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Search: Posts Made By: WS
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Forum: Aerodynamics
11-19-2005, 09:54 PM
Replies: 1
Views: 1,057
Posted By WS

RE: Figuring neutral point on biplane

Software that supposedly computes a neutral point based on only areas and distances is NOT reliable and should not be used for that purpose. You need aspect ratios, sweep angles, downwash angles,...
Forum: Aerodynamics
09-30-2005, 01:58 PM
Replies: 16
Views: 8,746
Posted By WS

RE: Biplane Wing Incidence

When the wings are staggered, the forward wing will stall first. In this case, the top wing is set negative to the bottom wing to make them stall evenly (more aggressive). Having the forward wing...
Forum: Aerodynamics
09-21-2005, 09:02 PM
Replies: 6
Views: 1,270
Posted By WS

RE: WING LOADING APPROXIMATIONS

Trainers are usually < 20
Sport is usually 20-30

Scale depends on the airplane and the scale. But ultimately, the size of your field will determine how much real estate you have to land on...
Forum: Aerodynamics
09-20-2005, 07:18 PM
Replies: 6
Views: 991
Posted By WS

RE: Airfoil coordinates P-51D

http://www.ae.uiuc.edu/m-selig/ads/coord_database.html#P
09-18-2005, 04:57 PM
Replies: 9
Views: 894
Posted By WS

RE: Flawless maiden

Try a 14 x 10 APC. My TF Corsair went ~120 MPH with that prop on an OS 120 FS. Mind you, it's a bit smaller than the KMP, but 7 pitch would definitely seem to be the speed problem.
Forum: RC Fuels
09-15-2005, 07:18 PM
Replies: 8
Views: 1,195
Posted By WS

water in fuel

Has anyone ever tried putting the fuel in the freezer to remove water? Would this work? Methanol freezes at something like -97C and nitromethane at -29C. Would such a process cause any water to...
09-08-2005, 07:39 PM
Replies: 9
Views: 1,949
Posted By WS

RE: top flite fw190 dora

The flaps will make a far bigger difference in your landing speed than will the weight of 2 servos. Seriously, putting flaps down will be like dumping 2 pounds!
Forum: Aerodynamics
09-03-2005, 11:33 PM
Replies: 30
Views: 3,845
Posted By WS

RE: Trimming For Landing

I have attempted to teach this method to new pilots with mixed results. On one hand, it does give much better control over airspeed and more solid, consistent approaches. On the other hand, to go...
Forum: Aerodynamics
08-25-2005, 10:00 AM
Replies: 15
Views: 2,187
Posted By WS

RE: Can´t get the static margin right

As near as I can figure, at a slow flying speed of 30 MPH, you'll be getting near 55 lbs of thrust. With 15 deg AoA, that's about 5800 oz-in of nose up torque, worth about 0.4 lift coefficient on...
Forum: Aerodynamics
08-24-2005, 01:20 PM
Replies: 15
Views: 2,187
Posted By WS

RE: Can´t get the static margin right

Your AC and CG calcs are correct, but DO NOT trust that neutral point. It is based only on areas and distances. There are several factors that will move it forward.

1. The stab is operating...
Forum: Aerodynamics
08-20-2005, 11:07 PM
Replies: 5
Views: 1,088
Posted By WS

RE: Pitch up with new prop!

I believe those 16 x 4 props have wide blades? (heavier?)

Put the two props on one of those kitchen scales. A few ounzes in weight difference acting several inches from the CG could make the...
Forum: Aerodynamics
08-15-2005, 03:57 PM
Replies: 2
Views: 688
Posted By WS

RE: Help on wing design

I would say that's a very dangerous combination. You have a wing that is tapered approximately 50% and your tip airfoil will definitely not have the same maximum lift as the 44xx series, which will...
08-09-2005, 12:33 AM
Replies: 30
Views: 3,121
Posted By WS

RE: Grumman Wildcat

How many P-51 pilots earned MoH? 2
How many P-47 pilots earned MoH? 2
How many P-38 pilots earned MoH? 2
How many F4F pilots earned MoH? 8
How many F4U pilots earned MoH? 3
How many...
08-08-2005, 09:22 PM
Replies: 35
Views: 4,444
Posted By WS

RE: Top Gun B-25 Down

JR? <g, d, r>

:(
Forum: Aerodynamics
08-05-2005, 10:55 PM
Replies: 3
Views: 609
Posted By WS

RE: CG of F-16

I'm getting exactly 10 inches back from the leading edge at the root.
07-29-2005, 10:45 PM
Replies: 3,705
Views: 479,618
Posted By WS

RE: New 81" P-47 ARF coming from Hangar 9

Nice,

At 1/6 scale, the main wheels should be at least 5.5" (34" on real bird)

Scale control throws are:

Ailerons: 16 up , 12 down (80% dual rate should give scale roll rate)
...
Forum: Aerodynamics
07-22-2005, 04:13 PM
Replies: 9
Views: 1,480
Posted By WS

RE: "6-10" PITCH PROPELLERS

Zinger claims that the "variable" pitch is to counter the flex. In my experience, they are superior performing props. In two aircraft where power was marginal, these propellers made a noticeable...
Forum: Aerodynamics
07-19-2005, 09:40 PM
Replies: 6
Views: 858
Posted By WS

RE: Dihedral?

It may continue to roll in a turn, but will not have as much yaw/roll coupling.
Forum: Aerodynamics
07-17-2005, 04:27 PM
Replies: 2
Views: 637
Posted By WS

RE: Fix a Phoenix Giles G-202

lol

Have you ever read a bad review in a magazine?
Forum: Aerodynamics
07-17-2005, 12:30 AM
Replies: 5
Views: 2,104
Posted By WS

RE: airfoil max thickness position

It is angle of attack that stalls, not airspeed. You have too much elevator throw for the CG. The further back the CG is, the less movement you will need. If it's flyable as is, I would suggest...
Forum: Aerodynamics
07-01-2005, 04:22 PM
Replies: 4
Views: 655
Posted By WS

RE: Questions about wing loading and CG

The aerodynamic center would be 25% of the chord located 1/3 the semi-span toward the tip. The CG should be slightly ahead of that point for positive stability.
Forum: Aerodynamics
06-15-2005, 08:54 PM
Replies: 32
Views: 3,546
Posted By WS

RE: Tip stalls..... any fixes?

do not induce too much elevator at ANY speed. Make sure the CG is CORRECT. Even if it's specified at some point behind 25% MAC, I would still start at 25%.
Forum: Aerodynamics
06-08-2005, 08:42 PM
Replies: 5
Views: 751
Posted By WS

RE: Help with props?

thats a pretty significant drop in diameter! You'll need close to 12 pitch to keep the rpm down. Another option would be to go to 3 blades. I'm thinking a Graupner 11 x 7 3-blade might be your...
05-15-2005, 04:01 PM
Replies: 6
Views: 523
Posted By WS

RE: T F CORSAIR THROWS

Throws on the real plane are (degrees):

Ailerons: 19 up, 14 down
Elevator: 20 up, 16 down
Rudder: 25 left and right
Flaps: 50

If the plane is balanced at 25% MAC, those should...
Forum: Aerodynamics
05-14-2005, 07:32 PM
Replies: 6
Views: 965
Posted By WS

RE: Airfoils

The chord x span = area
The greater the chord for a given thickness, the greater the frontal area (and wing area)

I don't think your question is specific to airfoils, but to the whole wing?
...
Showing results 1 to 25 of 126
 


 
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