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Search: Posts Made By: BMatthews
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06-18-2021, 11:10 AM
Replies: 1
Views: 531
Posted By BMatthews

Xeroml welcome to RC Universe! You might...

Xeroml welcome to RC Universe!

You might have forgotten to add a little angle between the wing and tail. The tail needs to be at a slight negative angle compared to the wing so that it will trim...
06-10-2021, 11:06 PM
Replies: 2
Views: 725
Posted By BMatthews

The only reason your field would not be...

The only reason your field would not be supportive for learning to thermal soar is if it has a LOT of plane eating trees around it. And if that is the case there would already be a pretty good...
06-09-2021, 12:03 PM
Replies: 3
Views: 718
Posted By BMatthews

You need to keep the wood in the steam or in...

You need to keep the wood in the steam or in lightly boiling water for about 20 minutes. Then it should bend more easily.

Perhaps with your altitude the water or steam is not hot enough? If that...
06-08-2021, 12:44 PM
Replies: 3
Views: 574
Posted By BMatthews

Critx, consider that most, if not all, of today's...

Critx, consider that most, if not all, of today's model size turbojets use centrifugal compressors. But then consider the RPM needed to make them work. Keep that in mind when looking at motors to...
06-08-2021, 12:27 PM
Replies: 10
Views: 1,044
Posted By BMatthews

Yeah, you'll need a bladder or pacifier tank to...

Yeah, you'll need a bladder or pacifier tank to give you the pressure needed to ensure an even run over more than a couple of inches and for when using more than around a half oz. Even the bigger...
Forum: Aerodynamics
06-08-2021, 12:17 PM
Replies: 3
Views: 813
Posted By BMatthews

Vertical speed? But even there I'd expect the...

Vertical speed? But even there I'd expect the GPS based idea to provide both ground and vertical speeds.
Forum: Aerodynamics
06-08-2021, 12:16 PM
Replies: 3
Views: 619
Posted By BMatthews

The folks that fly the flat foam flippy flyer...

The folks that fly the flat foam flippy flyer models typically run them with the CG a little behind the Neutral Point. It helps them for doing hovering maneuvers.

As for doing this on a model I...
04-03-2021, 10:55 PM
Replies: 5
Views: 3,066
Posted By BMatthews

It certainly look like it will be right at home...

It certainly look like it will be right at home after you push it over a bluff into some good slope lift. It's certainly not a thermal sailplane. But in the right sort of strong slope lift I'll bet...
04-03-2021, 10:52 PM
Replies: 2
Views: 2,247
Posted By BMatthews

In slope soaring in medium to higher winds where...

In slope soaring in medium to higher winds where you'll likely be doing aerobatics where the servos are moving more often than they are still you'll use up power a lot faster you'll want higher...
03-15-2021, 06:39 PM
Replies: 5
Views: 1,347
Posted By BMatthews

That is true... It's important to keep the...

That is true... It's important to keep the proper CG or what's the point of it all?
03-08-2021, 05:37 PM
Replies: 5
Views: 1,347
Posted By BMatthews

I like the motor suggestion but to allow for a...

I like the motor suggestion but to allow for a couple or three climbs and still have a good reserve power I think I'd want more like a 1500mah 3S pack for this big and heavy a model.

The website...
01-09-2021, 10:53 PM
Replies: 13
Views: 3,736
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: 1,513
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: 11
Views: 2,115
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: 2,758
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: 1,946
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: 1,321
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: 3,590
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: 27
Views: 5,739
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: 27
Views: 5,739
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: 2,466
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: 1,658
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: 2,166
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: 1,455
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: 1,050
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...
Showing results 1 to 25 of 500
 


 
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