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Search: Posts Made By: edsplane
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Forum: Aerodynamics
05-11-2013, 05:13 AM
Replies: 13
Views: 3,640
Posted By edsplane

RE: Rounding Stabilizer Leading Edge

There is a good reason why an airplane's leading edges are rounded. If the stab leading edge is square, the drag of the stab is higher and the air flow around that stab will be turbulent. The result...
Forum: Aerodynamics
04-30-2013, 04:19 AM
Replies: 12
Views: 1,846
Posted By edsplane

RE: how does steerable nose wheel affect aerodynamics?

The nosewheel acts as another rudder, though not as powerful as the main rudder. All airplanes rotate(in yaw) about the aerodynamic center, also known as the neutral point, which is around 25 - 30%...
Forum: Aerodynamics
02-25-2013, 06:05 AM
Replies: 4
Views: 1,075
Posted By edsplane

RE: CG Calculation Differences

If you want to determine the CG accurately for any kind of wing, go to the www.rcaeronauts.com website and get a good idea of the factors involved. The proposed method includes Sutherlands...
Forum: Aerodynamics
01-07-2013, 05:10 AM
Replies: 9
Views: 1,190
Posted By edsplane

RE: cubic versus pounds per square foot ? Differences ?

Do you consider other factors in scaling a model plane to a different size, such as Power Loading, ie. Weight in ounces, divided by engine displacement in cubic inches? Are there any other important...
Forum: Aerodynamics
12-24-2012, 07:01 AM
Replies: 15
Views: 2,063
Posted By edsplane

RE: How to determine CG ??

If you just want to do some sport flying, locating the CG on the wing spar is a good place to start. The spar on most planes, is located at about the 25% of MAC point, which gives a 10% static...
Forum: Aerodynamics
11-08-2012, 04:47 AM
Replies: 29
Views: 4,032
Posted By edsplane

RE: tail heavy wants to roll?

I don't think that the CG location is too far aft or affecting the roll stability. You shouldn't see a large cross-coupling between pitch and roll, in a conventional airplane. You may have a problem...
Forum: Aerodynamics
10-05-2012, 04:11 AM
Replies: 20
Views: 6,893
Posted By edsplane

RE: Scaling down aircraft

The Wing Volume Loading, also referred to as Wing Cube Loading, is touted in some of the literature as an ideal factor for scaling airplanes and was originally defined by Francis Reynolds in an...
Forum: Aerodynamics
10-04-2012, 04:00 AM
Replies: 20
Views: 6,893
Posted By edsplane

RE: Scaling down aircraft

If you want to scale a plane up or down and have it fly similar to the original design, make sure that the wing loading and power loading match the original design. The wing loading is the total...
Forum: Aerodynamics
09-26-2012, 07:08 AM
Replies: 15
Views: 2,356
Posted By edsplane

RE: Ailerons not straight

The ailerons are meant to change the camber equally and opposite for the wing halves, so that your rolling moment is uniform. If the right aireron has a different rolling moment than the left, with...
Forum: Aerodynamics
08-01-2012, 04:43 AM
Replies: 5
Views: 6,548
Posted By edsplane

RE: CG On flying wing?

The links suggested in this discussion give some good info about conventional airplanes, ie. with tails, but the flying wing is a special case. Normally, the horizontal tail(HTail) influences the...
Forum: Aerodynamics
07-31-2012, 03:55 AM
Replies: 5
Views: 6,548
Posted By edsplane

RE: CG On flying wing?

The calculator used in the previous message, is limited to a single-panel wing and does not include the effects of the wing tips. If your flying wing is similar to this simple configuration, the...
Forum: Aerodynamics
07-15-2012, 05:34 AM
Replies: 12
Views: 2,076
Posted By edsplane

RE: New CG application that does multi-panels

Hi Gerry, I certainly agree that finding the neutral point first is the way to go and also setting the CG initially at a conservative 20% or so.<div>In this way, you can tell how much static margin...
Forum: Aerodynamics
07-10-2012, 07:20 AM
Replies: 7
Views: 1,163
Posted By edsplane

