Quickee design

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Quickee design - 8/8/2003 6:37:44 AM

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I am designing a new 500 and just to make sure I am not missing anything I have a few questions. I Have the basic requirements of firewall ( 2-1/4 square ) and the depth and width requirements. Is there a length minimum and maximum of the fuselage. Also, is there any rules to the tail requirements also ( location and size)? It has been a while since I have raced Q-500 and the "ole Lady" says lets do it next year so I am going to save a few bucks in the pocket and make my own. Also, in the depth part of the rules, the fuselage has to be 3-1/2" high and 2-7/8 wide. At the highest point of the wing and the bottom of the fuselage, I have it at 3-1/2". Is that legal since it is part of the fuse when it is bolted together or does the fuse have to be 3-1/2" without the wing?

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Quickee design - 8/8/2003 7:38:39 AM

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The rules are at http://www.modelaircraft.org/templates/ama/PDF-files/Rulebook/rc-pylon.PDF, but here are the short answers.

3.5" with the wing. And the 3.5" and 2.875" do not have to be in the same place, just within the wing chord.

Fillets are not allowed at the wing junction, but are allowed on the tail. The tail can be any configuration.

The fuselage must be at least half as long as the wing chord.

Good starting points for the fuselage:

4.375" from firewall to wing leading edge. 18.5" from wing trailing edge to elevator hinge line.

There are some plans online, and I have some that the designers donated for publication on [url]www.PylonWorld.com,[/url] but I don't have them on the site yet. I can email them ... they are in CAD format.

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Quickee design - 8/8/2003 8:51:07 AM

js3

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[QUOTE]Originally posted by PylonWorld
The fuselage must be at least half as long as the wing chord.[/QUOTE]

Don, you mean SPAN not CHORD. That would be an awfully short fuse

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Quickee design - 8/8/2003 9:53:26 AM

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I was uhhh just checking uhhh to see if anybody would uhhh catch me .... yeah, that's the ticket.

Funny topic though ... When I went out to the local field for the pylon demo, a guy had a [URL=http://www.tufflight.com/]TufFlight[/URL] Enduro. And it's fuselage was about half as long as the chord of the wing. That is if you don't count the coroplast fin/rudder.

I'm going to get one for my uhhhh kid, yeah.

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Fuselage Length - 8/8/2003 10:10:20 AM

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Kevin,

7. General Model Aircraft Requirements
(Note: for event-specific requirements such as wing
area, weight, engine displacement, etc., please refer
to the individual event listings.)

7.1. Conventional design. Aircraft used in RC
Pylon events shall be of conventional design with
forward wing, aft horizontal stabilizer, and a single
engine mounted in front. No deltas or other tailless
designs shall be allowed. An aircraft shall be considered
tailless if the ratio of its wingspan to its overall
length is greater than 2:1. The �overall length� of the
aircraft, for purposes of this measurement, is the distance
from the front of the propeller to the trailing
edge of the rearmost movable tail surface.

BV

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Quickee design - 8/8/2003 3:42:43 PM

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[QUOTE]7.1. Conventional design. Aircraft used in RC
Pylon events shall be of conventional design with
forward wing, aft HORIZONTAL stabilizer, and a single
engine mounted in front. [/QUOTE]

Read the quote! I will ask the question again. How come VEE tails??

Ed S

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V TAILS - 8/8/2003 6:18:16 PM

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ED, please READ para 7.3.1 in the Rule Book

7.3.1. Steering:Except in 1/2A, every aircraft
shall be equipped with a positive means of steering
on the ground using a dedicated, operable servo(s).
Aerodynamic yaw control by means of a movable Steering
Rudder or �V� tail fulfills this requirement. In addition,
while in flight, all aircraft shall be positively and
independently controllable in pitch and roll modes
using dedicated, operable servos. Mixing of control
functions is permitted so long as the aircraft remains
positively and independently controllable in both
pitch and roll modes at all times while in flight.

BV

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Swept Wings - 8/8/2003 6:54:16 PM

daven

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Just curious, according to the rules, it doesn't appear that a swept wing would be illegal.

