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Search: Posts Made By: thumbsup
Showing results 1 to 25 of 32
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Forum: Scratch Building, Aircraft Design, 3D/CAD
01-28-2005, 08:30 AM
Replies: 13
Views: 1,191
Posted By thumbsup

RE: how do i figure out how much servo for a given ammount of control surface?

Joseph,

Your animation looks like "glubber" - the green jelly stuff from the (somewhat old) movie with Robin Williams...

I guess I was overly conservative on my calculations above... I have...
Forum: Scratch Building, Aircraft Design, 3D/CAD
01-18-2005, 11:30 PM
Replies: 13
Views: 1,191
Posted By thumbsup

RE: how do i figure out how much servo for a given ammount of control surface?

Joseph "Glubber"... that's Glubber, isn't it:D?

The S3004 has 44.4 oz.in of torque at 4.8V, according to the Futaba catalog (available in the net). With that torque I believe that, to stay on...
Forum: Composites Fabrication And Repair
06-17-2004, 08:23 PM
Replies: 17
Views: 2,548
Posted By thumbsup

RE: foam wing cutting

Chris,

Airfoil: Eppler 423 (root and tip)
Span: 71.66in (two pieces of 35.83?)
Root: 21.65in
Tip: 14.17in
Sweep: Leading edge, 6°
Washout: some 3°
Dihedro: Whateverit takes to make...
Forum: Composites Fabrication And Repair
06-11-2004, 05:00 PM
Replies: 17
Views: 2,548
Posted By thumbsup

RE: foam wing cutting

Hah!
I had been cutting them out of tin sheets with big scissors![:'(][&:]
My friends are more built-up inclined, you know, so I guess I should have not reinvented the wheel.
I will try the...
Forum: Composites Fabrication And Repair
06-11-2004, 05:31 AM
Replies: 17
Views: 2,548
Posted By thumbsup

RE: foam wing cutting

Hello, everyone!

I always have spend a LOT of time polishing the templates so the wire will run smoothly. Is there a way to avoid this? - I mean, formica is better than aluminum? Or zinc sheets?...
Forum: Scratch Building, Aircraft Design, 3D/CAD
02-17-2004, 12:12 AM
Replies: 11
Views: 1,315
Posted By thumbsup

RE: Wing Structural Design

Ooops,
a better picture...
Forum: Scratch Building, Aircraft Design, 3D/CAD
02-17-2004, 12:11 AM
Replies: 11
Views: 1,315
Posted By thumbsup

RE: Wing Structural Design

Actually, this is going to be my second year on the Brazilian SAE competition. 2004 rules: cargo bay 4x5x6in, max wing span 6ft, t.o. within 200ft...
I'll graduate this year on Mechanical...
Forum: Scratch Building, Aircraft Design, 3D/CAD
02-16-2004, 04:48 PM
Replies: 11
Views: 1,315
Posted By thumbsup

Wing Structural Design

Hello, my friends.

Where and what kind of stresses can be expected on the wings of those (SAE) weight-lifting airplanes?

Thanks. Souza.
Forum: Aerodynamics
10-15-2003, 01:49 AM
Replies: 79
Views: 5,692
Posted By thumbsup

RE: A puzzle for you

I wonder how much velocity would the fly have to have to stop the momentum of a 20mph train...
I figure it would have turned itself into pure energy (E=mc^2) by the time it could stop that 148...
Forum: Aerodynamics
10-14-2003, 11:14 PM
Replies: 29
Views: 3,997
Posted By thumbsup

RE: Tricycle Biplane - SAE Competition

Huummm, we sized Ébrios' tail, among other things, to avoid spiral instability - once the airplane would turning at low speeds some 50% of the time. There was fear that a big fin coupled with little...
Forum: Aerodynamics
10-12-2003, 06:58 PM
Replies: 1
Views: 542
Posted By thumbsup

RE: Aerolift competition

Hello, Mike.

