Today's Message Index:
----------------------
1. 07:11 AM - RV9A Prop Pitch (ivo welch)
2. 08:22 AM - Re: RV9A Prop Pitch (Ed Zercher)
3. 11:39 AM - w-905 bottom wing (Ken)
4. 01:11 PM - Re: Wing Help (The Strong's)
Message 1
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--> RV9-List message posted by: ivo welch <ivo.welch@yale.edu>
hi guys: thanks for all your comments.
larry: I have not systematically determined my airspeed. I am also a bit
envious that you have a Subaru powered RV9A. I hear they are very quiet. Are
you happy with it? On my Lycoming 160hp, I do not get TAS of 160-170mph at
10,000' altitude. I seem to be getting something more like 150mph, but again,
this is more impression than fact.
dick: I forgot to say that I have the 160hp Lycoming dinosaur. And, yes, my
plane too requires considerable right rudder right now. I need to get myself a
little rudder trim made. Slowing down an RV-9A is definitely not an easy task.
Most people who start flying one and want to do an ordinary VFR landing
(power-off landing) rather than a powered-type IFR landing overshoot the
runway. Believe me: I have done this many times. It is hard to get the RV-9A
to stop flying. I sometimes think I own a sailing plane with an engine.
Incidentally, for builders who have not yet flown: be ready for a goaround if
you cannot get the plane down. Don't be too eager. the hardest aspect of
flying the RV-9A is post-landing ground handling. It is not *very* hard,
though reasonably challenging. (in comparison, everything else is easy flying.
on the 9A.) I think the main "problem" is that the 9A is just a very light
plane. I also sometimes wonder if the landing tires are closer together than
they are on the pipers, but I think the flimsier and freely moving front wheel
together with the powerful rudder is what makes control after landing more
difficult. Maybe it might have been better for the 9A not to let the front
wheel pivot so freely, but to give it a tendency to want to keep straight.
(Anyone tried this? Maybe two small springs could do the job.)
ed: thanks again for your email. great to see you on this forum, too. The
RV-9A definitely is a real jumper off the ground. I see 2000fpm alone and
1500fpm with a passenger. This is at sea level. I vaguely remember that I can
still get standard IFR climb rates at 11,000 feet with passenger during the
absolute heat wave on the east coast last year. At this altitude, I stopped
experimenting. In other words, this thing climbs so fast, climb speed is not a
concern. This is also why I can pitch higher if this were to get me more
cruise speed.
I think I can only order 79 or 81 from Vans. So, I posted here to get an
educated guess on whether the 81 is too overspun for maximum cruise speed. I
gather from your note that you are not sure, but you would guess not.
Andy: you are correct, I am flying N994KS. Kevin did a great job (and is a
really nice chap, too!) I got lucky. Now, how do you determine that something
is "oversped" rather than "undersped"? Does Sam B get better cruise TAS
speeds? (I presume these are all impressions, anyway, as this is really
difficult to determine, except in a perfectly controlled wind tunnel.)
And, for those of you who are wondering about avionics, my panel revamp plan is
at http://welch.som.yale.edu/n994ks/newpanel.html . I have learned from flying
what I want.
thanks again, and regards,
/iaw
PS: I only subscribe to the list, so I only get once per day the emails.
--
Ivo Welch, Professor of Finance/Economics, Yale/SOM+NBER
http://welch.som.yale.edu/
Message 2
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--> RV9-List message posted by: "Ed Zercher" <ez@sensenich.com>
Ivo and all,
Since Ivo made the statement, "I think I can only order 79 or 81 from Vans,"
and I hear it all the time, I thought I would get the word out that you can
order whichever pitch best suits your aircraft's needs. In Ivo's case, if
you would like to start out sitting on the fence, you may order an 80 pitch.
The 70CM series can be ordered anywhere from a 73 to an 84.
Ed
Message 3
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| Subject: | w-905 bottom wing |
--> RV9-List message posted by: "Ken" <ken@peggyking.com>
I found this also, along with some other things that I dedided to
change/correct. The list is copied below. Sorry for the lengthy discourse.
Ken Anderson
Kirkland, WA
RV 9A Builder 90376
Wing Construction Instruction and drawing suggestions
1. Description, Part # or process
2. Drawing
3. Problem statement
4. Corrective action
5. Sketch or photo
1. Wing panel outer, bottom. Match drilling to ribs
2. Drawing
3. The outer four ribs do not have matching holes ( the fourth hole from
the
TE is misplaced by xx inches
4. Drilled rib to match hole in the skin
1. Rivets -Flap & Aileron Fairings to wing skin
2. Drawing
3. The rivets called out were AN4260AD3-3. They should be AN4260AD3-3.5.
4. Used AN4260AD3-3.5 rivets
1. Aileron drill counterbalance tube to rib
2. Drawing
3. The instructions say to drill the mark/drill the counterbalance tube
to
the spar/fwd rib assembly. This could (and did) cause the counterbalance
tube to put a built-in twist to the aileron assembly.
4. Wait until after attaching the bottom skin on the main ribs with keeper
rivets, and make sure the aileron is flat on the bench top before marking
and drilling the counterbalance tube.
1. Aileron spar
2. Drawing
3. The right spar (A-90xx-R) is identical to the left spar. I expected
a
mirror image, because the holes for the fwd ribs are not symmetrical ( the
center hole is located more toward the top hole). Also, the spar inboard
end is different from the outboard end. Therefore, the holes for the fwd
ribs do not match the holes on the spar ( the ribs would otherwise be upside
down.)
4. Re-drill the spar to match the center hole on the fwd ribs. The spar
ends up with an extra hole for each rib.
1. Aileron Spar to skin rivets
2. Drawing 11
3. The rivets callout for the spar-skin-leading edge skin is a 3.5.
Measuring with a gauge, it seems that the rivets are a little short.
4. I chose to use AN4260AD3-4 rivets, although the called for rivets would
be sufficient.
1. Aileron trailing edge rivet callout
2. Drawing 11
3. The callout for the trailing edge rivets is for AN4260AD3-3.0 rivets.
Which were to short
4. I chose to use AN4260AD3-3.5 rivets
--> RV9-List message posted by: "Jim Hosie" <jhosie4@attbi.com>
Working on the right wing (first one I'm doing) the w-905 bottom wing
skin lines up 100% with the w- 911 and w-912 ribs except the 7th hole
from the trailing edge in w-905 with the four outboard w-912 ribs.
Message 4
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--> RV9-List message posted by: "The Strong's" <tstrong@ida.net>
This is interesting. My kit number is #90489 and those holes are still
mismatched. I guess Van's just likes to make
sure they will have a few easy questions to answer.
Tom (working on wings)
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