Today's Message Index:
----------------------
1. 08:00 AM - Re: Vx Vy Best glide (Jim Stone)
2. 09:28 AM - Empenage fairing (Bryan Carr)
3. 11:29 AM - Re: Vx Vy Best glide (Hr2pilot@aol.com)
4. 12:48 PM - Re: HRList... Vx Vy, placards...more? (JOHNTMEY@aol.com)
5. 05:34 PM - Re:Performance and Cert (JOHNTMEY@aol.com)
Message 1
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| Subject: | Re: Vx Vy Best glide |
--> Rocket-List message posted by: "Jim Stone" <jrstone@insightbb.com>
Good post Les!
----- Original Message -----
From: <Morocketman@aol.com>
Subject: Re: Rocket-List: Vx Vy Best glide
> --> Rocket-List message posted by: Morocketman@aol.com
>
> An excellent question. And an excellent explanation can be found on my
> local "Missouri Pilots Association" web site written by our own Larry
> Harmon.
> See mopilots.org/sgf/jan2001sgf2.htm. Larry describes the generic values
> for
> Vx, Vy, and Best Glide speeds, and these are fine for the Rocket. I just
> add
> the caveat that the Rocket has such an abundance of power that Vx is
> really
> on the edge should the Lycoming get quiet. It is generally agreed (by
> most
> test pilots) that Vx is/or about Vs + 20%. Commonly expressed as 1.2 x
> Vs. In
> my Harmon (no relation to Larry) Rocket II, Vs is about 55 to 56 knots
> depending on who is counting. Computing Vx of 66 knots at full takeoff
> thrust
> would give a body angle that would be very, very dramatic. Assuming
> something
> came undone, it would require a very rapid pitch over to maintain some
> semblance of control near/above the desired Va approach speed (Vs + 30%
> or 1.3 Vs
> or 73 knots which is the perfect over-the fence feel airspeed). It is
> simply
> not necessary. My airplane climbs like a "rocket should" at 1.4 x Vs or
> 78
> to 80 knots. Now, to address a very different
> subject......................... Vy. Oh what a strange, and vague speed
> that is, and how do we find it?
> Technically, Vy should be 1.4 Vs, again the 78 knot number which
> coincidentally
> should also be best glide speed. My explanation is that we are much like
> a
> Century Series jet fighter...........they simply forgot to put enough
> "wing
> on the thing." An RV-? wing of any kind is a short span, dare I say
> chubby
> cord, and thick wing. When we clipped our RV-4 wings to the Rocket
> length, we
> knew we were going the wrong way for gliding. Just look at the high
> performance sailplanes with their extremely high aspect ratio "straight
> razor"
> looking wings. My RV-4 felt-about-right at 85 knots for Vy, and my Rocket
> is a
> whole lot more like 100 knots. If I lost the engine on the Rocket, and
> was
> able to get it to course pitch, I would think a great deal about 90 to
> 100 knots
> until the last three hundred feet. And only then would I reduce to the
> desired 73 knots IAS. I know the other factors like weight, wind gusts,
> density
> altitude, etc., but these are just guidelines from my own very humble
> opinion
> and 700+ hours on the stubby RV wings. Ya'll be careful out there, and
> mainly fly the airplane where you (and it) feel comfortable. Les
> Featherston
> "Airgasm" 228 hours, and just lovin' it!
>
>
>
Message 2
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| Subject: | Empenage fairing |
--> Rocket-List message posted by: "Bryan Carr" <b.m.carr@telus.net>
What is the best fitting empennage fairing for the Harmon Rocket 2?
I hate fiberglassing.
Bryan Carr
Message 3
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| Subject: | Re: Vx Vy Best glide |
--> Rocket-List message posted by: Hr2pilot@aol.com
VX 90 MPH
VY 125 MPH
VSO 58 MPH
VSI 64 MPH
VA 164 MPH
Message 4
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| Subject: | Re: HRList... Vx Vy, placards...more? |
--> Rocket-List message posted by: JOHNTMEY@aol.com
Listers....good thread recently.
Mine's about flight ready. I'm trying to nail down some things for my brain
to rehearse before 1st flight. Also making a rudimentary Airplane Flight
Manual. Making placards too.
1. John (or others), what is the fuel capacity with bigger tanks ?
2. Anyone know the unusable fuel value ?
3. Insurance. I know the general protocol on insurance ... just wondering
what the current rates and rules are ?
Who is a good agent? I can show reasonable currency and tailwheel recency
in Cubs, Champs, Luscombe, PT22.
4. What is the customary, assigned local flight time limit assigned by the
DAR ?
5. When you'all are looking at landing your beauty at a boondock
destination, paved airstrip, what is the shortest, narrowist strip you would consider
?
Maybe that's a hard question to put numbers upon... how about same question
relative to the usually quoted landing distance over a 50' obstacle, zero
wind, moderate braking.?
Many thanks for any replies.
John Meyers HRII N5800 sn 233 do not archive
Message 5
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| Subject: | Re:Performance and Cert |
--> Rocket-List message posted by: JOHNTMEY@aol.com
Wow, good information.
I weigh about 150 and should have a middleweight airframe.
Home airstrip is 1600' paved with 500' solid grassy smooth runout. Paved
about 35' wide and has 80' trees at one end.
I won't try landing there until well-practiced. Wheel landings are my
favorite mode. Complex is current. Guess I will see what the insurers say.
Can one get any coverage in the flight test phase ?
My engine is re-built as a C4B5 but is undoc-ed and logless. Guess that's
experimental. Let's see... 40 hours at 15 gph x $10/gallon equals... gulp *
John Meyers do not archive
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