These events are organized by SAE. Check out the "Tricycle Biplane - SAE Competition" post and the SAE site: http://www.sae.org/students/aerodes.htm

Best regards. Souza.
Forum: Aerodynamics
10-12-2003, 06:28 PM
Replies: 29
Views: 3,997
Posted By thumbsup

RE: Tricycle Biplane - SAE Competition

TonyF,
I'm certain you're right - it is not easy for the pilot either, but I was disapointed. Both with the pilot and with myself for not having a Plan B - like being licensed myself.
I have...
Forum: Aerodynamics
10-10-2003, 04:59 PM
Replies: 29
Views: 3,997
Posted By thumbsup

RE: Tricycle Biplane - SAE Competition

Ben,
I'm afraid I do not know what a GWS flat foam is...
Do you mean testing the aerodynamic concept with a simpler foam-made built assy? Do you mean flying the foam thing before building the...
Forum: Aerodynamics
10-10-2003, 10:33 AM
Replies: 29
Views: 3,997
Posted By thumbsup

RE: Tricycle Biplane - SAE Competition

dr_wogz,
the rules were the same as always, except for the allowed "shadow" which was substituted for a wing span limit of 72 inches. No more area limits; just the wingspan... 300 cu in minimum of...
Forum: Aerodynamics
10-08-2003, 09:00 AM
Replies: 29
Views: 3,997
Posted By thumbsup

Tricycle Biplane - SAE Competition

Hello, my friends!

Just wanted to share a picture of my own design for the SAE weight lifting competition in Brazil last September...
Learned a lot there! LOTS of hard work - will do it all...
Forum: Aerodynamics
07-16-2003, 03:36 PM
Replies: 5
Views: 938
Posted By thumbsup

Bi Plane noses down with rudder ?

Hi ST, hi everyone.

Is it "inercia coupling"? Sounds like it... Andy Lennon (R/C Model Acft design, p.42) and Daniel Raymer (Acft Design: A Conceptual Approach, p.444) both recommend increasing...
Forum: Aerodynamics
05-15-2003, 06:16 PM
Replies: 1
Views: 2,074
Posted By thumbsup

Lift and Drag calculation: which wing area?

Hi, everyone!
When figuring out a body's Drag, it is customary to use the projected frontal area of the body (the fuselage, for example) in the calculations.
Why the Lift and Drag calculations for...
Forum: Kit Building
04-08-2003, 06:23 PM
Replies: 13
Views: 1,746
Posted By thumbsup

Wing Construction - all balsa or sheeted foam?

Doesn't it depend on the application?
For example, the airplanes for the SAE competion will never fly faster than 50mph. Still their wings will need to withstand some 25~30lbs, plus gusts, 60 degree...
Forum: Kit Building
04-06-2003, 09:25 PM
Replies: 13
Views: 1,746
Posted By thumbsup

Wing Construction - all balsa or sheeted foam?

Which wing structure can be made stronger - sheeted foam, balsa spars+ribs?
Having a hard to find rc wing structure construction techniques...internet or books! Any help?!
Forum: Aerodynamics
12-14-2002, 01:29 PM
Replies: 46
Views: 6,945
Posted By thumbsup

horizontal stabilizer dihedro

Does decalage has anything to do with angled stabilizers? :rolleyes:
Forum: Aerodynamics
11-05-2002, 09:30 PM
Replies: 120
Views: 9,737
Posted By thumbsup

Reynald's number

A comment:
I've been reading most if not all of the threads within "aerodynamics" since I found this forum...
My point is: Many read these threads. Not just the initial author. Limiting the...
Forum: O.S. Engines Support
11-01-2002, 01:25 PM
Replies: 1
Views: 520
Posted By thumbsup

Os .61fx

Does OS publish Torque x Power curves for the .61FX?

My application calls - probably - for a 13x3, 13x4 or 14x4 propeller - I'm looking for maximum thrust ;) - SAE aerodesign...

Thanks. ...
Forum: Aerodynamics
11-01-2002, 12:15 PM
Replies: 15
Views: 5,334
Posted By thumbsup

S1223 with flaps?

John,
That was good! ...Perhaps doing also the nails and hair...:))

My logic was what is called Forgetful Induction, according to a book I have... overlooking the obvious! (That data is an...
Forum: Aerodynamics
10-19-2002, 03:31 AM
Replies: 21
Views: 2,845
Posted By thumbsup

help on 727 airfoil selection

Hello friends,
Andy Lennon's RC Design, p.94, indicates that the flapped E197 @ 40degrees could achieve a Clmax of 2.2 -- unflapped, it's 1.17. If you manage to get 65% of the wing area flapped,...
Forum: Aerodynamics
10-18-2002, 02:34 AM
Replies: 15
Views: 5,334
Posted By thumbsup

S1223 with flaps?

Why 38 mph? -- Good point!
I guess the first question was: how fast can I get in 200 feet and still be able to control the airplane ? With a 12 in chord, the only controllable variable I had to...
Showing results 1 to 25 of 32
 
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