Search: Posts Made By: BMatthews
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10-20-2019, 02:14 PM
Replies: 7
Views: 829
Posted By BMatthews

Here ya go.... ...

Here ya go....
https://outerzone.co.uk/plan_details.asp?ID=1376
10-10-2019, 10:31 AM
Replies: 8
Views: 878
Posted By BMatthews

For smaller size like this to maintain good lower...

For smaller size like this to maintain good lower speed manners you need to keep the model quite light. Add to this that the lifting surfaces of a canard cannot be pushed to as high a coefficient of...
09-23-2019, 12:24 PM
Replies: 8
Views: 878
Posted By BMatthews

For flying I STRONGLY suggest skipping the swept...

For flying I STRONGLY suggest skipping the swept blade props. By all means make some "scale props" for static display. But stick to commercial props for actually flying. As you say you don't have...
Forum: Aerodynamics
07-12-2019, 03:37 PM
Replies: 2
Views: 416
Posted By BMatthews

Higher Kv value will pull more current. Lower Kv...

Higher Kv value will pull more current. Lower Kv will pull less. So that prop can actually be used on a wide range of motor Kv values. A little low Kv value Park 450 with a Kv of 980 for example...
Forum: Aerodynamics
04-02-2019, 11:20 PM
Replies: 4
Views: 737
Posted By BMatthews

Sifez, Welcome Aboard. Lnewqban is right,...

Sifez, Welcome Aboard.

Lnewqban is right, it's tough to really tell much. But the numbers do seem decent enough. Especially if you can meet the 35oz total flying weight with the 60 inch span. ...
Forum: Aerodynamics
04-02-2019, 11:09 PM
Replies: 2
Views: 684
Posted By BMatthews

Cyclops, since the Vulcan is basically a flying...

Cyclops, since the Vulcan is basically a flying wing you'll both want and need to use a wing airfoil with some reflex rather than a flat bottom wing with a strong camber value. That wing airfoil...
03-13-2019, 09:14 AM
Replies: 5
Views: 358
Posted By BMatthews

Smoky, the washout is a better idea than relying...

Smoky, the washout is a better idea than relying on aileron reflex. While it's true that reflexing the surfaces reduces the angle of incidence compared to the inner portion it also alters the...
03-13-2019, 08:58 AM
Replies: 4
Views: 317
Posted By BMatthews

This trick of blocking up the wing and sanding...

This trick of blocking up the wing and sanding the face works easier if you can set the wing's root face right at the edge of the bench and using a large sanding block work with pressure against the...
03-12-2019, 09:15 PM
Replies: 8
Views: 950
Posted By BMatthews

Where do you get the idea that an asymmetric...

Where do you get the idea that an asymmetric design is MORE stable than a symmetric one? Just because Rutan and B&V have made a few doesn't mean that there's no non symmetric traits to flying them....
01-27-2019, 12:28 PM
Replies: 5
Views: 388
Posted By BMatthews

The Guillow's Corsair will be a fast plane with...

The Guillow's Corsair will be a fast plane with that sort of power. So while the single dowel and single screw will do fine you'll want to ensure a couple of things. First off is make the dowel...
Forum: Aerodynamics
01-27-2019, 12:18 PM
Replies: 12
Views: 950
Posted By BMatthews

Which is more often referred to as G load acting...

Which is more often referred to as G load acting on the wing's or other object's mass. Again inertia isn't a great term to use for this. Inertia is more often used in association with an object's...
Forum: Aerodynamics
01-27-2019, 12:10 PM
Replies: 6
Views: 865
Posted By BMatthews

The need or not is related to the location of the...

The need or not is related to the location of the thrust line to the wing, which is a major portion of the drag on any airplane. It is also related to the amount of pitch stability trimmed into the...
Forum: Aerodynamics
01-02-2019, 12:54 PM
Replies: 12
Views: 950
Posted By BMatthews

I don't get that magazine so have not read the...

I don't get that magazine so have not read the article. But the diagrams showing the wing's lift acting against the wing's inertia is rather odd. For static conditions everyone else labels those...
Forum: Aerodynamics
12-31-2018, 11:40 AM
Replies: 12
Views: 950
Posted By BMatthews

I haven't read that article but the way you wrote...

I haven't read that article but the way you wrote your part of the post in quotes doesn't make sense. The inertia of the wing is not directly related to the lift of the wing. And it's not accurate to...
12-19-2018, 12:21 PM
Replies: 5
Views: 345
Posted By BMatthews

Wire is heavy and unless you use music wire it's...

Wire is heavy and unless you use music wire it's not springy so it'll bend and stay bent. Instead I'd suggest two or three round carbon rods sized that you can push them through the corrugations...
12-19-2018, 12:17 PM
Replies: 19
Views: 1,599
Posted By BMatthews

Great to read that the testing went well.

Great to read that the testing went well.
12-18-2018, 12:38 PM
Replies: 6
Views: 429
Posted By BMatthews

Most of us these days just figure out some way to...

Most of us these days just figure out some way to print the stuff using tile printing and tape the sheets together.
12-18-2018, 12:37 PM
Replies: 2
Views: 402
Posted By BMatthews

Either way it'll cause more drag than lift. More...

Either way it'll cause more drag than lift. More on the bottom than on top. On a flat plate like this the air over the top becomes highly turbulent at very small angles of attack. So unless the...
Forum: Aerodynamics
12-06-2018, 10:12 AM
Replies: 20
Views: 769
Posted By BMatthews

The need for a landing roll of some 30 feet in...

The need for a landing roll of some 30 feet in contact with the ground will certainly be a game changer. And it does point towards the idea of using trike gear.

You'll want to set up the model...
11-23-2018, 01:33 PM
Replies: 1
Views: 238
Posted By BMatthews

Sorry for the imperial measurements but it's what...

Sorry for the imperial measurements but it's what I know from experience....

For a non glider style airplane it takes roughly 13 to 15 watts per lb of model to fly level at a moderately slow...
Forum: Aerodynamics
11-23-2018, 01:08 PM
Replies: 20
Views: 769
Posted By BMatthews

Lots of T&G's in a short time was one of the old...

Lots of T&G's in a short time was one of the old fun fly model events. Really thick full symmetrical airfoils and really wide ailerons. Sometimes set up as flaperons or perhaps spoilerons. Very...
11-18-2018, 03:46 PM
Replies: 19
Views: 1,599
Posted By BMatthews

You'll gain a bit of cleaner and more accurate...

You'll gain a bit of cleaner and more accurate airflow if you extend the upper sheeting about 1" past the rear edge of the spar. Doing so should perk up the slow speed flying by delaying or...
11-15-2018, 12:30 PM
Replies: 19
Views: 1,599
Posted By BMatthews

Are those the wire sizes for the wing joiners? ...

Are those the wire sizes for the wing joiners? 1/16 for the antirotation pin is fine. But 1/8 for a main joiner is really small unless it is only for the outer panels. Even then it's rather...
11-14-2018, 09:50 AM
Replies: 21
Views: 4,725
Posted By BMatthews

That's fine. But no reason you can't find the...

That's fine. But no reason you can't find the information from other sources. Or

You can get a rough idea by looking at the max current and multiply that value by the battery pack voltage. But...
11-14-2018, 09:38 AM
Replies: 19
Views: 1,599
Posted By BMatthews

You asked about tossing it for trim flights....

You asked about tossing it for trim flights. It'll take more than just a light push but something less than an athletic javelin like throw.

What I like to do before I let it leave my hand is to...
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