Mighty Mini Sea Duck 1.2

[Jo's squadron]

So I finished my second mini sea duck and I flew it twice, but it keeps stalling!
Like I will do a dive pull up to recover and it just stalls and goes into a spin (my first one did not do that), so what is happening?
Here is a list of what I think I should try (if you guys have any other ideas pleas let me know)
- fly it nose heavy
- fly it tail heavy
- try to stall it without throttle
- cut some of the under side of the wing to ad undercamber

BTW that was on a 1500 mah 3s battery, and the all up weight was 450g (I think).

@Mr NCT, @L Edge, @Mr Man, @Horseman3381

​

 

[Mr Man]

Hmm, maybe try adding nose weight.

 

[Jo's squadron]

I won't need to, I can move the battery forward enough to have it nose heavy.

Hmm, maybe try adding nose weight.

 

[Flying Cherokee]

I won't need to, I can move the battery forward enough to have it nose heavy.

I would try that first, it sounds tail heavy to me.

 

[Mr Man]

Does it have ANY undercamber?

 

[Mr Man]

I’m normally not a big fan of it, but with these smaller planes, you kinda need it.

 

[Jo's squadron]

Does it have ANY undercamber?

It dose have undercamber

 

[Jo's squadron]

Tried it with the CG farther forward and it seems better. hard to tell in this wind.

 

[Mr Man]

Tried it with the CG farther forward and it seems better. hard to tell in this wind.

Ok 👍

 

[L Edge]

So I finished my second mini sea duck and I flew it twice, but it keeps stalling!
Like I will do a dive pull up to recover and it just stalls and goes into a spin (my first one did not do that), so what is happening?
Here is a list of what I think I should try (if you guys have any other ideas pleas let me know)
- fly it nose heavy
- fly it tail heavy
- try to stall it without throttle
- cut some of the under side of the wing to ad undercamber

BTW that was on a 1500 mah 3s battery, and the all up weight was 450g (I think).

@Mr NCT, @L Edge, @Mr Man, @Horseman3381

​

Why don't you make yourself a camera hat so you can video what is happening. That will help us analyze what the problem may be. To me, diving and if you pull up too sharply(what direction was the wind), you can very easily go into a stall and start spinning. Sea duck is not a fighter, you don't yank and bank it. If you have rudder?, might counteract it and save it spinning. If you plan to do acrobatics, better learn how to use the rudder. Once you learn how to fly inverted, can fly a knife edge, you can learn to do anything. Heck, if you get enough experience, you could even hover the Sea duck.

Just guessing, you probably pulled too sharply up and you saw the consequences.

 

[Mr Man]

Maybe he’s got more control throws on this one than his last one @Jo's squadron ?

 

[Jo's squadron]

Maybe he’s got more control throws on this one than his last one @Jo's squadron ?

I don't think so. I had plenty of throws on the last one and I did not have any problem.

 

[L Edge]

I don't think so. I had plenty of throws on the last one and I did not have any problem.

If you are looking for different excitement, build yourself a bipe. Not many go for that.

 

[Mr NCT]

Where was the CoG when it stalled?

 

[Horseman3381]

So I finished my second mini sea duck and I flew it twice, but it keeps stalling!
Like I will do a dive pull up to recover and it just stalls and goes into a spin (my first one did not do that), so what is happening?
Here is a list of what I think I should try (if you guys have any other ideas pleas let me know)
- fly it nose heavy
- fly it tail heavy
- try to stall it without throttle
- cut some of the under side of the wing to ad undercamber

BTW that was on a 1500 mah 3s battery, and the all up weight was 450g (I think).

@Mr NCT, @L Edge, @Mr Man, @Horseman3381

​

I would try moving the Battery forward as you and others have mentioned to get the CG further forward. The CG should be under, or slightly in front of the crease in the front top part of the wing.

I had a similar issue happen with the 2nd mini I built and the CG ended up being half way between that crease and the front of the wing.

I have had issues on various planes where the CG has seemed to change when I have rebuilt planes before, and it has often been because I folded the wing slightly differently/not quite correctly (this was my problem on the mini sea duck I was having issues with), the motor pods are angled with the motors pointed up slightly, or in the case of the many Sea ducks' I have built, the booms didn't get aligned quite correctly. With a plane this size, it doesn't take much to get things misaligned and add some "character" to the planes flying experience.

 

[Mr Man]

I would try moving the Battery forward as you and others have mentioned to get the CG further forward. The CG should be under, or slightly in front of the crease in the front top part of the wing.

I had a similar issue happen with the 2nd mini I built and the CG ended up being half way between that crease and the front of the wing.

I have had issues on various planes where the CG has seemed to change when I have rebuilt planes before, and it has often been because I folded the wing slightly differently/not quite correctly (this was my problem on the mini sea duck I was having issues with), the motor pods are angled with the motors pointed up slightly, or in the case of the many Sea ducks' I have built, the booms didn't get aligned quite correctly. With a plane this size, it doesn't take much to get things misaligned and add some "character" to the planes flying experience.

I once built an FT Mustang, and the CG ended up being about 3/4in farther forward!

 

[Jo's squadron]

Where was the CoG when it stalled?

on the second fold on the wing.

 

[Jo's squadron]

I would try moving the Battery forward as you and others have mentioned to get the CG further forward. The CG should be under, or slightly in front of the crease in the front top part of the wing.

I had a similar issue happen with the 2nd mini I built and the CG ended up being half way between that crease and the front of the wing.

I have had issues on various planes where the CG has seemed to change when I have rebuilt planes before, and it has often been because I folded the wing slightly differently/not quite correctly (this was my problem on the mini sea duck I was having issues with), the motor pods are angled with the motors pointed up slightly, or in the case of the many Sea ducks' I have built, the booms didn't get aligned quite correctly. With a plane this size, it doesn't take much to get things misaligned and add some "character" to the planes flying experience.

Thanks that helps!

 

[Jo's squadron]

Thanks all for the replies!
When I tested it with the CG farther forward it seems to be better, but I stripped an aileron servo doing that.
So I need to replace it before I try again.

 

[Jo's squadron]

pics of V1 and V2 coming soon.