Newbie to 4D VPP (in a flightflex UCANDO)

Newbie to 4D VPP (in a flightflex UCANDO)
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Newbie to 4D VPP (in a flightflex UCANDO) - 11/25/2006 10:07:12 AM

GordonFreeman

Posts: 118
Joined: 12/20/2003
From: Ironhorse, WI, USA
Status: offline

Hi, new to this 4D VPP stuff. I'm just setting everything up and haven't flown it yet.

The 411:

Great Planes U Can Do 3D flightflex (put landing gear from a Tensor 4D on it so I can land with the VPP)
Himaxx 2816-890
Some old "Tower Pro?" ESC (Not even sure how to program it, if it is programmable)
VPP101 (http://www.maxxprod.com/mpi/mpi-29a.html) using the 11" blades.
3S 1800mAh
7CAP Futaba (Heli mode)
HS-55 servos

Plane is about 1 lb ready to go. It normally flies great with a 12x6 slow fly prop. Has about 2:1 thrust to weight. I also fly helicopters so I am familiar with 3D throttle/pitch curves. I don't expect any great performance from this set-up, maybe 1.5:1 thrust to weight. I had the plane and thought I'd try it.

First thing I notice is maybe my pitch servo is not strong enough (HS-55). It seems like if the prop is spinning too fast it does not get to full pitch (or full thrust). There is a bit of flex in the whole system, but the servo is mounted basically on the inside of the motor mount stick (so minimal flex from the foam).

I have played around with the throttle and pitch curves to try to keep the RPM down before it gets to full pitch and that seems to be working ok. In throttle hold I get full throw on the pitch. I even set up a throttle/pitch curve to hold the throttle at about 20% and have a normal pitch curve and it gets to full pitch fine.

I guess my question is, are these typical problems with the VPP set-ups? Is a throttle governer mode recommended? Tips? Hints?

Thanks.

Post #: 1

RE: Newbie to 4D VPP (in a flightflex UCANDO) - 12/17/2006 6:06:56 PM

WhtBronco

Posts: 2084
Joined: 10/3/2002
From: Winchester, VA, USA
Status: offline

You're gonna likely need a stronger servo.

_____________________________

Chris
Wish I was flyin'!

(in reply to GordonFreeman)

Post #: 2

RE: Newbie to 4D VPP (in a flightflex UCANDO) - 12/18/2006 9:04:10 AM

hellblastervolly

Posts: 204
Joined: 3/24/2004
From: Lancaster, PA, USA
Status: offline

How much pitch your giving at full throttle, there is to much pitch with the vvp. Throttle governor mode is recommended only if you are over amping your motor. Like WhtBronco said maybe you can get a stronger servo or make the area of the servo more rigid, no flex at all in this area.

Fernando

_____________________________

" A Pilot Has To Do What A Pilot Has To Do To Fly "

(in reply to WhtBronco)

Post #: 3

RE: Newbie to 4D VPP (in a flightflex UCANDO) - 12/22/2006 3:24:59 PM

flyingace451

Posts: 948
Joined: 3/6/2005
From: Hixson, TN, USA
Status: offline

Maybe use an HS-65 instead? It's a slightly beefier servo, so you could give it a try.

_____________________________

As I lay in bed at night I look up at the stars and think to myself, "Where the heck is the ceiling!?"

(in reply to hellblastervolly)

Post #: 4

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