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Airmaster Prop

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astills(at)cox.net
Guest

Posted: Mon Jan 08, 2007 7:52 am Post subject: Airmaster Prop

I'm getting ready to place my Airmaster Prop on my Jabiru engine as the

temps have settled down during brake in and need to know if anyone has any

information

about where the prop should be installed in relation to the engine TDC. The

airmaster manuel doesn't say and neither does Jabiru. I would think the #1

blade should

be st at #1 cylinder at TDC but am not sure. Anyone with experience would

help.



Al Stills

N625AZ

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brian.lonnon(at)tiscali.c
Guest

Posted: Mon Jan 08, 2007 9:23 am Post subject: Airmaster Prop

Hi Al,



I saw this message. We have recently bought a Europa XS trigear with Jabiru

330 engine and Warp drive ground adjustable prop.

It has some fancy ducting to pass air over the cylinders

It has done only 60 hrs since new. On the ground, the rear 4 cylinders

rapidly climb to the max of 175 degrees C so unless you are at a very quiet

aerodrome and don't ever have to wait for departure, the engine overheats.



It seems that the main reason for this is that the front nacelles don't

really get any air from the prop because of the size of the spinner and

blade roots. As our prop uses the same blades as the Airmaster, I wonder if

you will get sufficient cooling.



What prop do you use at the moment?



Thanks



Brian



G-BYFG



---

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astills(at)cox.net
Guest

Posted: Mon Jan 08, 2007 10:06 am Post subject: Airmaster Prop

Brian,

I have had the Arimaster installed during the summer here in the desert and

could not keep cool on the ground so I changed to the wood Jabiru prop for

brake in. 60x48. Keeps cool with that prop. The engine has settled in now

and am changing back to Airmaster. I should be able to keep cool on the

ground during winter temps. Yes the blade roots are way out on the Airmaster

(8" from center) but there are Jabiru's flying with them. Just have to limit

gound travel when

possible. The ram air ducts come with the Jabiru engine and have to be

tweeked to get the air right in them. I had to baffel the front of the

intake up onto

the front cylinders a small amount and put a dam (Approx 3/4") in the top of

one between #4 & 6 to get the air moving right. Also had to dam the very

back of the

duct up as too much air was then moving over the rear of the cylinders. They

are pretty much even in CHT's now and settling down very well. I have 19 hrs

on the

engine so far and CHT's are settling to approx 325 Deg's F in cruise. I 'm

at about a max of 295 during taxi and in the low 370's on climb out. I have

no doubt the

Airmaster will work, just have to baby it on the ground. It remains to be

seen what will happen during the hot summers here in Arizona

Just a note...in running my airmaster during the summer, after I tweeked the

baffeling, I was able to cool down while sitting at idle.

Hope this helps

Al Stills

N625AZ

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ptag.dev(at)tiscali.co.uk
Guest

Posted: Mon Jan 08, 2007 11:16 am Post subject: Airmaster Prop

Hi! Alan

Somewhere I posted a message from MT Propellers on this positioning

issue. If you do a search you should find it, presuming Yahoo to a

storage system.

Regards

Bob Harrison G-PTAG Europa MKI



--

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