Can only find graph for max performance takeoff, PA28 181
Posted by ScriptedChapter@reddit | flying | View on Reddit | 9 comments
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Hello, so I am a student pilot looking to find graphs for flaps up takeoff. But in the POH I can only find a graph for a maximum performance takeoff. But if I were to use this graph with flaps up, then I would perform worse.
So my question is, is there another graph I missed, or a percentage to add to get performance for a flaps up takeoff? PA-28-181.
N546RV@reddit
I'll start by noting that the graph you posted is for a different model and thus not really applicable to you.
I'd expect a -181 to have a reasonably modern POH with full takeoff performance tables. For example, the first Google result for a PA-28-181 POH has the tables you're looking for on pages 74 and 75: https://stpeteair.org/wp-content/uploads/PA-28-181-Archer-II-POH-.pdf
ScriptedChapter@reddit (OP)
Yes sorry I made a typo. The aircraft is a -180.
skunimatrix@reddit
No it is short field. Normal is going to be a flaps up take off with trim tab at or slightly aft of neutral. Also this is from the owners handbook which is not a POH. Assuming 1960's vintage Cherokee the governing document for your airplane and related information is going to come from that airplane's AFM. And that document is specific to that airplane. The AFM for my 180 is not going to work for whatever plane you are flying.
Bad news is that the AFM has none of this information in it.
makgross@reddit
It’s actually unusual for a POH to have specs for anything but short field configuration. Why? If runway length is anywhere near a concern, you should use short field technique.
Archers are in production now and have been for nearly 50 years. It’s a mistake to assume they all have the same POH.
flightist@reddit
That’s clearly Piper’s logic, but in the absence of performance data for a normal takeoff, how do you know where “near a concern” begins?
I’m being moderately facetious here, but I lost a fun discussion item when they started shipping PA44s with normal takeoff accelerate & stop charts.
makgross@reddit
If you have to ask, it’s a concern.
It’s not a terrible idea to always use short field technique.
flightist@reddit
Fun part of being an examiner is being able to press on this point when they turn up with numbers for a normal takeoff but accelerate & stop for a short.
SensualPuma@reddit
I’d familiarize yourself with this: https://www.faa.gov/sites/faa.gov/files/13_phak_ch11.pdf
rFlyingTower@reddit
This is a copy of the original post body for posterity:
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Hello, so I am a student pilot looking to find graphs for flaps up takeoff. But in the POH I can only find a graph for a maximum performance takeoff. But if I were to use this graph with flaps up, then I would perform worse.
So my question is, is there another graph I missed, or a percentage to add to get performance for a flaps up takeoff? PA-28-181.
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