Search: Posts Made By: BMatthews
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Forum: Scratch Building, Aircraft Design, 3D/CAD 09-28-2017, 09:20 PM
Replies: 2
Views: 155
Posted By BMatthews
Off hand I would say that a 5 inch prop would not...

Off hand I would say that a 5 inch prop would not do the job. There's a bunch of reasons. In no particular order are;

The exit duct is very close to 5" in diameter so that is going to blanket...
Forum: Scratch Building, Aircraft Design, 3D/CAD 08-31-2017, 08:38 AM
Replies: 52
Views: 2,098
Posted By BMatthews
Welcome to RCU. The best tools for much...

Welcome to RCU.

The best tools for much model airplane building are simple hand tools. To that I'd add a powered hand drill. Either battery or cord. That is where I'd put the most focus for...
Forum: Aerodynamics 08-31-2017, 08:28 AM
Replies: 25
Views: 865
Posted By BMatthews
I understand that this particular T34 is a pretty...

I understand that this particular T34 is a pretty old model now from the comments earlier. Is it possible that the main gear legs have been bent back a little over the years and many dozens of...
Forum: Scratch Building, Aircraft Design, 3D/CAD 08-25-2017, 08:47 PM
Replies: 3
Views: 271
Posted By BMatthews
All the ruggedness in the world won't help you...

All the ruggedness in the world won't help you much if the model is a pig in the air. And I truly cannot see a complex material hungry SPAD as being a good trainer. Instead I see it as being...
Forum: Aerodynamics 08-25-2017, 08:39 PM
Replies: 25
Views: 865
Posted By BMatthews
I don't like trike gears for my own models. But...

I don't like trike gears for my own models. But I understand from a lot of reading about them that an abrupt takeoff is often a sign that the mains are too far behind the CG location. This makes it...
Forum: "1/2 A" & "1/8 A" airplanes 08-25-2017, 08:34 PM
Replies: 18
Views: 653
Posted By BMatthews
The swept leading edge looks all the "biz". But...

The swept leading edge looks all the "biz". But with the length of the nose you show it could be an issue with the CG placement. I'm thinking it would need tail weight where the swept forward...
Forum: Scratch Building, Aircraft Design, 3D/CAD 07-31-2017, 07:17 AM
Replies: 256
Views: 31,694
Posted By BMatthews
A truly wonderful finish to a long build. I...

A truly wonderful finish to a long build. I don't blame you for the nerves hitting you at the end of the flight ! ! ! ! :D It sure does look great in the air.
Forum: RC Gliders, Sailplanes and Slope Soaring 06-21-2017, 09:22 AM
Replies: 15
Views: 842
Posted By BMatthews
You asked about a double size Wanderer. ...

You asked about a double size Wanderer. Something to ponder over a 12 foot span wing is that the loads on it are going to scale up a lot. And the rib spacing and open style construction that relies...
Forum: Scratch Building, Aircraft Design, 3D/CAD 06-16-2017, 08:17 PM
Replies: 31
Views: 1,816
Posted By BMatthews
The thing is when folks like that say to round...

The thing is when folks like that say to round the edge they mean the outer edges exposed to the airflow. But down in the middle of things away from the air flow you still want the hinge line to...
Forum: RC Gliders, Sailplanes and Slope Soaring 06-16-2017, 08:07 PM
Replies: 15
Views: 842
Posted By BMatthews
Nothing wrong with working with a proven tail...

Nothing wrong with working with a proven tail area sizing as found on the Wanderer. But it's not as simple as looking at the top and side views of the tail areas. You may want to look at this
...
Forum: Aerodynamics 06-16-2017, 08:02 PM
Replies: 15
Views: 2,115
Posted By BMatthews
Uh, guys, necropost resurrection....

Uh, guys, necropost resurrection....
Forum: Scratch Building, Aircraft Design, 3D/CAD 06-11-2017, 08:50 AM
Replies: 31
Views: 1,816
Posted By BMatthews
A note for next time. The nose of the movable...

A note for next time. The nose of the movable surfaces should be more of a ">" shape instead of a "C" shape. When you round it too much you risk the nose coming into contact with the other surface...
Forum: Scratch Building, Aircraft Design, 3D/CAD 06-11-2017, 08:37 AM
Replies: 6
Views: 361
Posted By BMatthews
I also recommend some manner of balsa stripper or...

