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Search: Posts Made By: LouW
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Forum: Aerodynamics
06-11-2013, 10:34 AM
Replies: 142
Views: 11,081
Posted By LouW

RE: Cambridge scientist debunks flying myth

I’ve been away from the forum for a couple of years and much to my surprise when I return, I find the same discussion going on about how a wing produces lift and arguing whether lift is a result of...
Forum: Aerodynamics
03-17-2009, 09:06 AM
Replies: 21
Views: 1,946
Posted By LouW

RE: Discussion - Scale aerodynamic characteristics

Ben, It's good to see you posting again. I haven't seen you for a while.
01-06-2009, 02:23 PM
Replies: 14
Views: 1,000
Posted By LouW

RE: 1/2 1/8a debate

During the early days of power modeling (up to the 1940’s) there were only three engine classes designated by the AMA for free flight competition. These were:

Class A up to 0.200 cubic...
Forum: Glow Engines
11-06-2008, 02:24 PM
Replies: 19
Views: 3,118
Posted By LouW

RE: Spark Ignition 2 stroke with glow fuel

When I bought my first model airplane engine (1948) they were all spark ignition since the glow plug had not been invented yet. We ran them mostly on gasoline mixed with 70 weight oil. There were...
Forum: Aerodynamics
10-30-2008, 09:50 AM
Replies: 12
Views: 1,855
Posted By LouW

RE: rudder effects

The tendency to roll with application of rudder is not due to any momentary speed difference in the wings. Instead, when rudder is applied, the tail swings to point the nose in the direction in...
Forum: Aerodynamics
08-28-2008, 09:13 AM
Replies: 12
Views: 1,962
Posted By LouW

RE: Dihedral Question

Unless you plan to do a lot of inverted, and knife edge flight, there would be no significant advantage to a flat wing. For scale like flying as well as appearance, a little dihedral will make it...
Forum: Aerodynamics
08-21-2008, 06:38 AM
Replies: 57
Views: 7,248
Posted By LouW

RE: Rudder only flight with a 4 channel trainer.

No. The ten channel was quite a bit more expensive. The ten channel was refered to as a "full house", and gave rudder, elevator ailerons, and throttle, although it still wasn't proportional. ...
Forum: Aerodynamics
08-20-2008, 08:06 AM
Replies: 57
Views: 7,248
Posted By LouW

RE: Rudder only flight with a 4 channel trainer.

You are correct that a steady state spin was not possible without elevator. However if you put the airplane in a steep spiral like you did when beginning a loop, but straightened the rudder before...
Forum: Aerodynamics
08-19-2008, 01:16 PM
Replies: 57
Views: 7,248
Posted By LouW

RE: Rudder only flight with a 4 channel trainer.

You have described most of the basics. Bear in mind that the rudder control was not proportional, but was full deflection or nothing. To further complicate matters it would deflect in one direction...
Forum: Aerodynamics
08-13-2008, 01:17 PM
Replies: 57
Views: 7,248
Posted By LouW

RE: Rudder only flight with a 4 channel trainer.

The cg of the Brigadier is located at 35% 0f the wing chord. It’s been several years since I flew it as rudder only (I added elevator after flying it RO for about a year), but I will describe how...
Forum: Aerodynamics
08-11-2008, 08:46 AM
Replies: 57
Views: 7,248
Posted By LouW

RE: Rudder only flight with a 4 channel trainer.

