Today's Message Index:
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1. 05:57 AM - Re: Schimitar Origin (nightmare)
2. 04:10 PM - Ash board placement (aviken)
3. 06:06 PM - Extended Fuselage Question (GrantZ)
Message 1
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| Subject: | Re: Schimitar Origin |
In addition......One of my prop making books by Eric Clutton explains that a true
scimitar prop has the grain of the wood positioned fore and aft rather than
up and down (as seen from being mounted on engine). Each thin lamination is also
bent into that position as well while laminating. (Using a 4 x 4, similar
to prebending cap strips). This allows more flex and allows tip to go to a lower
angle of incidence when under load, during climb. variable pitch with no moving
parts. No idea how affective it really is though. Much more difficult to
built too. The current wave of scimitar are really semi-scimitars. Because of
the same shape but different grain direction, they are about 35% as effective
in changing pitch as the scimitar. Above all paraphrased from "propeller making
for the amateur". Great book.
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Paul Donahue
Started 8-3-12
do not archive
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http://forums.matronics.com/viewtopic.php?p=415857#415857
Message 2
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| Subject: | Ash board placement |
Someone please clear this up for me. According to my plans, the rear ash cross
brace marking is in the center of the board. I temporarily placed it in that
position and measured the other cross struts from there back , and they seemed
to work out right. The next question is the front ash board is marked a
little to the rear of center. Is this just bad aim in drawing the plans, or is
there a reason for these two markings?
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http://forums.matronics.com/viewtopic.php?p=415879#415879
Message 3
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| Subject: | Extended Fuselage Question |
Construction is progressing well. Five ribs built and turning out about 1.5 per
day.
I am reviewing the supplemental plans and laying out fuselage sides.
On the extended fuselage, how does one determine where the "cross struts" (go between
the sides) are located?
No dimensions for these on the supplemental plans that I can see. With the added
length the dimensions from the original fuselage clearly won't work. I can
see where two inches were added in the first and third bays but this does not
help locate the struts. I would think these locations are critical as they determine
landing gear, lift strut, cabane, etc attach points.
What am I missing?
Thanks
Grant Ziebell
Savannah, TN
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http://forums.matronics.com/viewtopic.php?p=415891#415891
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