Today's Message Index:
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1. 06:48 AM - Gearleg fairings (Chris Fordham)
2. 07:37 AM - Re: Gearleg fairings (nico css)
3. 06:25 PM - Gearleg fairings, help or hinder ? ()
4. 06:38 PM - : Gearleg fairings alinement method (rocketman)
Message 1
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| Subject: | Gearleg fairings |
An update on the trim problem I am having with the gearleg fairings. I re
rigged the port fairing, by digging out all the foam and refoaming top and
bottom. I moved the gearleg fairing ,trailing edge outboard, by 3/16 of an
inch at the top and an 1/8 at the bottom, now the ball is less than one
width out at full throttle. It didn't take much change in the fairing to
make a big difference in the trim.. Milt suggested I jack the plane up to
take the weight off before setting the final angle, but I don't really have
the facilities to get the legs hanging like that.. I did try to make the
fairings teardrop shaped when I glassed the trailing edge together, and
looking carefully at the final result they didn't hold a consistent shape
top to bottom, so maybe its acting like an airfoil and not only causing drag
but setting up a sideways pressure also. (Just a theory).
Thanks for all the help, what an awesome aircraft!
Chris
Message 2
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| Subject: | Gearleg fairings |
Do you see a difference in speed with the fairings and wheel pants fitted?
-----Original Message-----
From: owner-rocket-list-server@matronics.com
[mailto:owner-rocket-list-server@matronics.com] On Behalf Of Chris Fordham
Sent: Monday, May 12, 2008 6:44 AM
Subject: Rocket-List: Gearleg fairings
An update on the trim problem I am having with the gearleg fairings. I re
rigged the port fairing, by digging out all the foam and refoaming top and
bottom. I moved the gearleg fairing ,trailing edge outboard, by 3/16 of an
inch at the top and an 1/8 at the bottom, now the ball is less than one
width out at full throttle. It didn't take much change in the fairing to
make a big difference in the trim.. Milt suggested I jack the plane up to
take the weight off before setting the final angle, but I don't really have
the facilities to get the legs hanging like that.. I did try to make the
fairings teardrop shaped when I glassed the trailing edge together, and
looking carefully at the final result they didn't hold a consistent shape
top to bottom, so maybe its acting like an airfoil and not only causing drag
but setting up a sideways pressure also. (Just a theory).
Thanks for all the help, what an awesome aircraft!
Chris
Message 3
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| Subject: | Gearleg fairings, help or hinder ? |
It's been more that 5 years ago what Gummibear & I flew a just completed HRII (N561FS)
without paint, gear legs/ wheel pants. We put together the operational
numbers for the HRII at that point in time. Later we installed the gear leg farings
& wheel pants and ran another set of operational numbers. VERY much to
our suprize, (we had heard & dismissed as so much "talk") a gain of 5 MPH in level
speed and a decrease of the stall speed of 5 MPH too (55 to 50). After much
conversation with area notables we believe that the fairings smooths the air
flow for a speed increase & less turbulent air flow under the wings in a pre-stall
configuration. We tired to get a true full power, clean stall with 30 degree
nose high but quit passing thru 14,700. Someplace UP there the HRII will
stall but without oxy we saw no good reason to push the issue. Besides N561FS
is AOA equipted if we need indications above 15,000' KABONG
>From: Chris Fordham <fconsult@telus.net>
>Date: 2008/05/09 Fri AM 10:00:49 CDT
>To: rocket-list@matronics.com
>Subject: Rocket-List: Gearleg fairings?
>
>Hey Fellas
> I've been flying my Harmon Rocket for a grand total of 5 hours now
>and all was going well until I put on the gearleg fairings and wheelpants.
>When I first flew it without the fibreglass bits she would pull to the left
>ever so slightly at full throttle and require very light right rudder to
>keep the ball centered.
> Now with the fairings and pants installed the ball is to the right about 3
>ball widths and requires quite a lot of right rudder pressure to keep the
>ball centered.. I removed the wheelpants last night and flew it like that
>with no improvement, so I guess I have the gearleg fairings creating
>drag.Now my question is would it be the port (left) fairing creating the
>drag and the right one would be OK. or could they both be out. My theory is
>that they are mini airfoils and both could be creating pressure and trying
>to turn the ship around the center point. They look to be in line if you
>just eyeball them, and I was very careful (I thought) in aligning them with
>the airflow when installed, but the best laid plans and all that. I sure
>don't want to make another set of intersection fairings.Anyone have this
>problem? any suggested fixes?
>
>
> Thanks
>
> Chris F
>
>
Message 4
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| Subject: | : Gearleg fairings alinement method |
At 06:44 AM 5/12/2008, you wrote:
>
>
>If rocket rolls to left do two very hard aileron rolls to the right!
if rocket rolls to the right do two very hard aileron rolls to the left
Work fine for me
266HP 470 HRs
PS do this with empty rear seat or may have take a whower and cleanup
the airplane.
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