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Load Analysis Feedback Please

 
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Speedy11(at)aol.com
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PostPosted: Sat Dec 29, 2012 1:11 pm    Post subject: Load Analysis Feedback Please Reply with quote

Matt,
For your Ray Allen trim servos you listed them at 1 amp each. Seems like they would be more like 0.1 amp when in operation (which is not very often). Since they are not used most of the time, I would not include them as part of the load during various phases of flight. By listing them in, say, night IFR with 0.15 amp, you are saying that they will draw 0.15 amp continuously. Or your load analysis is relevant only during that split second in which the trim is being used.
I would say the same is true of your SL-40 and 430W. Seems like the full amps on those are correct only during radio transmissions. The amperage draw is much lower during "rest" periods or during receive only operation.
I doubt you will run the boost pump continuously during start. I run it for about 10-15 seconds then it is off until takeoff. I also don't turn it on during descent until ready for landing.
You have listed your EFISs and radios as being on during start. Personally, I wait until after start to turn on all the avionics except the engine monitor.
I have the pitot heat on only when needed. Maybe you are planning for worst case scenario for loading by listing the pitot heat on during several phases of flight.
The flap motor draws its max amperage only when air loaded. And it is used only for a few seconds during each flight. So, by listing it in your load plan, you are referring only to that particular moment when the flap motor is running and you are transmitting on the radio and you are adjusting the trim setting - a rare occurrence.
There's nothing wrong with planning for that situation - just realize it is for only a few moments of time during a flight.
What I did was to plan the load without the items (such as trim) that are momentary loads. You can also build several load sheets that show the load when trim, flaps, radio are not being used and another for when they are.
My thoughts.
Stan Sutterfield
RV-8A
Reno Race #84

In a message dated 12/29/2012 3:01:27 A.M. Eastern Standard Time, aeroelectric-list(at)matronics.com writes:
Quote:
Would you guys be so kind as to review my Load Analysis worksheet and tell me if
you see anything that looks incorrect or have recommendations to make it better?
I have spent quite a bit of time on this but at the end of the day still
question whether I know what I am doing and would appreciate some peer review...
Thanks.
Of if you would prefer to download the PDF: http://www.mattandmel.com/rv/Master_Load_Analysis_v1.pdf

Thank you much.

Matt


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