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Search: Posts Made By: UStik
Showing results 1 to 25 of 500
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09-04-2021, 10:11 AM
Replies: 42
Views: 4,784
Posted By UStik

Looks wonderful! It would be a shame if it would...

Looks wonderful! It would be a shame if it would never fly, so couldn't it be flown at the AMA field in Muncie before putting it in storage? There should be expert pilots (with insurance) who would...
09-01-2021, 03:12 AM
Replies: 42
Views: 4,784
Posted By UStik

Flyer, seems you don't know that Ken is the...

Flyer, seems you don't know that Ken is the designer. ;) For some information, see this thread...
08-24-2021, 12:17 PM
Replies: 4
Views: 793
Posted By UStik

I think you can't win. A gyro in damping mode...

I think you can't win. A gyro in damping mode makes the movements slower but still you can't see them far away. In lock mode, it's the same like a helicopter's tail gyro: there will be no yaw but you...
08-23-2021, 12:44 PM
Replies: 42
Views: 4,784
Posted By UStik

Unthinkable that something from you could be...

Unthinkable that something from you could be embarrassing, but good luck anyway! :-)
08-17-2021, 04:15 AM
Replies: 42
Views: 4,784
Posted By UStik

Looks immaculate.

Looks immaculate.
Forum: Aerodynamics
08-12-2021, 01:42 AM
Replies: 14
Views: 4,393
Posted By UStik

Yet another guess on second (or third?) thought,...

Yet another guess on second (or third?) thought, to add to the confusion, just because it's so much fun (a fairy tale from One Thousand and One Nights, or my post #1001 :cool: ):

Remembered that...
Forum: Aerodynamics
08-10-2021, 04:21 AM
Replies: 14
Views: 4,393
Posted By UStik

Yes (sigh), our theories are just not good...

Yes (sigh), our theories are just not good enough. :cool:
(Couldn't resist - my post #1000)
Forum: Aerodynamics
08-09-2021, 03:13 AM
Replies: 14
Views: 4,393
Posted By UStik

That's a nice and often heard saying but I think...

That's a nice and often heard saying but I think it's actually a humorous corruption of "There is nothing more practical than a good theory", attributed to Kurt Lewin. And you bet that the designer...
Forum: Aerodynamics
07-22-2021, 03:40 AM
Replies: 14
Views: 4,393
Posted By UStik

Yes, at least that's the simplest explanation I...

Yes, at least that's the simplest explanation I can think of, and I don't see other effects here, either. P-factor should be small with the small prop and there would have to be down-thrust for a...
07-20-2021, 01:02 PM
Replies: 42
Views: 4,784
Posted By UStik

Stunning! How on earth did you build these wings?...

Stunning! How on earth did you build these wings? I imagine you made one jig for both and the enabling simplification was using a flat-bottom airfoil. And you didn't use CAD or laser-cutting, I...
Forum: Aerodynamics
07-20-2021, 12:38 PM
Replies: 14
Views: 4,393
Posted By UStik

Just guessing here: Up thrust makes for an...

Just guessing here:

Up thrust makes for an upwards component of thrust, and then the propeller being in front of the C/G makes for an up-pitching moment, cancelling the down-pitching moment by the...
07-18-2021, 08:55 AM
Replies: 42
Views: 4,784
Posted By UStik

Wow, the whole airplane is one complex shape!...

Wow, the whole airplane is one complex shape! Very unusual and somehow "organic". Now I see why there are skids under the stab. The open-rocker engine matches this piece of art. :-)

The Brushfire...
07-17-2021, 10:56 PM
Replies: 42
Views: 4,784
Posted By UStik

Great sanding job on the complex shape!

Great sanding job on the complex shape!
07-02-2021, 07:54 AM
Replies: 17
Views: 3,895
Posted By UStik

This is so interesting, I'd like to see more. I...

This is so interesting, I'd like to see more. I recognize only about half of them so it would be nice if you'd name them.
06-29-2021, 02:05 PM
Replies: 9
Views: 2,880
Posted By UStik

Seems you're doing with a mirror what else could...

Seems you're doing with a mirror what else could be done "virtually" in a CAD system. No idea about the airplane though.

(Once I "built" your Brushfire in a simulator; now just 4 years in...
05-15-2021, 10:48 PM
Replies: 7
Views: 952
Posted By UStik

https://seniorpattern.com/DR.html

https://seniorpattern.com/DR.html
04-26-2021, 12:42 AM
Replies: 7
Views: 1,125
Posted By UStik

The other way around: this kind of airplane is...

The other way around: this kind of airplane is short-nosed because they balance quite aft. Their wing airfoil is cambered and hence they need some decalage. Apart from that, the pictures of this...
Forum: Aerodynamics
09-30-2020, 03:13 AM
Replies: 45
Views: 6,522
Posted By UStik

Thanks.

Thanks.
Forum: Aerodynamics
09-29-2020, 05:49 AM
Replies: 45
Views: 6,522
Posted By UStik

Bump. cutarug, in case it helps you, I...

Bump.

cutarug, in case it helps you, I measured the G-loads during loops (just for the fun of it). Those were not precision loops, just "normal", that is flown not especially slow and wide and not...
08-03-2020, 05:01 AM
Replies: 10
Views: 1,590
Posted By UStik

Very good advice to start with more forward...

Very good advice to start with more forward balance, no doubt. In this case, I wouldn't just start at 25% from leading edge. The "lifting stab" will not lift before the C/G is set far backwards, but...
Forum: Aerodynamics
07-15-2020, 01:55 AM
Replies: 45
Views: 6,522
Posted By UStik

Now I remember you mentioning the biplane's...

Now I remember you mentioning the biplane's incidence angles. I think the stall initiating the flick could have to do with that, but it would still require that it's an inverted stall (that is the...
Forum: Aerodynamics
07-15-2020, 01:13 AM
Replies: 45
Views: 6,522
Posted By UStik

Do you think the engine could stomach a prop with...

Do you think the engine could stomach a prop with more pitch? Could be even less diameter, just to get more speed. Maybe that could pull the airplane through the loop no matter what kind of stall is...
Forum: Aerodynamics
07-14-2020, 10:20 PM
Replies: 45
Views: 6,522
Posted By UStik

Jaco, that's what I thought at first, but...

Jaco, that's what I thought at first, but wouldn't you end up in a spin then? (Hence my crazy idea with inverted stall, assuming the loop is so big that there is not even positive G and the airplane...
Forum: Aerodynamics
07-10-2020, 02:20 AM
Replies: 45
Views: 6,522
Posted By UStik

Things are not always as they always are. Or, as...

Things are not always as they always are. Or, as my driving instructor told me 50 years ago: you can't even think as silly as it comes. cutarug, I mean what you told here might all contribute to a...
Forum: Aerodynamics
02-05-2020, 06:36 AM
Replies: 16
Views: 2,064
Posted By UStik

Flat-bottom wing is a tried and proven concept,...

Flat-bottom wing is a tried and proven concept, especially with RE models. I don't think undercamber would help.

If fuselage shape and canopy really shadow the vertical tail I'd try to get the...
Showing results 1 to 25 of 500
 


 
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