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matronics(at)rtist.nl
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 Posted: Thu Oct 04, 2007 1:08 pm Post subject: Propeller selection |
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OK, so I started reading the newer manuals from Jabiru. They really confuse me, as many things I have learned in the past about my engine is different now?!?
First is head temperatures. I was always told to keep them under 175 Celsius peak, and unde 150 continuous. Now I read in the latest installation manual on page 7 that continuous 180 Celsius is OK, and 200 peak is not a problem? Huh?
Next is propeller choise. I was told that Jabiru engines couldn't swing a large prop and most of us use 58" - 64" props. Now the manual tells me on page 28 that you can use a 70" propeller? And even with that prop you should be able to run 3300 rpm? Doesn't that make the tips break the sound barrier?
This really makes me wonder, can I trust these manuals at all? I now have three different revisions, and they all show me different information. How do I find out what the 'real truth' is???
Rob
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jetboy
Joined: 22 Jul 2006
Posts: 233
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| Posted: Fri Oct 05, 2007 12:18 am Post subject: Re: Propeller selection |
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Rob,
The temperature limits changed with the revisions to the cyl. heads, so the new manual does not correctly reflect the conditions for an old engine.
Your observation is correct, a lot is confusing, better to trust your own judgement and dealer support. Bear in mind the manual is not written in English, just printed that way, and may require some translation to get the job done.
Props for the 2200 are listed in the installation manual as up to 68" with pitch of between 30" and 48" and a moment of inertia spec that needs to be met.
Glad you brought the subject up, I just ordered a 64' x 30" prop without realising that to do my first choice 64" x 28" would have been out of limits. I decided on the 64" x 30" because someone has already done that prop on same airframe with good results.
Dont worry about exceeding any mach numbers on prop or airframe I assure you that wont happen any time soon. Its rare to get more than 3100 rpm for most of us.
I think the 70" prop is only for the 8 cyl. engines which run a bit lower rpm.
Ralph
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Ralph - CH701 / 2200a |
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Gilles.Thesee(at)ac-greno
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| Posted: Fri Oct 05, 2007 1:03 am Post subject: Propeller selection |
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jetboy a écrit :
| Quote: | Bear in mind the manual is not written in English
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Ralph,
I would have sworn it was English !
What do you mean ?
Best regards,
--
Gilles
http://contrails.free.fr
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matronics(at)rtist.nl
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| Posted: Fri Oct 05, 2007 1:06 am Post subject: Propeller selection |
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Hi Ralph,
Thanks for the comments. Your observations about the old vs. new heads makes
sense, and I'll happily use the lower temperatures as a guideline. I just
find it confusing that a few days ago I was looking for some information on
oil pressure and I was referred to newer manuals that do apply to my engine
serial number, and now I find information in those newer manuals that yet
again contradicts what I thought I knew.
Unfortunately my Jabiru dealer (LimAir in Belgium) seems to have vanished
from the face of the earth, and I have never received any pro-active support
from them. So I will have to rely on the common knowledge in this group.
As for the prop, you mention no-one getting more than 3100 rpm. Well, I had
my prop specifically calculated and manufactured to get 3300 rpm, and in
doing so I got a 63" x 44" prop. If I would have known that lower peak rpm
is common then I would have opted for a larger, more efficient prop. I may
have to do that anyway, as I now get exactly 3300 rpm static, and I can't go
WOT on cruise without going over 3300 rpm.
As for semi-English manuals, I don't care. I'm Dutch so English is only a
second language to me anyway. Anything that vaguely resembles English will
do fine 
Rob
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Peter H
Joined: 20 Mar 2007
Posts: 197
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| Posted: Fri Oct 05, 2007 1:22 pm Post subject: Propeller selection |
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Ralph
I am curious why do you say that the manual is not written first in English?
The rest of your post is helpful.
Cheers
Peter H
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johnl(at)loram.org
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marin
Joined: 06 Mar 2007
Posts: 16
Location: Stanwood WA
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| Posted: Sat Oct 06, 2007 9:35 am Post subject: Propeller selection |
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Ron
Thanks for the info I am building a Bushcaddy E-LSA in Silvana WA and hope
to here how it goes for you. I travel to the peninsula about once a month
and if you do not mind I would like to stop by.
Marin Streeter
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ranchlaseigneurie(at)hotm
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| Posted: Sun Oct 07, 2007 5:34 pm Post subject: Propeller selection |
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Hello
does the Video include installation of props on the 5100 cc Jabiru engine
regard
gilles
Express yourself with free Messenger emoticons. Get them today! [quote][b]
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