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c.parkhurst(at)charter.ne
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 Posted: Wed May 17, 2006 8:25 pm Post subject: Rocket Emp |
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Gents
After 6 years of sporadic effort on my F-1 QB (went to the war, moved, got
married, had a baby..) I am finally looking at the light at the end of the
tunnel and praying that it's not a train! Engine is on, panel is in and the
CP is painted so it's starting to look like something. I built a standard
RV-4 tail about 4 years ago and made the mod per John's plans as well as
added .020 skins. Got a couple of questions that I hope some of you smart
guys can help me out with:
1. Has anyone done any mods to the HS spar? Looks a little light as
designed and have been thinking of adding some sort of doubler at the attach
point. Comments/ideas welcome.
2. My ailerons are built but want to add a small trim tab/servo.
Anyone have any experience with that retrofit?
3. Has anyone done any work with the rudder? Is it possible to
balance?
Thanks all...
Chris
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Jim Anglin
Joined: 10 Jan 2006
Posts: 47
Location: Independence, OR (7S5 Airpark)
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| Posted: Thu May 18, 2006 6:34 am Post subject: Rocket Emp |
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As for redesigning important parts like the HS - if you are not an =
aeronautical engineer leave it alone. In fact, what makes you think it =
is suspect when over 4500 RVs and Rockets are flying with it?
Retroing a trim tab is a lot of work when all you have to do is put the =
spring loaded trim lever on the stick. I used it in 2 RVs and my HR II =
and it works great.
I have never heard of anyone balancing this rudder, but see above re =
aeronautical engineer. This should be common sense but you are not =
alone in trying to re-engineer the most successful, safe, and popular =
homebuilt in the world without professional credentials.
Jim Anglin
HR II N144HR
DO NOT ARCHIVE
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_________________
Jim Anglin
HR II N144HR |
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nico(at)cybersuperstore.c
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| Posted: Thu May 18, 2006 7:40 am Post subject: Rocket Emp |
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Good advice. I would hate to see someone change something that causes
dynamic loads on something else that might unexpectedly change you from a
pilot to a skydiver.
Nico
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HR2Flyer
Joined: 10 Jan 2006
Posts: 9
Location: Bountiful Skypark, BTF
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| Posted: Thu May 18, 2006 8:08 am Post subject: Rocket Emp |
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Hi I have done the first two. See below.
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u2nelson(at)prodigy.net
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| Posted: Thu May 18, 2006 6:17 pm Post subject: Rocket Emp |
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Chris
The RV-4 spar is a little light when you look at the negative G.(From
turbulence, not acro) During Neg G the horizontal is lifting the tail, and
this puts compression forces on the top of the spar. If you look at how
this is built, the forward spar is not supported on top and is susceptible
to buckling. On the bottom it is supported by the attachments. The easy fix
is to put a standard .063 extruded angle doubler across the top away from
the vertical fins spar attach and tie it into the ribs. Also the forward
spar of the vertical is pretty thin, I beefed mine up by .032 in the area of
the bolt holes, and tapered the beef up into the spar about 8 inches. AFT
spars seem OK.
Ailerons; MAC trim servo is easily added into the aileron, even after it is
built. The tab can be built right into the trailing edge, I went one bay
out from the root end, and the width to fit between stiffeners and a chord
of about 1.75 inches. The servo is up against the forward spar, attaches to
the access plat which in turn is screwed on to the top of the skin, flush on
the leading edge where the skins overlap already. I did a similar deal for
the rudder also but attached the servo to the skin with doublers on the
inside, you would need to do this as you built the rudder.
As for balancing the rudder; Most don't and seem to not have any issues. I
built a mass balance for mine, and balanced about 50%. Peace of mind I
suppose, also lightens the rudder forces a bit.
My F-1 with RV-4 tail and most HRIIs I have flown, when loaded to an aft CG
like with a pax., have some Dutch roll in turbulence, although I have heard
the ones with the RV-8 vertical tail do not. I increased the size of my
vertical about 4 inches over stock RV-4 and I think it helped the situation
but did not totally solve it either. IMO the vertical tail needs to be a bit
bigger, and later F-1 kits have a much bigger vertical fin and I have not
heard any complaints.
Greg Nelson
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