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Search: Posts Made By: gluedoc
Showing results 1 to 22 of 22
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Forum: Aerodynamics
04-07-2007, 01:22 PM
Replies: 299
Views: 47,873
Posted By gluedoc

RE: Suggestion for moderators

Not to be a stick in the mud, but the Cp concept is a little outmoded. While what you are saying is true (the Cp moves), mathematically, it is much easier to evaluate a wing with a Cm (a moment arm...
Forum: Composites Fabrication And Repair
11-12-2006, 09:13 AM
Replies: 20
Views: 4,579
Posted By gluedoc

RE: First Large Plug

Hoofty, hate to jump on you for this, but you are right for the wrong reason. Thermal shock is a problem in composites because the coefficients of thermal expansion are often very different for the...
Forum: Composites Fabrication And Repair
11-11-2006, 06:09 PM
Replies: 22
Views: 4,137
Posted By gluedoc

RE: Epoxy mixture?

Randy,

If David is correct, then the situation is a bit more delicate. The fundamental problem with hollow molded wings is that you don't have a lot of area to spread load over. In the case of...
Forum: Composites Fabrication And Repair
11-09-2006, 08:48 PM
Replies: 22
Views: 4,137
Posted By gluedoc

RE: Epoxy mixture?

akcaj,

Great question, there are a lot of people in this hobby that don't understand what types of epoxies do what. In general, you will find several types of "common" epoxy. Typically,...
Forum: Composites Fabrication And Repair
11-09-2006, 08:34 PM
Replies: 22
Views: 4,137
Posted By gluedoc

RE: Epoxy mixture?

Randy, I assume that this is a foam cored wing with either glass, carbon or balsa skins. I will also assume that you are talking about joining either 2 wing halves that each have a span of 25" and a...
Forum: Composites Fabrication And Repair
11-08-2006, 02:32 PM
Replies: 22
Views: 4,137
Posted By gluedoc

RE: Epoxy mixture?

I won't call myself an expert, but I do work as a professional composites engineer in aerospace. The answer to your strength question is easy, the longer the fibers, the stronger the material. ...
Forum: AMA Discussions
11-07-2006, 02:06 PM
Replies: 97
Views: 8,773
Posted By gluedoc

RE: Club no longer allows 3D or freestyle?

Our club has all types of fliers. There are some big IMAC types, a lot of sunday fliers, some helos, a bunch of electrics, and I fly powered gliders. It only works because we all communicate and...
Forum: Composites Fabrication And Repair
09-15-2006, 03:58 PM
Replies: 12
Views: 1,781
Posted By gluedoc

RE: If you could only use one composite fabric, what would it be?

As a professional aero engineer who designs with composites, I would use a mid weight glass cloth (for model building with only one fabric). Glass cloth has a smaller tow diameter than carbon, and...
Forum: Glow Engines
05-31-2006, 07:59 AM
Replies: 44
Views: 5,014
Posted By gluedoc

RE: OS engine Horsepower question (1/2 of advertised)

I haven't seen anybody say this yet, so don't get mad if I am repeating here.

The HP reported by OS is always bHP, or brake horsepower. This is the horsepower measured in a no-load condition...
Forum: RC Pattern Flying
05-19-2006, 08:30 PM
Replies: 54
Views: 10,773
Posted By gluedoc

RE: Groovy 50 3A by The World Models

BaldEagel,

You have given me hope. I have been looking for a good plane to get back into pattern after a 10 year hiatus. I have an OS 61RF with pipe that I was hoping to use. Any way you...
Forum: Composites Fabrication And Repair
11-02-2005, 12:48 PM
Replies: 21
Views: 1,517
Posted By gluedoc

RE: what is the best structure between those 2?

Sorry for all of the comments at once. Let me try to clarify a bit:

1. There is no continuity through a hole. If you cut a hole in a composite shear web, your compression strength is reduced...
Forum: Composites Fabrication And Repair
10-19-2005, 09:12 PM
Replies: 21
Views: 1,517
Posted By gluedoc

RE: what is the best structure between those 2?

In general, in composite design of torque box structure, you want to eliminate holes for lightening. Fiber reinforced composites require continuous fibers for the transfer of load across the...
Forum: Composites Fabrication And Repair
10-19-2005, 09:01 PM
Replies: 60
Views: 21,686
Posted By gluedoc

RE: Thinning Epoxy Resin

Wow, I don't read for 3 days and look what I am left with. I don't want to throw a lot more fuel on the fire, but let me just say a few things.

1. I am not the most experienced model builder...
Forum: Composites Fabrication And Repair
10-14-2005, 05:55 AM
Replies: 5
Views: 538
Posted By gluedoc

RE: Fixing a "soft" spot in a cowl.

I agree, you might actually want to slit through the first layer of glass with your #11. I would recommend slits that were in one direction only (waterline aligned), and that were no longer than ~1...
Forum: Composites Fabrication And Repair
10-13-2005, 11:56 AM
Replies: 5
Views: 538
Posted By gluedoc

RE: Fixing a "soft" spot in a cowl.

Eric,

How close to the corners of the cowl is it?

Do you have access to the area from the inside of the cowl?

Are there formers or stiffeners inside the cowl near the damage?

...
Forum: Composites Fabrication And Repair
10-13-2005, 11:41 AM
Replies: 60
Views: 21,686
Posted By gluedoc

RE: Thinning Epoxy Resin

We are way off topic here, and you all have a very adoit understanding of this, just seem to be missing a few of the details. If you leave nearly any substance exposed to humid air, it will pick up...
Forum: Composites Fabrication And Repair
10-12-2005, 03:08 PM
Replies: 14
Views: 1,962
Posted By gluedoc

RE: Here is my thread on composite fuse repair

This isn't true in the case of a sandwich repair. The outer skin of the sandwich in this case has been crippled, and is not contributing stiffness to the sandwich. In that situation, the sandwich...
Forum: Composites Fabrication And Repair
10-12-2005, 02:57 PM
Replies: 60
Views: 21,686
Posted By gluedoc

RE: Thinning Epoxy Resin

Let me provide some minor contributions here.

First, thinning epoxy resins is certainly permissible, and a very necessary thing. Usually, this is done for the purposes of spraying the epoxy...
Forum: Composites Fabrication And Repair
10-12-2005, 02:46 PM
Replies: 60
Views: 21,686
Posted By gluedoc

RE: Thinning Epoxy Resin

A minor correction Lee. Isopropyl alcohol at 99% will stay pretty close to 99% if you keep it in a sealed container. The 96% content that you are talking about is the vapor-liquid equilibrium...
Forum: Composites Fabrication And Repair
10-12-2005, 02:37 PM
Replies: 2
Views: 866
Posted By gluedoc

RE: Getting a mold from a wood plane

It is possible to make a splash tool from glass chopped strand mat and epoxy or even poly ester if you have no intention of ever heating the mold. The key would be to cover the surface of the wood...
Forum: Composites Fabrication And Repair
10-12-2005, 02:26 PM
Replies: 5
Views: 1,321
Posted By gluedoc

RE: Fuselage Layup

Three questions:

1. What thickness is your honeycomb core?
2. What density is it (pcf)?
3. Why are you using it (do you really need the stiffness of a sandwich construction)?

In most...
Forum: Questions and Answers
01-16-2004, 09:39 PM
Replies: 10
Views: 1,286
Posted By gluedoc

RE: Help with Science Fair Project - Glues

What kind of information are you looking for? Let me preface this by saying that I work in the aerospace industry, and am an adhesives engineer.

Glues (or in the parlance of professionals:...
Showing results 1 to 22 of 22


 
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