Search: Posts Made By: BMatthews
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Forum: Aerodynamics Yesterday, 02:19 PM
Replies: 6
Views: 119
Posted By BMatthews
What an intriguing design! ! ! ! For a...

What an intriguing design! ! ! !

For a model of that size span and area there's no point in going crazy with fancy options. The small wing chord will make shaping of a really critical airfoil...
Forum: Aerodynamics 02-20-2018, 01:00 PM
Replies: 2
Views: 55
Posted By BMatthews
Full size planes use the inverted airfoil where...

Full size planes use the inverted airfoil where they need a lot of pitching authority. But the full size planes tend to run more forward and stronger pitch stability CG locations. On our models we...
Forum: Aerodynamics 02-20-2018, 12:25 PM
Replies: 6
Views: 119
Posted By BMatthews
The size and expected flying speed will also play...

The size and expected flying speed will also play a part in your airfoil decision. Also the structure you will use for spars inside and what you're using for a skin over top of the foam if any. So...
Forum: Scratch Building, Aircraft Design, 3D/CAD 02-15-2018, 01:11 AM
Replies: 14
Views: 229
Posted By BMatthews
A local tool store Lee Valley has the same set of...

A local tool store Lee Valley has the same set of wheel tools. But it's good to compare. And I was wondering if builder's line chalk would work and it seems from the reference in the Micromark link...
Forum: RC Gliders, Sailplanes and Slope Soaring 02-15-2018, 01:05 AM
Replies: 3
Views: 271
Posted By BMatthews
You might want to try a search on the Albatross...

You might want to try a search on the Albatross name over at "that other model site" RC Groups. There's a really good build thread from a couple of years ago by someone that built one.

The big...
Forum: Scratch Building, Aircraft Design, 3D/CAD 02-14-2018, 09:59 AM
Replies: 14
Views: 229
Posted By BMatthews
No, I don't use a pounce wheel tool. Although I...

No, I don't use a pounce wheel tool. Although I did have that idea a few years back. It so happened that I pulled apart an old printer to scavenge parts and there were little pinwheels in it as...
Forum: RC Gliders, Sailplanes and Slope Soaring 02-14-2018, 09:43 AM
Replies: 3
Views: 271
Posted By BMatthews
To fly it in any manner with RC you will need to...

To fly it in any manner with RC you will need to pretty well re-design the structure to beef things up. For starters you will need to modify the wings for a tried and true spar setup that will...
Forum: Scratch Building, Aircraft Design, 3D/CAD 02-13-2018, 05:05 PM
Replies: 2
Views: 76
Posted By BMatthews
I know how we can become attached to some...

I know how we can become attached to some designs. But if you're looking for light and floaty how about an old timer free flight adapted to full house RC? Lots of fun to build and they certainly...
Forum: Scratch Building, Aircraft Design, 3D/CAD 02-13-2018, 05:00 PM
Replies: 14
Views: 229
Posted By BMatthews
I searched on and off for a bunch of years before...

I searched on and off for a bunch of years before I found a pack of new carbon paper. I was overjoyed at it... .until I found that it was so "dry" that I had to press hard enough to get any amount of...
Forum: Aerodynamics 01-06-2018, 11:10 AM
Replies: 11
Views: 548
Posted By BMatthews
I'm late to the party but I tend to agree with...

I'm late to the party but I tend to agree with USTik on alll points to some degree or other.

It's clearly intended to be a fairly sporty model and one which would be flown upside down much of the...
Forum: Aerodynamics 01-06-2018, 10:37 AM
Replies: 9
Views: 559
Posted By BMatthews
For a pylon mounted sea plane I'm a little...

For a pylon mounted sea plane I'm a little surprised it does not use some up thrust on the engine. A little upthrust aids with combating the nose down pitching tendency with power that high above...
Forum: Beginners 01-06-2018, 10:31 AM
Replies: 5
Views: 395
Posted By BMatthews
Welcome to RCU. Aerodynamics was not the proper...

Welcome to RCU. Aerodynamics was not the proper place to put your question so it's here now.

Host your picture on some other site like Facebook or one of the image hosting services and put a...
Forum: Scratch Building, Aircraft Design, 3D/CAD 11-06-2017, 05:48 PM
Replies: 9
Views: 314
Posted By BMatthews
Nylon is known to absorb and give up moisture...

Nylon is known to absorb and give up moisture from the air much like wood does. So you may be seeing the results of this. And as it takes on and gives up moisture it can move size well enough to...
Forum: Aerodynamics 11-06-2017, 05:41 PM
Replies: 15
Views: 1,381
Posted By BMatthews
Jeffee, if this reply is not too late for you I...

Jeffee, if this reply is not too late for you I would suggest that with a complex multi surface design of that sort that you make up an all balsa or all thin foam test glider and play around with the...
Forum: Aerodynamics 11-06-2017, 05:28 PM
Replies: 8
Views: 566
Posted By BMatthews
If the ailerons are full span "strip ailerons"...

If the ailerons are full span "strip ailerons" then you have changed the shape of the airfoil for the whole wing. But since you mention the "central part of the wing..." I'm assuming that they are...
Forum: Scratch Building, Aircraft Design, 3D/CAD 09-28-2017, 09:20 PM
Replies: 2
Views: 272
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: 2,325
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: 1,112
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: 357
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: 1,112
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: 843
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: 32,245
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: 911
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: 1,988
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: 911
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
...
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