In wave, in blue hole at cloud level, hole closes, in IMC, then what?

On Wednesday, April 8, 2015 at 12:02:26 PM UTC-7, Martin Gregorie wrote:
On Wed, 08 Apr 2015 11:41:01 -0600, Bob Whelan wrote:

In re Bob K.'s and Steve L.'s comments elsewhere on this branch, "Ha ha
ha. Oh the knowing joy of those familiar with 90-degree landing flaps
(and I'm one of 'em)!!!" Regrettably (in subsequently broken
ship/traumatized pilot terms), that particular religious war was lost
long, long ago.

Around 2004 there was another benign spiral thread which caused me to be
a bit of experimenting in an ASW-20. I found that, in calm evening air
trimmed for best glide (57 kts) and zero flap (position 3) and flying
straight, it slowly developed a 25 second phugoid oscillation with an
associated +/- 5kt speed oscillation.

I also tried for a benign spiral: zero flap, wheel down and brakes out,
same trimmed speed and going hands free after setting up a 20-30 degree
bank. After even half a circle the bank angle had increased, the nose had
dropped the speed was increasing. I never let it go beyond that point and
concluded that the ASW-20 doesn't have a benign spiral.

I haven't tried either experiment with the Libelle but should do so this
season, as its always good stuff to know. BTW, my H.201 is s/n 82, so it
dates from before the move to the B series, so it has balsa sandwich
flying surface skins, the small tailplane and upper and lower surface
brakes.


--
martin@ | Martin Gregorie
gregorie. | Essex, UK
org |

Martin,
I have H201 SN 81 and it will do a beautiful benign spiral! I've had "hands off" for 15-20 minutes when descending from altitude.
Love the Libelle!
Jay

On Thu, 09 Apr 2015 07:27:44 -0700, JayM wrote:

I have H201 SN 81 and it will do a beautiful benign spiral! I've had
"hands off" for 15-20 minutes when descending from altitude.
Love the Libelle!

Thanks for the info. I'll definitely check that out next time I fly.

Curiosity: my Libelle was one of two that the GSA (UK forces soaring
association) bought in early 1970. The other one went to the 1970 World
Champs at Marfa. Is that your Libelle? What trim setting do you prefer
for a benign spiral?


--
martin@ | Martin Gregorie
gregorie. | Essex, UK
org |

On Friday, April 10, 2015 at 5:11:12 AM UTC-7, Martin Gregorie wrote:
On Thu, 09 Apr 2015 07:27:44 -0700, JayM wrote:

I have H201 SN 81 and it will do a beautiful benign spiral! I've had
"hands off" for 15-20 minutes when descending from altitude.
Love the Libelle!

Thanks for the info. I'll definitely check that out next time I fly.

Curiosity: my Libelle was one of two that the GSA (UK forces soaring
association) bought in early 1970. The other one went to the 1970 World
Champs at Marfa. Is that your Libelle? What trim setting do you prefer
for a benign spiral?


--
martin@ | Martin Gregorie
gregorie. | Essex, UK
org |

No, Mine was never in any National or higher competition according to the logbooks. I trim for 50kts, pull full dive brakes and take hands off the stick, feet off the rudders.
Jay

On Sat, 11 Apr 2015 08:01:45 -0700, JayM wrote:

No, Mine was never in any National or higher competition according to
the logbooks. I trim for 50kts, pull full dive brakes and take hands
off the stick, feet off the rudders.
Jay

OK, thanks.

Just now I looked up G-INFO, the UK database and found that S/N 83 is
also in the UK, so that's probably the other one the RAFGSA bought with
mine, but there's not enough detail to be sure.

You may be interested to know that S/N 3 is still registered and
presumably still flying.


--
martin@ | Martin Gregorie
gregorie. | Essex, UK
org |