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1. 12:51 AM - Re: Titanium Landing Gear (Fred Weaver)
2. 10:22 AM - Titanium (Jim & Betty)
Message 1
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| Subject: | Re: Titanium Landing Gear |
--> Tailwind-List message posted by: "Fred Weaver" <Mytyweav@earthlink.net>
Lots of luck Chuck... You have been warned. 10-12 pounds is nothing
compared to a wobbly feelin' gear.
And yes, I also have a Harmon Rocket. It has Titanium gear legs. I don't
know the alloy as I write this. BUT, the gear leg is much larger in diameter
than a Tailwind gear. And yes, again to the location of the axles. They
should be almost directly under the Leading Edge when the airplane is bubble
level.
Weav
----- Original Message -----
From: <Rcaprd@aol.com>
Subject: Re: Tailwind-List: Titanium Landing Gear
> --> Tailwind-List message posted by: Rcaprd@aol.com
>
> Thank you all for your responses. It is what makes this list so valuable.
> Rich E. - weight savings is what I'm after. If I can save 10 to 12
lbs.,
> then it will be worth it...given the shimmy tendency is eliminated. Even
if
> it costs me some extra bucks, it pays dividends with every flight.
> Bob T. - I was hoping someone had some input on the machining of
> Titanium. Do you know what alloy you were working with ? There is quite
a few
> different alloys. Two of them are 6AL-4V, and 3AI-2.5V. The 6AL-4V is
what
> Titanium Joe has in 1.375" round solid. He also has it in the diameter
for the tail
> wheel. The 3AI-2.5V is what the seamless tubing is. The first number in
> these designators, is the percent of Aluminum is in the alloy - the second
number
> represents the percent of Vandadium - the remainder is Titanium. Another
> designator is C.P., which stands for Commercially Pure Titanium (99.9%
Titanium).
> Forest L. - If Steve Wittman was using Titanium, then there must be
> something to be had with it...like his Scimitar Props !!
> Fred W. - I would like to talk with Harmon Lange on this subject. Is
his
> number still 503-397-1478 ? That's what is listed in T.T. Do you have a
> Harmon Rocket ? What type gear is on the Rocket ? How can I contact John
> Harmon ? As far as removing weight up front on the Tailwind, well, I have
added 2"
> at station 0, in my fuselage jig. However, this brings up another ripple
> effect. Most are in agreement that the W10 axles should be 8" to 8 1/2"
behind
> the firewall. The thing is, the axles should be placed in relation to the
> leading edge of the wing. The plans view, show the axles parallel with
the
> leading edge. Therefore, should I keep this location, by sweeping the
axle
> alignment back the additional 2" that I added at the firewall ? As far as
the
> springiness, hickory, wraped in Kevlar / epoxy, could be used to fair in
the round
> legs, and also serve to damp out the harmonics.
> Mike M. - Tapered gear legs would be preferred for aerodynamic
reasons,
> as well as a way to set the placement of the flex, and the spring rate.
> Hjelle - Could that shimmy have been caused by an out of balance wheel
/
> tire ? It seems this is the primary cause of gear shimmy on the Tailwind
> taper leg gear. Is there any way you, or anyone else, could come up with
the
> precise dimensions of that gear ?
> Bob T. - The weight comparison is one of the things I was looking for.
> Joe Maj. - The modulus of elasticity is one of the characteristics
that I
> could not find anywhere. Where did you get these figures ? This is the
> reason the dimensions could not be the same as for the 6150 or 4340 steel
gear.
> What is the difference between the modulus of elasticity of 6150 and 4340
? I
> believe the meaning of which is the point where a material can be bent,
and
> will return to it's original form. If steel is bent, and never exceeds
it's
> modulus of elasticity, it will not fatigue. Aluminum, however, will
fatigue in
> short order, even when it doesn't exceed it's modulus of elasticity. How
does
> Titanium, in its various alloys, perform in this manner ?
>
> Chuck G.
> In the Research Mode !!
>
>
Message 2
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When machining titanium use slow speed and slow feeds. Once the drill, end mill
or bit starts cutting keep it cutting. Use lots of coolant in all machining
processes. I mean use lots of coolant and flood that cutting area. The machining
process can generate a lot of heat. Keep the machining area or sworf picked
up after each process. Keep a bucket of sand on hand for safety. If titanium
catches on fire do not I repeat do not throw water on the. Dump the sand on it.
It acts in a similar fashion to magnesium.
Someone else may want to verify this but it is my understanding that titanium has
a much shorter lifecycle than steel alloys.
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