RE: CRAZY YAK 100

From your original  description of the problem, it sounds like the CG is too far aft. I wouldn't deviate from the manufacturer's specs for incidence and thrust line until the CG is located correctly....
Forum: Aerodynamics
07-09-2012, 05:06 AM
Replies: 12
Views: 2,076
Posted By edsplane

RE: New CG application that does multi-panels

I don't know what you're using for these calculations, but, just because something is in the calculations, doesn't mean that it is correct. I suggest that you get the best possible set of equations...
Forum: Aerodynamics
07-04-2012, 04:37 AM
Replies: 7
Views: 1,077
Posted By edsplane

RE: Figuring wing loading

R8893 is absolutely correct. The ailerons are always included in the wing area, as is the portion of the wing that's covered by the fuselage.<div>
</div><div>  Also, in case you don't have this, a...
Forum: Aerodynamics
07-02-2012, 07:07 AM
Replies: 12
Views: 2,076
Posted By edsplane

RE: New CG application that does multi-panels

I have tried a 4-panel example using the referenced CG calculator and find that the answers it gives, don't agree with my hand calculations. One reason is that the wing tips are ignored. Another is...
Forum: Aerodynamics
06-25-2012, 08:40 AM
Replies: 4
Views: 1,655
Posted By edsplane

RE: Aerfoil data - drag and lift coefficients

I have a copy of a report that gives the x,y coordinates to plot a Clark Y airfoil. It also has the lift coefficient vs Angle of Attack which you probably want and lift and drag coefficients at...
Forum: Aerodynamics
06-20-2012, 01:44 PM
Replies: 36
Views: 3,544
Posted By edsplane

RE: Beginner question regarding CG

The calculator you referenced, and others I've seen, do not handle wings with more than one panel. Aside from the Trainers, most of the model aircraft are really 2 or 3 panel airplanes. Treating them...
Forum: Aerodynamics
06-20-2012, 04:47 AM
Replies: 36
Views: 3,544
Posted By edsplane

RE: Beginner question regarding CG

You will find a good discussion on CG location at www.rcaeronauts.com.

You should know that the CG must be located forward of the Neutral Point. The farther forward of the NP, the more stable the...
Forum: Aerodynamics
06-20-2012, 04:31 AM
Replies: 57
Views: 41,187
Posted By edsplane

RE: Complex shape flying wing/delta CG calculator

HI Mike. Please do not "simplify" the drawing of your complex wing. You will only build more errors into your CG calculations.

There is a small program that is available, to do exactly what you...
Forum: Aerodynamics
06-18-2012, 03:43 AM
Replies: 5
Views: 1,150
Posted By edsplane

RE: CG on a Royal Kit

No matter what plane you have, it is easy to locate the CG. All the information you need is on www.rcaeronauts . You can accurately locate the CG and NP for any single- or multi-panel conventional...
Forum: Aerodynamics
06-17-2012, 06:56 AM
Replies: 20
Views: 4,578
Posted By edsplane

RE: CG location when fuel is burned

Hey Guys, Let's try this a different way; forget the moment arms for now.

The balance point for the airplane is, by definition, where the CG is located. If you put the CG of the fuel tank at the...
Forum: Aerodynamics
06-16-2012, 06:56 AM
Replies: 20
Views: 4,578
Posted By edsplane

RE: CG location when fuel is burned

There is no contradiction. What you say is absolutely true. It is customary to calculate the CG location with the tank empty, I think because you want the plane to be stable when you are ready to...
Forum: Aerodynamics
05-11-2012, 11:42 AM
Replies: 36
Views: 3,544
Posted By edsplane

RE: Beginner question regarding CG

Hi, I think that the advice you've been given above, is good as far as it goes. You can learn more on my website www.rcaeronauts.com (http://www.rcaeronauts.com) , sinceit goesinto the location of CG...
Forum: Seaplanes
04-24-2012, 08:01 AM
Replies: 10
Views: 1,792
Posted By edsplane

RE: great planes floats question please:

Here's my opinion. Always cover the floats with either fiberglass, silk or similar fabric, painted with fuel-proofed dope or really thinnedepoxy paint. Covering them with film over bare wood, is...
Showing results 1 to 25 of 25


 
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