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Search: Posts Made By: BMatthews
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Forum: Aerodynamics
01-18-2023, 02:39 PM
Replies: 7
Views: 883
Posted By BMatthews

Jd Boggs, assuming you're still checking on this...

Jd Boggs, assuming you're still checking on this thread you started you need to stop and realize a few things.

1- the wing makes the lift it does from the airfoil, the size of the wing (area), the...
09-26-2022, 11:58 AM
Replies: 4
Views: 728
Posted By BMatthews

That flies VERY nicely! Fast when you want fast...

That flies VERY nicely! Fast when you want fast and pretty slow for that sort of model when you want slow. How's the handling when you slow down? It looked nice during the landing but what's it...
09-20-2022, 05:49 PM
Replies: 5
Views: 632
Posted By BMatthews

For a hinge you should not need anything near as...

For a hinge you should not need anything near as thick as 3/32.

I gather this is a pretty large model you're considering. With that in mind Dubro offers THESE BIG HINGES...
09-20-2022, 05:43 PM
Replies: 1
Views: 611
Posted By BMatthews

Perhaps use the plans found on Outerzone of other...

Perhaps use the plans found on Outerzone of other bigger Extras as a starting point for your CAD work? Depending on what wing span you want the Roger Hardie version looks pretty nice. Maybe just go...
08-19-2022, 01:02 PM
Replies: 2
Views: 640
Posted By BMatthews

If you can post a picture of the thumbscrews that...

If you can post a picture of the thumbscrews that came with the kit. I know 4 posts might be an issue.

The other alternate is to replace the thumb screws with hex socket cap screws. Then use a...
08-19-2022, 12:57 PM
Replies: 7
Views: 1,033
Posted By BMatthews

The issue will be that the props will not be very...

The issue will be that the props will not be very strong compared to the commercial options. For the use you're looking at on those crazy 3D indoor style models like the one in the picture I'm sure...
08-19-2022, 11:37 AM
Replies: 6
Views: 1,058
Posted By BMatthews

Weight is the key issue followed by drag. A...

Weight is the key issue followed by drag. A PeeWee is actually right at home on a lightly built monoplane design with up to 36" span. But probably more at home with 28 to 32" span if some casual...
08-17-2022, 09:20 AM
Replies: 5
Views: 1,350
Posted By BMatthews

I think you'll find that most folks using a...

I think you'll find that most folks using a pull-pull or spring-pull setup are using low stretch fishing line for the pull lines such as Spyder Wire... which isn't wire but a unique plastic fiber. ...
08-17-2022, 09:10 AM
Replies: 6
Views: 1,058
Posted By BMatthews

28" span Guillows conversions would be a nice way...

28" span Guillows conversions would be a nice way to go if you can keep the model to around 5 to 6 oz in RTF condition. The PeeWee won't pull much more than that and still give sporty performance...
Forum: Aerodynamics
08-02-2022, 09:17 PM
Replies: 39
Views: 2,155
Posted By BMatthews

So you show the data for the wing but not the...

So you show the data for the wing but not the tail area details or the length of the rear of the fuselage. I'm thinking that you are using a MAC calculator rather than a proper CG calculator. And...
Forum: Aerodynamics
07-20-2022, 12:17 PM
Replies: 11
Views: 969
Posted By BMatthews

Looking at pictures of the EF Extra I see that...

Looking at pictures of the EF Extra I see that there are aerodynamic balance tab on the elevators. That's the part at the tips ahead of the hinge line. The actual fixed stab looks fairly small and...
Forum: Aerodynamics
07-20-2022, 12:08 PM
Replies: 39
Views: 2,155
Posted By BMatthews

In my world that is simply way too overweight to...

In my world that is simply way too overweight to fly well. You could fly it but due to the wing loading the stall speed and thus safe takeoff and landing speeds would be very high. And unless...
Forum: Aerodynamics
06-11-2022, 10:42 PM
Replies: 2
Views: 1,308
Posted By BMatthews

You'd never notice stuff of that sort. Or...