I also recommend some manner of balsa stripper or even slice your own from sheet stock. Buying smaller sizes of strip wood such as you will need for a Pat Trittle design is not only costly but often...
Forum: Aerodynamics 04-23-2017, 12:13 PM
Replies: 10
Views: 1,048
Posted By BMatthews
When the model first lifted off it got enough...

When the model first lifted off it got enough speed to raise the nose that high but apparently didn't have enough power to maintain speed at that high a climb angle.. And being fairly new to models...
Forum: Free Flight 04-20-2017, 09:41 AM
Replies: 3
Views: 2,164
Posted By BMatthews
It's got a radio in it so that makes it radio...

It's got a radio in it so that makes it radio controlled. DLG refers to the method for launching, not the presence or not of radio control.

There are folks building and flying a new breed of...
Forum: Aerodynamics 04-17-2017, 12:22 PM
Replies: 10
Views: 551
Posted By BMatthews
I guess it depends on your idea of "tail heavy". ...

I guess it depends on your idea of "tail heavy". Some of that also depends on the type and role of the model.

For most sport flyers we tend to like the CG back close to but not quite at the...
Forum: Aerodynamics 04-17-2017, 10:54 AM
Replies: 174
Views: 14,370
Posted By BMatthews
80%.... amazing. And from the sounds of it...

80%.... amazing. And from the sounds of it perhaps still too far forward if it's responding strongly to added throttle. I know it hasn't had a lot of air time but do you have a feel for how it...
Forum: Aerodynamics 04-17-2017, 10:47 AM
Replies: 10
Views: 551
Posted By BMatthews
This is true. There is no doubt that the models...

This is true. There is no doubt that the models become more sensitive to the elevator as the balance point is shifted back within the allowed range. But that's easily dealt with by altering the...
Forum: Aerodynamics 04-10-2017, 01:02 PM
Replies: 174
Views: 14,370
Posted By BMatthews
https://www.youtube.com/watch?v=I-3_cXuiNQM ...

https://www.youtube.com/watch?v=I-3_cXuiNQM

Sal, I lost track of this thread and just got caught up on it. A heartfelt congratulations on all you've done with the Illya Muromets both at the...
Forum: "1/2 A" & "1/8 A" airplanes 04-05-2017, 10:37 AM
Replies: 13
Views: 909
Posted By BMatthews
I think you hit the nail on the head with the...

I think you hit the nail on the head with the idea of a dynamic seal while running. And in truth when I think back on my reedie days I thought the same thing. But it has been a while.
Forum: Aerodynamics 04-05-2017, 10:31 AM
Replies: 10
Views: 551
Posted By BMatthews
I expect it also tries to climb strongly when you...

I expect it also tries to climb strongly when you add throttle too. At least it would try to do so unless you are using a serious amount of downthrust.

The "cure" is to move the CG back and...
Forum: "1/2 A" & "1/8 A" airplanes 03-31-2017, 10:33 PM
Replies: 13
Views: 909
Posted By BMatthews
MJD, I don't think those numbers are bad at all...

MJD, I don't think those numbers are bad at all for what you've got. The reed is a big limiter on these things. The TeeDee cylinder is helping because I believe that you're up over what a "product"...
Forum: Scratch Building, Aircraft Design, 3D/CAD 03-30-2017, 09:59 AM
Replies: 15
Views: 647
Posted By BMatthews
As it happens I've got a couple of HySol kits...

As it happens I've got a couple of HySol kits here. It's a "filled" epoxy sort of like JBWeld. But the fillers it uses to achieve some degree of thickness are straight powder fillers and thus the...
Forum: Scratch Building, Aircraft Design, 3D/CAD 03-30-2017, 09:53 AM
Replies: 22
Views: 1,470
Posted By BMatthews
I love the beautiful and lightweight structures...

I love the beautiful and lightweight structures you are using. This promises to be a great flying scale model.
Forum: Aerodynamics 03-30-2017, 09:47 AM
Replies: 7
Views: 457
Posted By BMatthews
The need for downthrust plays hand in hand with...

The need for downthrust plays hand in hand with the CG position and final elevator trim. Dan up above is getting away with the 0-0-0 setup because he's comfortable with his models flying like...
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