Flap speeds

**cdeerinck** · #1 June 10th 20, 01:46 AM posted to rec.aviation.soaring

Can anyone tell me if recommended Flap Speeds, as they appear in flight manuals, are Indicated (IAS) or true (TAS)?

I would assume indicated, otherwise a speed ring wouldn't be helpful, but I don't like to assume.

**Dave Nadler** · #2 June 10th 20, 02:00 AM posted to rec.aviation.soaring

On Tuesday, June 9, 2020 at 8:46:21 PM UTC-4, cdeerinck wrote:
Can anyone tell me if recommended Flap Speeds, as they appear
in flight manuals, are Indicated (IAS) or true (TAS)?

I would assume indicated, otherwise a speed ring wouldn't be helpful,
but I don't like to assume.

Always indicated. As your polar.

**jfitch** · #3 June 10th 20, 02:28 AM posted to rec.aviation.soaring

On Tuesday, June 9, 2020 at 5:46:21 PM UTC-7, cdeerinck wrote:
Can anyone tell me if recommended Flap Speeds, as they appear in flight manuals, are Indicated (IAS) or true (TAS)?

I would assume indicated, otherwise a speed ring wouldn't be helpful, but I don't like to assume.

The airplane only knows IAS. TAS means nothing to it (exception is flutter).

**cdeerinck** · #4 June 10th 20, 03:57 AM posted to rec.aviation.soaring

Thank you very much, gentlemen.

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