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Search: Posts Made By: BMatthews
Showing results 1 to 25 of 500
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01-09-2021, 10:53 PM
Replies: 9
Views: 1,440
Posted By BMatthews

Now THAT is impressive ! ! ! ! What...

Now THAT is impressive ! ! ! !

What engines will your buddy be using for powering this beast?
01-09-2021, 10:48 PM
Replies: 2
Views: 809
Posted By BMatthews

First off Welcome back to building and flying and...

First off Welcome back to building and flying and Welcome to RCU.

If you want to fly RET at first then you NEED dihedral. The way the model rolls into and out of the turns when flying with rudder...
01-09-2021, 10:33 PM
Replies: 9
Views: 862
Posted By BMatthews

Rick, if you're still reading in on this the...

Rick, if you're still reading in on this the servos you have would be fine for a lot of 1/2A designs.

By now you might be figuring out that it's all about how fast the model is flying and how big...
Forum: Aerodynamics
12-24-2020, 04:22 PM
Replies: 6
Views: 2,057
Posted By BMatthews

Airfoiltools has a Rn calculator you can use to...

Airfoiltools has a Rn calculator you can use to get a feel for the range that a model of a set speed range and size might encounter.

Reynolds number calculator (airfoiltools.com)...
12-23-2020, 10:27 PM
Replies: 2
Views: 1,531
Posted By BMatthews

Odoaker sent me a picture of the glider to go...

Odoaker sent me a picture of the glider to go with the description above.
...
Forum: Aerodynamics
12-22-2020, 01:26 AM
Replies: 2
Views: 782
Posted By BMatthews

Objects in front of the prop tends to reduce...

Objects in front of the prop tends to reduce their effectiveness. Props work best when they see clear air free from turbulence that occurs from parts of the model. So I vote for normal tractor use.
...
12-22-2020, 01:03 AM
Replies: 42
Views: 2,480
Posted By BMatthews

And what is wrong with that? I think it...

And what is wrong with that?

I think it has a strong Buck Rogers look to it. And that means it looks awesome!

Be a while before the first flights I'm thinking?
11-18-2020, 04:38 PM
Replies: 25
Views: 4,173
Posted By BMatthews

Yep, the polyurethane glue is available from lots...

Yep, the polyurethane glue is available from lots of name brands now. Gorrila was only one of the first. Or perhaps just the one that advertised the most. It's far from the only one.
11-17-2020, 10:44 PM
Replies: 25
Views: 4,173
Posted By BMatthews

I'm not at all surprised. Back when I dabbled...

I'm not at all surprised. Back when I dabbled with foam wings and vacuum bagging I found that for thin skins that the foam beads would start to sink in and the "glue" between the beads would create...
11-17-2020, 10:32 PM
Replies: 8
Views: 1,896
Posted By BMatthews

Calmo you can get pretty decent casual climbing...

Calmo you can get pretty decent casual climbing performance by setting up your model with around 60 to 70 watts per lb of model. This will give it around a 45 to 50 climb at a decent but not racy...
Forum: Aerodynamics
10-22-2020, 12:09 PM
Replies: 6
Views: 1,092
Posted By BMatthews

Wait... We don't normally consider the thrust...

Wait... We don't normally consider the thrust line to the stab. You'd want to compare the thrust line to the wing airfoil's center line. And then compare the wing's center line to the stabilizer...
10-21-2020, 02:47 PM
Replies: 2
Views: 1,954
Posted By BMatthews

You're likely flying through turbulence related...

You're likely flying through turbulence related to thermals or rotors from features on the ground. But either way what the glider is doing is totally normal depending on what the turbulence does...
09-22-2020, 07:28 PM
Replies: 6
Views: 1,305
Posted By BMatthews

Another option would be to cut through from one...

Another option would be to cut through from one side or the other and "flex" it straight. Either wedging open the cut or closing up the cut. When the tail post is back on the center line rig a...
08-07-2020, 09:13 PM
Replies: 3
Views: 784
Posted By BMatthews

Don't look a gift horse in the mouth. List...

Don't look a gift horse in the mouth. List something for sale QUICK ! ! ! :D

You say you are working from a semi kit. The fellow that did the CAD to make up the cut file for the kit might have...
07-29-2020, 09:33 AM
Replies: 3
Views: 725
Posted By BMatthews

Aluminium is a bit tougher to do and in that case...

Aluminium is a bit tougher to do and in that case you may want to involve a local fabrication shop. Note that it's not just any old aluminium that you need. You want to use one of the heat treated...
07-28-2020, 08:27 AM
Replies: 3
Views: 725
Posted By BMatthews

Why? You can make or buy fairly basic and cheap...

Why? You can make or buy fairly basic and cheap tools which will allow you to bend up to 1/4" music wire. And you can buy them for a lot less than it would cost to get even one such landing gear...
07-28-2020, 08:24 AM
Replies: 29
Views: 2,383
Posted By BMatthews

What is this tube set intended to be used for? ...

What is this tube set intended to be used for?

Plus you realize that you only need 8 inches or so for the joint, right? The outer tube is also only to act as a slip tube and to give you...
07-27-2020, 01:38 PM
Replies: 29
Views: 2,383
Posted By BMatthews

You can use a wood joiner but if you do you would...

You can use a wood joiner but if you do you would want to wrap the box formed by the upper and lower spar caps with kevlar thread to withstand the scissors like shear forces at work. And if you do...
07-27-2020, 08:29 AM
Replies: 10
Views: 852
Posted By BMatthews

Part of the idea of two servos is that they each...

Part of the idea of two servos is that they each push the one side. On a precision pattern model this is important because you can ensure the surfaces are matched exactly. On a Robin Hood this...
Forum: Aerodynamics
07-26-2020, 04:27 PM
Replies: 45
Views: 5,022
Posted By BMatthews

Yeah, you're certainly right that this can be an...

Yeah, you're certainly right that this can be an issue. And it may well be what is happening. The issue we're fighting is that we weren't there to see what happened.

And ya, flick and snap to me...
07-26-2020, 09:15 AM
Replies: 29
Views: 2,383
Posted By BMatthews

In that case I would suggest looking at wing tube...

In that case I would suggest looking at wing tube setups as used on RC gliders. Namely the right way is to house the liner tubes in the middle of the spar between the upper and lower spar caps. ...
Forum: Aerodynamics
07-26-2020, 09:11 AM
Replies: 45
Views: 5,022
Posted By BMatthews

I'm guessing that he may be confusing a "flick"...

I'm guessing that he may be confusing a "flick" with an inverted stall with wing fall off. Hard to say for sure without a video or being there.

I've never seen a situation where a model stalled...
07-24-2020, 09:09 PM
Replies: 7
Views: 777
Posted By BMatthews

I can't find the plans for the 99 inch but the...

I can't find the plans for the 99 inch but the little .10 powered version uses fairly normal looking top and bottom caps with webbing in between.

Can you take a picture of the wing section and...
07-24-2020, 09:04 PM
Replies: 29
Views: 2,383
Posted By BMatthews

Conversion for something like this is best done...

Conversion for something like this is best done during the initial build. Are you getting ready to build or is it built already? Cutting the built wing apart and adding the joiners is certainly...
Forum: Aerodynamics
07-24-2020, 08:56 PM
Replies: 45
Views: 5,022
Posted By BMatthews

Cutarug, I'm thinking that jester is right and...

Cutarug, I'm thinking that jester is right and it's falling out of the loop due to insufficient speed. What's happening is that as you go over the top it stops pulling outward and the G load on the...
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