You'd never notice stuff of that sort. Or perhaps if the wrinkles were on the wrong part of the wing like the upper side between leading edge and a little behind the high point if they were bad they...
05-01-2022, 07:30 PM
Replies: 146
Views: 44,906
Posted By BMatthews

Truly Master quality work. I can only imagine...

Truly Master quality work. I can only imagine the hours...... And come up short. Wishing you many trouble free flights and smooth easy first flights.
04-28-2022, 10:45 AM
Replies: 2
Views: 1,245
Posted By BMatthews

Low power and heavy due to the built on starter. ...

Low power and heavy due to the built on starter. But they start super easily and run well enough to fly a model. Not the sort you want to put into anything needing high performance. But for a...
Forum: Aerodynamics
04-16-2022, 05:29 PM
Replies: 9
Views: 1,424
Posted By BMatthews

As the guys mentioned already the Vanessa won't...

As the guys mentioned already the Vanessa won't tell you where the CG NEEDS to be. It's just a replacement for your fingertips to show where it's balanced at the moment. It doesn't replace the...
03-12-2022, 09:35 AM
Replies: 8
Views: 4,137
Posted By BMatthews

Jhalliday, the plans are out there. And there's...

Jhalliday, the plans are out there. And there's not a lot of complex parts to be cut. You could build a new version from the plans at Outerzone. Perhaps this time with electric power in the nose...
01-15-2022, 09:47 PM
Replies: 9
Views: 2,047
Posted By BMatthews

I picked up on both model planes and SF within...

I picked up on both model planes and SF within some months of each other. I recognized the name but thought it was just a coincidence until I read the author notes on the cover flap of the model...
01-10-2022, 04:29 PM
Replies: 8
Views: 1,734
Posted By BMatthews

Hey, a lot of models were done with the lighter...

Hey, a lot of models were done with the lighter softwoods before balsa became a popular material and flew just fine. In fact there was a resurgence in using pine, spruce and similar during the war...
12-10-2021, 06:04 PM
Replies: 17
Views: 1,924
Posted By BMatthews

Well, it was you that picked the thermal glider...

Well, it was you that picked the thermal glider to use for the basis for your modified design. So it started as more of a thermal glider right off the bat.

There's certainly nothing at all wrong...
12-09-2021, 09:58 PM
Replies: 17
Views: 1,924
Posted By BMatthews

If you have a lot of slopes that you can access...

If you have a lot of slopes that you can access to fly from then this shifts the goals a fair amount. Up to now my posts and suggestions have centered on the idea that you were working on primarily a...
12-09-2021, 12:00 PM
Replies: 17
Views: 1,924
Posted By BMatthews

So this will be a slope soaring model primarily?...

So this will be a slope soaring model primarily? In that case you don't really need the outer dihedral break at all. But the original 3 at the center will make the model act a touch more groovy and...
12-07-2021, 01:24 PM
Replies: 17
Views: 1,924
Posted By BMatthews

PM'd about the picture.... Here's my own...

PM'd about the picture....

Here's my own thinking when it comes to designing such a model....

If I'm using ailerons anyway then I need a sub trailing edge for the section of the panel where the...
11-28-2021, 02:49 PM
Replies: 2
Views: 740
Posted By BMatthews

No one else yet? Given that the angle is...

No one else yet?

Given that the angle is there at all the only possible reason is to permit the blade to cone upwards by that amount of an angle. And if you look around at other autogyro plans...
11-16-2021, 01:43 PM
Replies: 17
Views: 1,924
Posted By BMatthews

I learned my CAD on an early copy of TurboCAD....

I learned my CAD on an early copy of TurboCAD. And much like playing a music instrument I've stuck with it rather than try to learn new keystrokes with any other option. It's been maybe 20 years of...
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