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Old Jul 10, 2003, 03:03 AM
RFair
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[EFLT] Todd's Tiger Two

This message from "RFair" <r.fair@insightbb.com> brought to you by EFLIGHT!

Before you take out too much wood and redesign the wing structure think
about what it needs to do .... If you are going to have wing mounted LG and
the weight is going to be six pounds or so ready to go, all the stresses of
a not so perfect landing are going to be transmitted from the heavy fuse
(bats radio gear .. motor) out through the spars and webs to the landing
gear..... If you are putting the gear on the fuse it may need to be
reinforced at the mounting points..
If you are leaving it in the wing keep in mind that you are going up 25 or
so percent on the design weight .... how well you land has a lot to do with
what you may or may not be able to get away with to save a few grams of
insurance... FWIW ....If I recall correctly , most of the fellows around
here who have built the T-2 said the sheer webs did fit pretty well between
the spars as originally designed without a lot of sand to fit business...
The Tiger Two is a really nice plane and a joy to fly .... You should have
a great time with it ...



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Old Jul 10, 2003, 03:03 AM
Ted Temer
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Re: [EFLT] Todd's Tiger Two

This message from "Ted Temer" <temer@c-zone.net> brought to you by EFLIGHT!

RFair:

You have an excellent point. I do hope that I--and others--have qualified
our suggestions well enough that no one would overlook the need for
reinforcing strength around landing gear blocks.

Naturally this need would be greater on the lower inboard spars than
anywhere else. One would hope that the ribs themselves would resist any
tendency for the wing to flex, (twist), under landing loads. On our Nor-Cal
Aero kits we addressed this by doubling the ribs attached to the landing
gear blocks. We also made sure that the ribs in this area ran from leading
to trailing edge to give maximum fulcrum purchase. (Note: We still had a few
customers land hard enough to yank out wheels, gear, blocks and all. -sigh)

As far as reinforcement is concerned, the spars need only be kept at full
size in the area where they are attached to the landing gear blocks. In the
partially sheeted wing that was described, the spars function--other than
reinforcing the landing gear blocks and attaching the shear webs--serves
more to satisfy tradition rather than any real, overwhelming need to
maintain flight load integrity.

I would also argue to a small extent--that converting a model to e-power
adds only a very small increase in weight. Remember, we are removing a heavy
engine and replacing it with a much lighter motor. We no longer need a
muffler. In addition, we are getting rid of some eight to ten ounces of
tank, fuel and assorted fuel and pressure plumbing. And for those who
bother, much smaller--and lighter--firewalls, bracing, etc. can be utilized
in the engine compartment due to the enormous reduction in vibration
inherent in electric motors.

Therefore--the net increase in weight may well be around a pound or
less--depending on the size of the batteries needed for the intended flight
time. Any "40" sized model should be able to absorb this much weight
standing on it's head. (My aircraft's usual attitude at completion of a
landing.)

big grin
Ted Temer AMA 86837
Pres. Anderson Park Flyers
Temercraft Designs Redding, CA
temer@c-zone.net
www.temercraft.com/novels/
www.andersonparkflyers.org

>
> Before you take out too much wood and redesign the wing structure think
> about what it needs to do .... If you are going to have wing mounted LG

and
> the weight is going to be six pounds or so ready to go, all the stresses

of
> a not so perfect landing are going to be transmitted from the heavy fuse
> (bats radio gear .. motor) out through the spars and webs to the landing
> gear..... If you are putting the gear on the fuse it may need to be
> reinforced at the mounting points..
> If you are leaving it in the wing keep in mind that you are going up 25 or
> so percent on the design weight .... how well you land has a lot to do

with
> what you may or may not be able to get away with to save a few grams of
> insurance... FWIW ....If I recall correctly , most of the fellows around
> here who have built the T-2 said the sheer webs did fit pretty well

between
> the spars as originally designed without a lot of sand to fit business...
> The Tiger Two is a really nice plane and a joy to fly .... You should

have
> a great time with it ...
>




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Old Jul 10, 2003, 03:03 AM
Todd Tillmann
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RE: [EFLT] Todd's Tiger Two

This message from Todd Tillmann <toddt@badgerpackaging.com> brought to you by EFLIGHT!


I'm really getting a kick out of this discussion! Lots to learn.

To clarify in my specific case, I'm converting to a taildragger and mounting
the main landing gear on the fuselage--I'll try to tie in the majority of
the battery tray structure in this area. My wing won't have to deal with
landing gear blocks.

I'll add one more observation: I've see numerous photos and videos of 3D
type airplanes, and I've seen some that have lightening holes through the
shear webs, or that have no shear webs at all. Instead it looks like they
have an upper and lower spar structure made of strips of wood glued into a
"T" shape. Hard to believe that is strong enough, but what do I know?

Todd


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