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rv9jim(at)juno.com
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 Posted: Wed Sep 20, 2006 9:22 am Post subject: tuning static port? |
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Hi Ron
I had a mono wheel also but I put my pitot and static above the
tail. In effect, what you have below the wing was above the rudder on my
bird.. Why are you considering the issue of tuning the static? The
factory provided unit works great. It is only if you have problems that
you need to consider "tuning". The O-Ring provides a different boundary
layer to obtain the static pressure change. It is rarely needed. Any
o-ring will do and IF and when you need to go that route, you can use
any epoxy or even super glue to keep it in position. I would then paint
the o-ring so it would not deteriate. Rubber will be effected by ozone.
Jim Nelson
(PS. I had 4 holes, one in each quadrant- 3-6-9-12 o'clock. that way
it always had the best static in case one got plugged)
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rv9jim(at)juno.com
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frank.hinde(at)hp.com
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rv9jim(at)juno.com
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| Posted: Wed Sep 20, 2006 11:34 am Post subject: tuning static port? |
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Hi Frank,
Its a Lycosorus (SP) not a Rotax. I hope to be able to blend 92
mogas with the regular 100LL after I have around 75 hours or so.
Jim
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sales(at)6440autoparts.co
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| Posted: Wed Sep 20, 2006 11:43 am Post subject: tuning static port? |
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I quess 8.70:1 in a fuel injected engine is pushing the limits
then.
Randy
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frank.hinde(at)hp.com
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| Posted: Wed Sep 20, 2006 12:08 pm Post subject: tuning static port? |
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It should be happy on pure 92 oct Mogas. According to GAMI they
recommend 25 to 50F LOP or 150ROP up to 75% power and CHTs of 350F or
lower.
On my 7a I am still above the required CHT but only have 12 hours on it,
so I'm hopeful.
Apparently all Lycs (within the last 20 years) have the hardened ex
valve seats required to withstand unleaded gas.
According to Superior, mogas just "wasn't an issue" on the test
stand...i would still like to find what regime they ran to say
that...I.e what mixtures they ran at what CHT/
Cheers
Frank
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frank.hinde(at)hp.com
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| Posted: Wed Sep 20, 2006 12:15 pm Post subject: tuning static port? |
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Depends...Its a combination of CHT, octane, CR, ignition timing and
mixture.
If you can get your CHT's down a bit further or run a bit richer then
8.7 will be OK...The question is ...How much richer and how much lower
the CHT's need to be?
My guess is not much, and maybe you want to stick to 25 deg max advance
but the truth is I don't know for sure.
FI actually helps, you can balance your individual fuel flows to each
cylinder much more accuratly, this allows LOP operations which is a
significant fuel saving over a carbed motor which generally cannot be
run LOP due to poor fuel distribution.
I tried LOP the other evening for the first time...sure, speed dropped
but oh my the fule flow fell off the edge.
I was doing 180kts Indicated at 100F ROP, 12.3 GPH...pulled back the mix
to average 50F LOP and speed dropped to 137kts but fule flow dropped to
like 6.7GPH...Pretty impressive!
Frank
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rparigor(at)SUFFOLK.LIB.N
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| Posted: Wed Sep 20, 2006 9:08 pm Post subject: tuning static port? |
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Hello Jim
Thx. for the info on static tube. Why did you put your pitot / static on
top of rudder instead of below wing?
I think the reason there are 4 holes on bullet is to net out to static
pressure if not going direct into wind. If lets say slipping to left, the
9 would be high and the 3 would be low, netting to static. Same goes for
climbing.
"How far along are you on your build?"
Started build 06-2003. Getting close to bonding on top, wings complete
except top skins not bonded on, undercarriage in. Panel is populated but
not wired, figure a few more years to go, not including build of long
wings.
Spent better part of a year setting straight unacceptable supplied
components.
N4211W XS Mono/914/Airmaster
Ron Parigoris
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FLYaDIVE(at)aol.com
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| Posted: Thu Sep 21, 2006 4:26 am Post subject: tuning static port? |
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In a message dated 9/20/06 3:04:56 PM Eastern Daylight Time,
frank.hinde(at)hp.com writes:
| Quote: | Why?...Is it certified?.....Turbocharged? High CR?...If you can get your
CHT's under 350F in normal cruise and a CR of 8.5:1 or lower I can't see
it would require 100LL?
Why is correct ... They do make 93 & 94 octane MoGas and that works well in
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the HC range.
Barry
"Chop'd Liver"
"Show them the first time, correct them the second time, kick them the third
time."
Yamashiada
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