Anyone try one?

Also, how would you measure the length of the wing? Straight across, Or from the tip to the wing cernter, and then to the other tip??

Just trying to stretch the rules for Ed...

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Quickee design - 8/8/2003 7:08:00 PM

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Dave,

I have seen swept wings on Quickies in pictures from other countries. Check out the "Racing Down Under Site". I think that's one of the sites where I saw them.

Since the wing span is measured as the projected wing span, it would be from tip to tip.

This would be one way to effectively lengthen the wing, but it would take a significant sweep to lengthen the wing much.

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Quickee design - 8/8/2003 7:11:25 PM

DMyer

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Back in the early 90's... just after the Nelson revolution... Joe Solko built a 428 version of the 1/2A GLH and raced it in the east. For those that don't know... the GLH(Goes Like Heck) was an ACE RC 1/2A swept wing pylon racer. He raced it for several contest without too much success prior to the wing folding. Joe was an excellent pilot during his younger years... but by the time of the GLH clone, his eyes and skills were not what they once were... so maybe it wasn't the best test for a swept wing. IMO I think it is a evolutionary dead end for the speeds and type flying we do while racing pylon.

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Quickee design - 8/8/2003 7:35:17 PM

DHG

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Dave,

There's no limit on sweep as long as the span remains within the stated limits. You could even do a "gull wing" as long as the chord and thickness didn't change. FWIW, I think a small amount of [COLOR=red]forward[/COLOR] sweep might actually help in the turns. A buddy of mine built one 10 years ago and it flew great but he wasn't the greatest pilot so who can tell if it actually did him any good. (It's the same problem I have with all my cool stuff.)

Ed,

A "V" tail [COLOR=red]is[/COLOR] a "horizontal stabilizer". It's also a vertical stabilizer.

Mr. Totally Liable

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Quickee design - 8/8/2003 9:26:05 PM

js3

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[QUOTE]Originally posted by Ed Smith
Read the quote! I will ask the question again. How come VEE tails??

Ed S [/QUOTE]

Yep. Now the convention IS V tails. So that makes anything else illegal doesn't it?

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Quickee design - 8/8/2003 10:52:42 PM

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Bill,

We cannot pick out the parts that suit us the most. I am aware of the rule you point out. However that is in reference to yaw control only. In other words the airplane MUST have a horizontal stab as stated. For yaw control only the choice is a single vertical stab or a vee configuration in addition to the horizontal stab.

I did not write this stuff. As a contest official I have to interpret it all. Heeeeelp!!!

Ed S

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Quickee design - 8/8/2003 11:34:35 PM

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My "horizontal stab" has a ton of dihedral .... and my "vertical fin"..well it's the little stinger looking thing sticking out past the stab.. it doesn't move because my JR radio allows me to mix my horizontal stab feathers...

That sounds pretty good..... ?? what do you think?

just having some fun....

Randy

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Angle of the dangle - 8/8/2003 11:41:07 PM

DHG

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Ed,

I must admit I never thought of the word "horizontal" as implying that the "horizontal stabilizer" must be absolutely flat. If so, would you then have to disallow an airplane that had a horizontal stabilizer and a vertical stabilizer (a/k/a "conventional tail"

, but with a little bit of dihedral or droop in the horizontal stabilizer just for looks, or to keep it out of the grass, or whatever -- like on a Globe Swift or F4 Phantom jet?

And if an airplane is legal without a vertical tail at all, what's to prevent the designer from simply omitting it and then raising the tips of the horizontal stabilizer ... just for looks, or to keep it out of the grass, or whatever?

I just [COLOR=blue]hate[/COLOR] catching my horizontal stabilizer in the grass.

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Ed's Nightmare - 8/9/2003 3:03:06 AM

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If V-tails are allowed, this should be a legal Quickie.

It meets all of the dimensional requirements.

Sorry the right wing tip is cut off.

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Quickee design - 8/9/2003 4:18:45 AM

bl10