I attempted to maiden a new slope wing at the weekend, the "Pluto" from epp-modelle http://epp-modelle.com/product/pluto-epp/ (http://epp-modelle.com/product/pluto-epp/). Possibly one of my worst maidens ever! God the thing was a nightmare to fly. After taking some advice on how to try and trim it we got it fly (a little bit) better but it was still a crazy roller coaster ride!
I'm hoping it was tail heavy so have added 25g extra nose weight. Also reduced my throws mechanically as much as I can so I can increase the rates on the Taranis, ( I had them set to 10% at one point!)
Any other tips please, PLEASE let me know :)
youtu.be/UdfxqX9Jdk0 (http://youtu.be/UdfxqX9Jdk0)
I don't know the plane at all, but I would definitely say tail-heavy, looking at it.
Quote from: Dillwhacker on April 25, 2016, 10:29:49 PM
I don't know the plane at all, but I would definitely say tail-heavy, looking at it.
I hope so, if not it will be going in the bin pretty soon! ;D
It looks like the control throws are a bit excessive to me. bringing the cg forward a smidgen may help, but I would try giving a few test glides on a flat field first, in not a lot of wind. Get it trimmed for a hands off nice straight glide first, and then venture up onto the slope...
Andy
Good thing this wasn't a maiden paragliding flight !!
^-^
Quote from: Andy Sayle on April 25, 2016, 11:23:08 PM
It looks like the control throws are a bit excessive to me. bringing the cg forward a smidgen may help, but I would try giving a few test glides on a flat field first, in not a lot of wind. Get it trimmed for a hands off nice straight glide first, and then venture up onto the slope...
Andy
I've reduced them as much as I possibly can, might cut a channel out so I can go even lower on the servo arm.
Quote from: wgt40w on April 25, 2016, 11:28:04 PM
Good thing this wasn't a maiden paragliding flight !!
^-^
Good job it is made out of epp, damn thing bounces well at least ^-^
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On a short coupled wing like that, I'd be surprised if you need more than 5-10mm throw on the elevator in total. And aileron will be as much as you like to get a wickedly fast roll rate! If you bring teh cg forward a bit, it will reduce the elevator sensitivity. But, you will find the elevator trim will become very speed specific. personal preference and all that!
If you can't control it in pitch, then deffo tail heavy.
I have a wing that is a pussy-cat with the Go-Pro on the front, and is impossible to fly without...
COG me old matey !
IMO.
If the CG is as per the plan then it's too much throw. If that's the case then could still put weight up front and it'll calm down but it won't be flying as well or as fast as it can do. I've had loads of slope wings and the CG and control throws are pretty critical if you want it to fly to its potential.
The cg must have been a little off at I've added an extra 25g and it now looks spot on. With a thin plank life this is quite difficult to work out the exact point of cog.
My mechanical throws were too much to start with, I've reduced them as much as I can and increased my rates back up.
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There's usually a thread on RC Groups for the various wings where you'll get lots of good info on setup. I'm sure I've seen this shape before, is it an NCFM design?
Yeah it's a copy of the Bluto. The NCFM models are expensive for a foam model so this was a cheap alternative. The old adage of you get what you pay for its coming to mind but I'll keep at it for now..
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Looks like a lot more weight on the nose will calm it down a bit.
Funny watching it though, twitchy bugger :)
The first 12 seconds of this video are my favorite :laugh:
Yep thought I'd upload it for comedy value ::) I'll be sure to video the next attempts to see if it gets any better..!
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Quote from: AdamG on April 26, 2016, 10:36:14 AM
The first 12 seconds of this video are my favorite :laugh:
If you listen closely you can here me arguing in the background with Andy the chap trying to launch it for me :D
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Quote from: dp106 on April 26, 2016, 10:16:53 AM
Yeah it's a copy of the Bluto. The NCFM models are expensive for a foam model so this was a cheap alternative. The old adage of you get what you pay for its coming to mind but I'll keep at it for now..
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Yeah they're worth it though, I've got an M60 it flies like it's on rails but also needs the cg spot on and almost imperceptible elevator throws.
Quote from: Loopdreams on April 26, 2016, 10:47:16 AM
Yeah they're worth it though, I've got an M60 it flies like it's on rails but also needs the cg spot on and almost imperceptible elevator throws.
I think I might need to dig out a channel by the servos to get on the bottom hole of the servo arm. It will mean messing up my nice colour scheme though :'(
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Footage from my second attempt to maiden/fly the Pluto.. What a difference! Added another 30g on the nose and it was a hundred times better!
Even increased the mechanical throws after this flight to increase my roll rate
youtu.be/F6Z00i_7a90 (http://youtu.be/F6Z00i_7a90)
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Cool, nice one !
COG is deceptive, especially on short coupled things...
As it creeps foreward, it just slowly becomes sluggish and soggy.
Let it creep backward and BOOM! - suddenly becomes totally un-flyable.
Been there...
;D
Yeah I think I've changed it by 2mm at most! Just got to try and carve out a hole to fit the weight in now while not weakening the nose
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Looks good now - bl@@dy hell I'd love to fly there - looks gorgeous :-*
Have fun !