[rebel-ramble] Weights and performance

[Garry Wright]

My experience today in FOKM is not a lot different. We were high and hot
but about 100# under gross. At 8500" and 16C the climb rate would not be
considered stellar though I did not actually note it - probably not too
different from your measurement. Thats with a 150 HP O320. At full gross
you want to have some time to get altitude on up there. Its not a
problem but must be unusual for folks not used to the mountains. I know
that I am always astonished at how FOKM climbs at sea level. You don't
get that around here. Hot, high and heavy is something that has come
close to biting everyone around here somewhere in their flying
experience. A bit like glassy water - I should know.

Garry

Ken wrote:

Speaking of the West...
What climb rate is reasonable at 9000 feet?

We did a 50 nm "ballistic" leg this morning and got to 9500 feet before
having to descend. At 9,000 and 13*C the climb rate was down to about
400 fpm at 70 KIAS even though we were at least 200 lb under gross with
little luggage and half fuel.

Ken


Bob Patterson wrote:

Hi Garry !

Thanks ! No worries about mogas when there's lots of
Western Hospitality !! :-) Ramblers are always pleasantly surprised
at how helpful people are, all over this great country ! I really
wish we could get more folks from Quebec & Eastern Canada
to join us .... (Some of them have 912 Rebels, and we already
have TWO of those coming !)

snip

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[Bob Patterson]

Hi Ken !

Gee, 400 fpm at 9,500 sounds pretty good ! You don't have
to worry about C-150's or C-172's passing you !!! ;-) :-)

Seriously, sounds like you'll be fine - 9,500 is about as high as we
ever go .... mostly we're at 8,500 going west, although even 6,500
is enough to get through the passes.

Interesting that you were doing a ballistic run - great way to
set up the factors in a GPS (like the AvMap ...) so it can calculate
your ETE & fuel consumption. We do a fair bit of that kind of
flying - since we are up high, we convert the altitude to speed
when we get several miles from destination. Often set up a
descent of 200 - 300 fpm, maybe 30 miles out, and power back
just a bit. NOT good to chop the power & dive, as cracked
cylinders result !! The gentle descent increases our speed
by 10 - 15 mph, and keeping most of the power on keeps the
engine warm, and avoids the leaning that results from speed
windmilling the engine at higher rpm than the throttle
setting would normally support. This comes from final glide
practice in gliders .... but, of course, is standard procedure
for airline drivers. ;-)

We also take advantage of thermal lift enroute - by
pulling up in lift, and pushing over in sink, we can increase
average cross country speeds by about 10 mph fairly easily.

And sometimes ridge or wave lift ...... but that's another
story ! :-) Wave can give 2,000 fpm lift, even throttle closed,
and verrrry smooth air --- not toooo likely we'll get to try
that though .....

--
......bobp
http://www.prosumers.ca
http://bpatterson.qhealthbeauty.com
http://apatterson2.qhealthzone.com

-------------------------------orig.-------------------------
On Sunday 10 June 2007 19:29, Ken wrote:

Speaking of the West...
What climb rate is reasonable at 9000 feet?

We did a 50 nm "ballistic" leg this morning and got to 9500 feet before
having to descend. At 9,000 and 13*C the climb rate was down to about
400 fpm at 70 KIAS even though we were at least 200 lb under gross with
little luggage and half fuel.

Ken

Bob Patterson wrote:

Hi Garry !

Thanks ! No worries about mogas when there's lots of
Western Hospitality !! :-) Ramblers are always pleasantly surprised
at how helpful people are, all over this great country ! I really
wish we could get more folks from Quebec & Eastern Canada
to join us .... (Some of them have 912 Rebels, and we already
have TWO of those coming !)

snip

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