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Jan 29, 2013, 03:56 PM
Registered User
ron-sand's Avatar
If it ain't broken, don't fix it

In any case to get it perfect you might want to tune it so that it flies level both on and of throttle:

Shim on top will give more down thrust (or less up-thrust, depending at how you look at it).

Shim on bottom will give you more up-thrust (or less down-thrust depending at how you look at it).
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Jan 29, 2013, 04:57 PM
HD FPV on a 4m glider
I know this might not be the perfect place for this question, but I know that many of you would have a solution which is why I post this here.

I have a dynam 185 sonic rc glider and when I chuck it into the air it just wants to barol roll left. I trimmed its ailerons and rudder all the way to the right which keeps it more steady but now performans is decreased and battery is drained ( do to the extra drag as the ailerons and rudder stick out like crazy).

Im sure this has happened to someone elses plane before. does anyone know what I should do to fix this so I dont have to be flying trimmed all the way to the right?? (like a couterbalace, etc).
thanks
Jan 29, 2013, 05:13 PM
Registered User
imagebuff's Avatar
Quote:
Originally Posted by swartzracing
Hey guys I have no spacers on my motor mount and the penguin flies pretty good. Do you guys recommend the 3mm spacers on the top of the motor mount?

Thanks
Mine is doing much better with spacers on the bottom. No more lurching upward on throttle.
Jan 29, 2013, 07:08 PM
Aerial Operator
thanks guys ill try it out and see how she does!

Much appreciated
Jan 29, 2013, 09:55 PM
Registered User
Quote:
Originally Posted by swartzracing
Hey guys I have no spacers on my motor mount and the penguin flies pretty good. Do you guys recommend the 3mm spacers on the top of the motor mount?

Thanks
I have mine on the top like in the manual, and it fly's great! I find the penguin to be the best hand lunching aircraft I have. I lunch it with about 1/2-3/4 throttle and I do a long steady lunch dropping down to one knee. My penguin flys right out of my hand and heads straight out to the horizon with a slight climb.
Jan 29, 2013, 10:03 PM
KG7TTQ - Las Vegas
mark_q's Avatar
This is all too weird...
Because it is a pusher and the motor is mounted behind and above the CG, top spacers should drive the nose more down under power.

However the actual results vary and they vary a lot. So, I wonder if it is a thrust/wash problem? That is, since a significant amount of the prop wash hits the top of the horizontal stab, could this overcome the normal thrust angle application?

Just a random hmmmm?
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Jan 29, 2013, 10:20 PM
Registered User
ron-sand's Avatar
It depends a lot on your CG and the incidence of the tail to main-wing. In addition it depends on the accuracy of the built in angle in the motor pod..... And not to forget any offset (trim) on the elevator to level the model.

A lot of variables here you see.

I have read that the tail/main-wing incidence can vary from kit to kit. Mine was set at 3.5 degree positive which i way to much for my style of flying. I reduced it to 2 degrees and it suits me much better. I also have the CG at 90-95 mm (85 mm as per manual).

So there you go. This is a big part of the explanation for the different thrust angles reported
Jan 30, 2013, 11:14 AM
Registered User
sutors's Avatar
Has anyone opened up the main wings? I'm trying to install the lighting system but I'm having hard time fishing the cables through. I'm not sure what's the best way to go about it.
Jan 30, 2013, 11:25 AM
Registered User
I made small holes in the hollow sections to run my DragonLink antenna and VTx wires out to the wing tips. I then used needle nose pliers to pull them along and covered the holes with extreme tape when done.
Jan 30, 2013, 11:34 AM
Registered User
Deadstick 8409's Avatar
Quote:
Originally Posted by sutors
Has anyone opened up the main wings? I'm trying to install the lighting system but I'm having hard time fishing the cables through. I'm not sure what's the best way to go about it.
I ran wires from the servo outboard. Strobes powered by servo power.
Jan 30, 2013, 02:31 PM
KK4NOP
Mike Freas's Avatar
Quote:
Originally Posted by sutors
Has anyone opened up the main wings? I'm trying to install the lighting system but I'm having hard time fishing the cables through. I'm not sure what's the best way to go about it.
That is the one thing I think they screwed up on this was the preglued bottom wing panels. I fished all my stuff through the wing which is a huge pain.
Jan 30, 2013, 04:14 PM
Registered User
sutors's Avatar
Yeah. I agree. They should not have come preglued. I'll try what cactus suggested..
Jan 30, 2013, 04:42 PM
Registered User
imagebuff's Avatar
I used the servo extension cable which was already in place to pull through a dummy line to attach other things I wanted to fish through the channel. One way to do it.
Jan 30, 2013, 05:36 PM
KK4NOP
Mike Freas's Avatar
Quote:
Originally Posted by imagebuff
I used the servo extension cable which was already in place to pull through a dummy line to attach other things I wanted to fish through the channel. One way to do it.
I used a dowel. I needed to get a antenna extension in one wing and antenna in the other.
Jan 31, 2013, 02:20 AM
Aerial Operator
Hey Guys I'm thinking about going to a 4S battery to run the 2815 with the APC 9x6E Prop. What are you guy's thoughts on this setup compared to a 3S 5000mah pack?

Flight Time?
Thrust?
Max amps on esc?

Look forward to hearing back from all you nerds (including myself) on RCG

Cheers,


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