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Search: Posts Made By: BMatthews
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Forum: Aerodynamics
02-07-2020, 08:57 PM
Replies: 14
Views: 348
Posted By BMatthews

Your weak rudder to roll might be a couple of...

Your weak rudder to roll might be a couple of things. First off flying speed makes a difference. Try flying a touch faster and see if things perk up. Next is that comparing the new blue and yellow...
12-17-2019, 09:21 AM
Replies: 38
Views: 5,664
Posted By BMatthews

Dang PS, that's mighty impressive! I bet that...

Dang PS, that's mighty impressive! I bet that the model gets small in a hurry when you're flying it ! ! ! !
Forum: Aerodynamics
11-12-2019, 01:39 PM
Replies: 16
Views: 1,275
Posted By BMatthews

Much of why bigger flies like it is more stable...

Much of why bigger flies like it is more stable has to do with the moments of intertia. Small planes need lower wing loadings to fly well so they tend to be very light. And what weight they do have...
10-20-2019, 02:14 PM
Replies: 7
Views: 935
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: 1,700
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: 1,700
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: 537
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: 870
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: 1,117
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: 387
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: 362
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: 1,016
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: 439
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: 13
Views: 1,255
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: 1,050
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: 13
Views: 1,255
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: 13
Views: 1,255
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: 407
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: 1,696
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: 464
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: 445
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: 1,025
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: 257
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: 1,025
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: 1,696
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...
Showing results 1 to 25 of 500
 


 
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