Today's Message Index:
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1. 01:23 AM - Re: Kolb FireFly at High Altitude (JC Gilpin)
2. 05:27 AM - Re: Firefly at High Altitude (Thom Riddle)
3. 06:36 AM - Re: Firefly at High Altitude (Thom Riddle)
4. 03:11 PM - Beauford's Firefly (George Alexander)
Message 1
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| Subject: | Re: Kolb FireFly at High Altitude |
I flew my 40hp FireFly off 7000+ft strips a couple of times, no problem.
And many times climbed to 10,000ft, no problem, still climbing at 200fpm.
And that's without re-jetting for that altitude, so EGTs were down around
800F.....
I weigh 165lb. This wasn't on really hot days, but not brisk either. You
really do need to heed the change in density altitude with increasing
temp.....
Longer wing FireStar would definitely be better. The real shortcoming of
the FireFly is that too short 22ft wing.....
JG
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| Subject: | Re: Firefly at High Altitude |
I have a spreadsheet that was written by some aeronautical engineer and published
either on EAA's website or CAFE website (can't remember after so many years)
that predicts performance of a light aircraft when plugging in specific physical
attributes of the airplane.
I plugged in the known values for the 40 hp Rotax powered Firefly and this spreadsheet
predicts a service ceiling(where climb degrades to 100 fpm) of about 12,010'
density altitude at gross wt of 550 lb. These numbers seem reasonable to
me.
As Beauford said, the longer wing Firestar, though a bit heavier, should have
a bit higher ceiling. With same engine and an extra 100 lb of airframe the spreadsheet
predicts a service ceiling of about 13,300' DA. Having owned a 35 hp
Firestar and also a 40 hp Firestar, these figures seem reasonable too, though
I never flew either Firestar over about 8,000' DA.
--------
Thom Riddle
Buffalo, NY (9G0)
Don't worry about old age... it doesn't last very long.
- Anonymous
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=409984#409984
Message 3
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| Subject: | Re: Firefly at High Altitude |
In case anyone is interested in the spreadsheet I mentioned in my previous post,
here is a link to it on Google Docs. You should be able to down load it and
modify it for your own use.
https://docs.google.com/spreadsheet/ccc?key=0Ap6b4DzV2dGZdGVsWGxrdHJFRzBfT3V1N0dLWGp3N0E&usp=sharing
The YELLOW fields are for the user to fill in. The BLUE fields are calculated estimates
for various parameters. The numbers in the spreadsheet now are for the
40 hp Firestar I used to fly.
--------
Thom Riddle
Buffalo, NY (9G0)
Don't worry about old age... it doesn't last very long.
- Anonymous
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=409988#409988
Message 4
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| Subject: | Beauford's Firefly |
Not nearly the quality of other videos being posted.... but not bad for a smart
phone held by a not-so-smart operator.
http://youtu.be/-NmaN9yLuOQ
--------
George Alexander
FS II R503 N709FS
http://www.oh2fly.net
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=410021#410021
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