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DAquaNut(at)aol.com
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 Posted: Sun Jun 03, 2007 12:10 pm Post subject: 447 Thrust |
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DAquaNut(at)aol.com
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| Posted: Sun Jun 03, 2007 12:21 pm Post subject: 447 thrust |
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Group,
I finally got around to flying the firefly Fri. evening after doing a decarbon. She fired right up and seems to idle a little smoother but I ran out of time. I had to reset the Ivo to 6250 static as she was almost making 6800 rpm in level flight. How do I verify the 447 is making full HP. I had the prop off, so even though I have adjusted the pitch to obtain 6250 rpm ,I do not know if the pitch is the same as it was before,so I dont know for sure I f it is putting out full power. How do I go about doing this check?
Ed Diebel FF #62
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The BaronVonEvil
Joined: 23 Jun 2006
Posts: 76
Location: Walla Walla, WA.
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| Posted: Sun Jun 03, 2007 1:45 pm Post subject: Re: 447 Thrust |
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Hi Ed,
Did you check the pitch of the prop prior to adjusting it ? Do you know if you had to increase or decrease the pitch after the decarb? This in itself would give you an idea what is going on with your engine.
I believe the max rpm for a 447 (depending on model) is 6800rpm. If you are hitting that in level flight I would say you are about pitched right for cruise.
Do you recall what any of the engine temps were prior to decarb? If everything else is the same, than cooler running temps would indicate an engine that isnt having to work as hard to make the same power.
I hope this helps
Best Regards
Carlos G.
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rlaird
Joined: 10 Jan 2006
Posts: 373
Location: Houston
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John Hauck
Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
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| Posted: Sun Jun 03, 2007 3:56 pm Post subject: 447 Thrust |
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| I believe the max rpm for a 447 (depending on model) is 6800rpm. If
you are hitting that in level flight I would say you are about pitched
right for cruise.
| Carlos G.
Carlos:
Was wondering if max continuous rpm would be better to prop a fixed
pitch prop??? That would be more in the order of 6,500 rpm.
Most all the Rotax two strokes have the same limits:
6,500 rpm max continuous
6,800 rpm max power for 5 minutes
The exception may be the 618 and the old 532. Have not taken the time
to check the manuals on the Kodiak web site.
john h
mkIII
DO NOT ARCHIVE
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John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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Richard Pike
Joined: 09 Jan 2006
Posts: 1671
Location: Blountville, Tennessee
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| Posted: Sun Jun 03, 2007 5:18 pm Post subject: 447 Thrust |
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No, you are right on. If you prop the 532 for 6,800 max, the egt's tend to
run way too high at cruise. I propped my 532 for 6,400 max because if I
took any pitch out for more than that, the egt's got weird. 6,500 would have
given a slightly better climb, but 6,400 gave me very stable egt's.
Richard Pike
MKIII N420P (420ldPoops)
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Richard Pike
Kolb MKIII N420P (420ldPoops)
Kingsport, TN 3TN0
Forgiving is tough, being forgiven is wonderful, and God's grace really is amazing. |
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