I got my start in the 50’s and 60’s when rudder only (with an escapement and tube type radio) was the only configuration. Loops were the most common stunt we did. Yes, you most likely need a...
Forum: Aerodynamics
06-25-2008, 08:59 AM
Replies: 10
Views: 3,247
Posted By LouW

RE: Right and down trust

The use of right and down thrust is mostly a relic from the old free flight days. Without benefit of inflight control, a fairly predictable flight profile could result from angling the thrust line. ...
Forum: Aerodynamics
05-15-2008, 06:40 AM
Replies: 6
Views: 1,100
Posted By LouW

RE: Question about rudder angles

My guess is that you are turning using rudder only. The action you describe is perfectly normal. The rudder causes the wing to bank, which causes the airplane to turn. However the wing is no...
Forum: Glow Engines
04-24-2008, 08:24 AM
Replies: 6
Views: 1,627
Posted By LouW

RE: JB Weld for mufflers

Get some aluminum screws in an appropriate size (6-33, 8-32,etc.) Drill out the existing holes with a tap drill for the size aluminum screw you want to use. Tap the hole and install an aluminum...
Forum: Aerodynamics
09-02-2007, 09:27 PM
Replies: 17
Views: 2,198
Posted By LouW

RE: How weight effects speed

The heavier plane could indeed fly at the same AOA at a higher speed, and the induced drag would be the same, but the form drag would be higher. A heavier airplane simply requires more power to...
07-13-2007, 08:31 PM
Replies: 5
Views: 825
Posted By LouW

RE: Clear dope

I’ve used dope for decades, on linen and nylon in the old days and Sig coverall in recent years. I always brush the first coat no matter how I intend to apply the remainder. Brushing lays the...
Forum: Aerodynamics
06-26-2007, 10:55 AM
Replies: 24
Views: 1,341
Posted By LouW

RE: musing

Dick,

The question doesn’t make sense. Twisting force isn’t a force at all, but a torque. A torque is the product of a force acting at a moment arm. For a given torque, the force can be...
05-31-2007, 07:43 AM
Replies: 10
Views: 1,275
Posted By LouW

RE: The new "Cox classic" engine?

I realize the picture is dim but the crankcase does appear to be a die casting with ribs. I have a drawer full of Cox engines and they all have a crankcase machined from an extrusion and not cast....
03-22-2007, 03:25 PM
Replies: 58
Views: 5,646
Posted By LouW

RE: Rudder-only aerobatic design

The parasol wing was my first radio control model. It is my own creation based loosely on plans from MAN. Power was an OK cub 19 (no throttle), and control (to use the word loosely) was a W.A.G....
03-08-2007, 08:35 AM
Replies: 47
Views: 2,974
Posted By LouW

RE: Color me dopey . . .

The airplane in the picture is a Buccaneer Jr. The kit was produced by Fresno Model Airplane Company, 4267 North Charles, Fresno, CA 937722 many years ago. It is a small verson of the original...
03-07-2007, 05:12 PM
Replies: 47
Views: 2,974
Posted By LouW

RE: Color me dopey . . .

Food coloring is water based and doesn’t mix with dope. I use an aniline dye. It is available in powder that mixes well with thinner, but the last I used is called coloring liquid and is put out...
01-17-2007, 09:16 AM
Replies: 30
Views: 4,449
Posted By LouW

RE: silkspan

Polyspan isn't the same as Koverall. Polyspan looks a lot like silkspan. It has the appearance of tissure. Koverall is a woven material like cloth. It is comparable to silk though a bit heavier....
Forum: Aerodynamics
11-22-2006, 08:41 AM
Replies: 13
Views: 2,009
Posted By LouW

RE: Ballooning Effect on a Cloud Dancer 40

All airplanes that are longitudinally stable will behave as you describe. The first step should be to check the location of the cg. The more forward the cg, the more pronounced the “ballooning”...
Forum: Aerodynamics
10-10-2006, 02:09 PM
Replies: 13
Views: 1,810
Posted By LouW

RE: Engine mounting and Aircraft Datum

It shouldn’t be a big problem to simply saw the engine bearers off flush with the firewall and put a firewall mount in the proper place. The firewall might need to be strengthened a little but...
10-07-2006, 11:57 AM
Replies: 5
Views: 1,117
Posted By LouW

RE: wing dihedral

The purpose of dihedral is to provide lateral stability. Lateral stability is the tendency of an airplane to roll away from a sideslip. In normal flying if a wing drops, the airplane will begin...
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