Today's Message Index:
----------------------
1. 12:21 AM - Matronics Email List Fund Raiser During November! (dralle@matronics.com)
2. 02:32 AM - Re: setting prop pitch (David Joyce)
3. 03:33 AM - Re: Changing Coolant (Carlos Trigo)
4. 05:49 AM - Re: setting prop pitch (Dave Austin)
5. 07:38 AM - Re: setting prop pitch (benburb)
6. 09:05 AM - Re: setting prop pitch (Roger Lee)
7. 09:12 AM - Re: Changing Coolant (Roger Lee)
8. 07:12 PM - Re: setting prop pitch (benburb)
9. 09:14 PM - Re: setting prop pitch (Roger Lee)
Message 1
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| Subject: | Matronics Email List Fund Raiser During November! |
Dear Listers,
Each November I hold a PBS-like fund raiser to support the continued operation
and upgrade of the List services at Matronics. It's through soley through the
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During the month of November I will be sending out List messages every few days
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and understanding during the Fund Raiser and throughout these regular messages.
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These are extremely generous guys and I encourage you to visit their respective
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You can make your List Contribution using any one of three secure methods this
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Thank you for your support!
Matt Dralle
Matronics Email List Administrator
Message 2
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| Subject: | Re: setting prop pitch |
Ben, For VP/CS props the PFA recommended a max static fine pitch figure of
5650, which also works pretty well for the go around situation when you slam
on full throttle from approach configuration at 60 knots. If you are talking
about a fixed pitch prop then I guess other considerations will come in and
you may want to compromise some take off performance for better cruise
performance.
Regards, David Joyce, G-XSDJ
----- Original Message -----
From: "Ben Burbridge" <benburb@comcast.net>
Sent: Saturday, November 01, 2008 2:56 AM
Subject: RotaxEngines-List: setting prop pitch
> <benburb@comcast.net>
>
> I have a 912UL with a two-blade Warp Drive prop, and am not getting static
> rpm of 5,200. I am about to re-set the pitch, and can't remember the
> recommended degrees of pitch. Does anybody know? Thanks. Ben
>
>
>
Message 3
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| Subject: | Changing Coolant |
I am far from being an expert in cooling, and also about EVANS+, but I do
know that Evans itself, every time you buy a bottle, gives you a sticker to
be put in your coolant cap that says:
NEVER ADD WATER!!
Further, engine manufacturers that I am aware of (car engine conversions),
do recommend :
When you change your coolant from water or water/antifreeze mix to Evans, or
backwards, you MUST thoroughly flush your cooling system!
That's what I have been told
Carlos
> -----Original Message-----
>
<Gilles.Thesee@ac-grenoble.fr>
>
> Michael,
>
> There is no real need to flush the cooling system after using Evans +.
> It is mainly propylene glycol, which mixes nicely with water. By the
> way, there is no problem with adding water to Evans+. What happens is
> just that any amount of water will tend to lower the advertised higher
> boiling point of pure Evans.
> Ordinary 50/50 mix contains ethylene glycol. No problem with traces of
> Evans in 50/50 .
>
Message 4
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| Subject: | Re: setting prop pitch |
Ben,
A static pitch of 5200 rpm will give you great climb but very poor cruise.
Unless you are flying from a short strip I'd suggest 4800 static.
Dave Austin 601HDS - 912
Message 5
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| Subject: | Re: setting prop pitch |
Guys- thanks for all the responses. Seems we have many opinions. I haven't changed
my setting for 13 years (912UL and 2-blade Warp Drive) I have always gotten
about 4800 max rpm WOT, straight and level. I get great climb rates on my
Kitfox III. I got to thinking that 4800 meant I wasn't getting all 80hp I paid
for. Suggestions ranged from 4800 to 5,650 max static. Looks like it my not
be a critical issue. Ben
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=211466#211466
Message 6
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| Subject: | Re: setting prop pitch |
Ben,
Rotax designed the 912's to run optimally between certain rpms for several reasons
(4800-5200 for best torque, 5000 peak). Cruise should usually be around 5000
give or take a hundred rpm depending on your plane. Some like to cruise at
even higher rpms, 5500 is max continuous , but not preferable. Running your engine
to get only 4800 at WOT is lugging your engine too far down and in fact over
time won't be good for it. Rotax jumped on a few Mfgs. for running the engine
at 5100 WOT or lower. Rotax classes teach setting the max rpm for 5500 WOT
unless you have a need for special performance. On my plane 4950 rpm on takeoff
puts me right at 5500 rpm flat and level full throttle. Using the ground adjustable
prop is a compromise between several flight characteristics.
You are loosing "tremendous" flight performance from your plane with a WOT set
at 4800 flat and level. Try 5500 WOT flat and level. Then get back here and tell
us your experience. If it is like most people you will think you have a new
turbo charged engine.
I guarantee it.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Service Center
520-574-1080
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=211482#211482
Message 7
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| Subject: | Re: Changing Coolant |
Evans can mix with water, but then you don't have Evans any longer just a plain
diluted anti freeze at what ever concentration of the water mix ratio you added.
The whole idea behind Evans was to eliminate the water. This for the most
part got rid of the water boiling point / boil over issue. Once you put water
in Evans and you add more and more water the Boiling point starts to drop. Give
or take a few degrees and "generally" speaking a 50/50 mix boils at around 270F
and by removing all the water and just keeping the base anti freeze the boiling
point goes up to about 370F, but pure anti freeze does not absorb and transfer
heat as well as pure water.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Service Center
520-574-1080
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=211557#211557
Message 8
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| Subject: | Re: setting prop pitch |
Roger- thanks for the input. I'm excited about the prospect of feeling like I have
a turbo-charged engine- especially after 13 years at 4800.
I am a little puzzled though when you said you run 5500 WOT and recommend the same
for me, yet you said "Some like to cruise at even higher rpms, 5500 is max
continuous , but not preferable." If it's not preferable... Ben
--------
Kitfox III/IV. Rotax 912UL. Warp Drive 2 blade. On and off Aerocet amphibs.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=211704#211704
Message 9
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| Subject: | Re: setting prop pitch |
Ben,
My prop is set to achieve 5500 WOT flat and level at the altitude range I usually
fly. I cruise at 5000-5100. Rotax does recommend a little higher rpms if you
burn 100LL all the time. Run 5200-5350. This will help some on the lead build
up and use a fuel additive like Decalin if you use 100LL..
Set the prop to 5500 WOT flat and level, but that is not where you cruise. When
the prop is set to 5500 you benefit from the prop pitch during other times such
as in takeoff with better climb performance, lower throttle setting for cruise
means a little better fuel economy. If it is set for 5500 and lets say you
bounce up off the runway and you go "oh no I'm going to drop it in", then when
you give it full throttle trying to save yourself the engine will spin up faster
to save you, compared to, if you had too big a bite of air with the prop
and it had to struggle to spin up. If the prop is pitched too much you will need
to give it more throttle/fuel to achieve your cruise speed. When it is set
for 5500 you will be able to pull back on the throttle/less fuel and still cruise
at the speed you want. You will have a higher top end speed, too.
Mind you we are comparing 5500 to your 4800 here. A 700 rpm gain will make a big
difference.
I know some that cruise at 5500 WOT just to cruise. This will cause extra wear
over time. My question is why? Do you need to get somewhere a few miles per hour
faster all the time? Why wear and tear any extra on the engine than need be.
We want it to be reliable for its 1500 hours and more.
Try it, I know you will be happier.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Service Center
520-574-1080
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=211716#211716
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