming rate" on or off, sitting there with the other on/off options on the first page? Perhaps it can default the way you have it, or hardcore users can turn that on to get the fast IRL prime rate.
Just a thought!
Dan
-
Hi!
Thanks very much for a reply.
I can understand the sim limitations, but in the other hand, we shall thrive for "as real as it gets" with such an aircraft as BS series in general. The worry that someone will have "hard time" starting the over primed engine is a "learning curve", for that we have a "flooded start" checklist :).
There are like 101 other "stupid" things in the sim, like turning the fuel valves to OFF instead of crossfeed position during the pre-flight checks, due to the position (accessibility) of the switches in the sim, as an example.
I guess it is a line in engines or systems.cfg that regulates that?
Best Regards
-
@Ipf5ZDco16 I would guess the priming rate is part of the special engine simulation code and is probably not something that we can modify as end users.
