ShrubSmacker Release
- Thread starter Grifflyer
- Start date
PoorManRC
Master member
Grifflyer
WWII fanatic
It's already got some undercamber, and I want decent speed out of this design so I want to keep the excess drag to a minimum.Not to oversimplify.....
But maybe a little more undercamber on the Wingtips?
Grifflyer
WWII fanatic
That's alright we don't start off as Einstein.Yeah, undercamber doesn't do a lot for speed...
I'm definitely no expert, sadly that was my only idea.
Some things I'm going to try is add vortex generators to the wingtips, add a stall fence, and messing around with incidence angles and CG. If those don't work, I'll add more undercamber or add a stall strip to the center of the wing.
Beeblebrox
Member
First of all, I love this plane! I am on my second version due to trying to fly inverted too low without sufficient experience... but how else am I going to learn, right?
Could the tip stalls be related to CG? I have my CG a bit forward of the markings on the plans, at about 40-45mm from LE, and I can´t say that I've had any trouble with tip stalls.
I will try to provoke the plane a little next time a fly and see what happens.
Could the tip stalls be related to CG? I have my CG a bit forward of the markings on the plans, at about 40-45mm from LE, and I can´t say that I've had any trouble with tip stalls.
I will try to provoke the plane a little next time a fly and see what happens.
Grifflyer
WWII fanatic
It's possible, CG location can have an effect on how the plane stalls, which is another thing I was going to mess around with.First of all, I love this plane! I am on my second version due to trying to fly inverted too low without sufficient experience... but how else am I going to learn, right?
Could the tip stalls be related to CG? I have my CG a bit forward of the markings on the plans, at about 40-45mm from LE, and I can´t say that I've had any trouble with tip stalls.
I will try to provoke the plane a little next time a fly and see what happens.
I set the recommended CG a little bit on tail heavy side to get more authority out the tail, but after hearing about Stoobiedoo's success with enlarging the control surfaces it sounds like a better alternative.
I'm glad you like the plane!!! Do you have any pictures?
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Grifflyer
WWII fanatic
I took her out to fly again with the vortex generators, 1/2 inch added to the control surfaces, and the CG recommended by Beeblebrox, and it flies a lot better, though it was a little gusty so I couldn't tell if the tip stall issue has been resolved.
There's a few things I found out during two flights that need changing
(1) Wider stance landing gear
(2) Stronger Elevator (the plane was rolling whenever I used the elevator, most likely because the center needs reinforcement)
I got some more servos so I'm going to do a rebuild with flaps.
There's a few things I found out during two flights that need changing
(1) Wider stance landing gear
(2) Stronger Elevator (the plane was rolling whenever I used the elevator, most likely because the center needs reinforcement)
I got some more servos so I'm going to do a rebuild with flaps.
Grifflyer
WWII fanatic
I just took the new one with flaps out to fly... and man is it a lot easier to slow this down to land!! I didn't check the CG because I was so excited to go try and fly the new one, so I don't know where it was but it still felt a little tail heavy at low speeds.
There was a bit of ballooning whenever I applied the flaps, so I'm going to program in some down elevator whenever I activate the flaps. It tip stalled once, but that was when I banked a bit too much when I was going really slow with full flaps, not a big deal.
There was a bit of ballooning whenever I applied the flaps, so I'm going to program in some down elevator whenever I activate the flaps. It tip stalled once, but that was when I banked a bit too much when I was going really slow with full flaps, not a big deal.
BATTLEAXE
Legendary member
Just to let you know Grifflyer, I downloaded and printed off your plans and upon quick inspection I found a problem... there is nothing for me to complain about lol! Beautiful job bro. I can't wait to build this and put my own little spins on it. I checked out your maiden on it fighting hurricane force winds. Looks like a solid build and flyer. Thx for the contribution to the community and keep it shiny side up.
Grifflyer
WWII fanatic
This plane is definitely on my short list of planes to build. I have the Bush Whacker but think I'll build this one first. I'll be adding my vortex generators to it. I know they've helped my timber out a lot.
https://www.thingiverse.com/thing:3349698
https://www.thingiverse.com/thing:3349698
Grifflyer
WWII fanatic
Ooh those look cool, I'm going to try 3d printing some of those.
I should have plans out for the wing with flaps in the next few days.
Grifflyer
WWII fanatic
I took her out to fly yesterday, and I'm quite positive I've got the flight characteristics as good as they can get. So now I'm going to work on making this an easier build.
For Example:
Easier servo installation
The option to add flaps after you build the wing
Get the trailing edge of the wing stronger
Lighten up the tail a bit more
More room for the battery
I've already got ideas on how to fix all of these so it shouldn't be too hard.
For Example:
Easier servo installation
The option to add flaps after you build the wing
Get the trailing edge of the wing stronger
Lighten up the tail a bit more
More room for the battery
I've already got ideas on how to fix all of these so it shouldn't be too hard.
whackflyer
Master member
Hey @Grifflyer, it appears the link for the plans is down, unless I'm doing something wrong. If you could fix the link or just PM me the plans that'd be great! Planning to make a ShrubSmacker on floats! Thanks!
