Today's Message Index:
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1. 05:47 PM - Warp drive prop and prop hub extension (Chris Boultinghouse)
2. 06:31 PM - Re: Warp drive prop and prop hub extension (Jim Stone)
Message 1
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| Subject: | Warp drive prop and prop hub extension |
--> JabiruEngine-List message posted by: "Chris Boultinghouse" <sonex260@austin.rr.com>
Hi everybody,
Let's get this new list rolling with some actual engine-related questions!
I purchased a 2" prop hub extension with my Jabiru 3300, and have installed
it following the instructions found on the US Jabiru site in the Zenith FWF
section:
http://www.usjabiru.com/Zenith%20FWF%20Images/71.%20Fitting%20of%20prop%20fl
ange%20extension.PDF
Note that step 9 says "With the Prop flange extension, lockwiring of studs
is almost impossible." I can verify that! My question is, with the use of
red (permanent) Loctite and the Belleville washers do you think the lockwire
is mandatory?
Next question is about prop choice. I've heard conflicting reports regarding
the use of the Warp Drive prop on the 3300. I understand the issues of
inefficient airflow at the roots, but think that with a proper spinner and
cooling inlet design this can be minimized. The fact that Andy's Airmaster
installation (which uses Warp blades) cools fine supports that theory.
The Norwegian Jabiru site has an interesting comparison test between several
props, with the Warp drive coming out on top:
http://www.jabiru.no/PropTest.htm
I have also seen the report of cracked hubs with the Warp Drive/Jabiru
combination, but that is the lightweight hub. The much beefier HP hub is
what should be used on direct drive engines.
My initial choice was an Ed Sterba wood prop (around $400) but the idea of
being able to adjust the pitch until satisfied makes the Warp drive
(comparably priced, I believe) appealing.
Any comments or advice appreciated!
Regards,
Chris Boultinghouse
Austin, TX
Sonex N260SX (reserved)
http://sonex260.wheelsup.org
Message 2
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| Subject: | Warp drive prop and prop hub extension |
--> JabiruEngine-List message posted by: "Jim Stone" <jsto1@tampabay.rr.com>
Safety wiring the hub bolts does take some dexterity with a long pair of
needle nose pliers in addition to regular safety wire pliers. The
reverse is also true, but achievable, having done both. Remember to
only do pairs of bolts, rather then trying to do all 6 at once. I have
also seen the permanent "locktite" used. Just make sure you have a
calibrated torque wrench and the correct settings. That goes double for
the prop bolts. I would also go with a minimum 3/8" prop bolt, the
Jabiru 1/4" bolts in my opinion are undersized.
-
--> JabiruEngine-List message posted by: "Chris Boultinghouse"
--> <sonex260@austin.rr.com>
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