Today's Message Index:
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1. 11:47 AM - -4 tail mods?? (Parkhurst Maj Christopher J)
2. 07:28 PM - Re: -4 tail mods?? (u2nelson)
Message 1
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--> Rocket-List message posted by: Parkhurst Maj Christopher J <ParkhurstCJ@3MAW.USMC.MIL>
Well, I'm back from shooting at the indians and the USMC was kind enough to
send me up to Reno to be a TOPGUN Instructor....bummmer! All moved into my
new hanger at Stead field and pushing ahead full steam (again) on building
my F-1(#20). Almost have enough parts to put together an airplane.
Question: I have completed an RV-4 tail to John's plans (still have to move
bottom rib of VS..ooops) but am interested in beefing up the HS spar.
Anyone done this? Seems to me that the Fwd spar is a little thin and could
do with a douber in the middle and/or a couple of angles at the inboard
ribs. I know there are some smart guys out there with ideas, just remember
to make them "Marine-proof". Thanks in advance.
Semper Fi
Chris "Screech" Parkhurst
Maj USMC
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-4 tail mods??
Well, I'm back from shooting at the indians and the USMC was kind enough to send
me up to Reno to be a TOPGUN Instructor....bummmer! All moved into my new hanger
at Stead field and pushing ahead full steam (again) on building my F-1(#20).
Almost have enough parts to put together an airplane.
Question: I have completed an RV-4 tail to John's plans (still have to move bottom
rib of VS..ooops) but am interested in beefing up the HS spar. Anyone done
this? Seems to me that the Fwd spar is a little thin and could do with a douber
in the middle and/or a couple of angles at the inboard ribs. I know there are
some smart guys out there with ideas, just remember to make them Marine-proof.
Thanks in advance.
Semper Fi
Chris Screech Parkhurst
Maj USMC
Message 2
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--> Rocket-List message posted by: "u2nelson" <u2nelson@prodigy.net>
The RV-4 horizontal is indeed in need of some beefing up. The forward spar
is week at the top in compression, a loading situation that is not normally
encountered, but with enough speed and some negative G, like in turbulence,
it is possible. The failure mode is buckling. To fix this add a standard
extruded angle to the top of the spar, spanning the forward spar from rib to
rib. Once the spar is inside the ribs, and under the skin there is no
problem with buckling. You can pick up the rivet pattern of the planned
rivets. The only other area I beefed up was the forward spar of the
vertical, doubling it with a piece of .032 and extending up a couple inches
into the skin area, this was primarily for extra sheer resistance against
the attach bolts.
Greg Nelson
N144X
-----Original Message-----
From: owner-rocket-list-server@matronics.com
[mailto:owner-rocket-list-server@matronics.com]On Behalf Of Parkhurst
Maj Christopher J
Subject: Rocket-List: -4 tail mods??
--> Rocket-List message posted by: Parkhurst Maj Christopher J
<ParkhurstCJ@3MAW.USMC.MIL>
Well, I'm back from shooting at the indians and the USMC was kind enough to
send me up to Reno to be a TOPGUN Instructor....bummmer! All moved into my
new hanger at Stead field and pushing ahead full steam (again) on building
my F-1(#20). Almost have enough parts to put together an airplane.
Question: I have completed an RV-4 tail to John's plans (still have to move
bottom rib of VS..ooops) but am interested in beefing up the HS spar.
Anyone done this? Seems to me that the Fwd spar is a little thin and could
do with a douber in the middle and/or a couple of angles at the inboard
ribs. I know there are some smart guys out there with ideas, just remember
to make them "Marine-proof". Thanks in advance.
Semper Fi
Chris "Screech" Parkhurst
Maj USMC
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
<META NAME"Generator" CONTENT"MS Exchange Server version 5.5.2653.12">
-4 tail mods??
Well, I'm back from shooting at the indians and the USMC was kind enough to
send me up to Reno to be a TOPGUN Instructor....bummmer! All moved into my
new hanger at Stead field and pushing ahead full steam (again) on building
my F-1(#20). Almost have enough parts to put together an airplane.
Question: I have completed an RV-4 tail to John's plans (still have to move
bottom rib of VS..ooops) but am interested in beefing up the HS spar. Anyone
done this? Seems to me that the Fwd spar is a little thin and could do with
a douber in the middle and/or a couple of angles at the inboard ribs. I know
there are some smart guys out there with ideas, just remember to make them
Marine-proof. Thanks in advance.
Semper Fi
Chris Screech Parkhurst
Maj USMC
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