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Old Jun 26, 2013, 01:24 PM
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Sonic Modell Pitts Python 1400mm Large RC Plane (EPO Version)

Anyone have one of these. Troybuilt sells these and they are setup for a 6S lipo. Comes with Motor,ESC and servo's.
Nice plane but the manual CG is way off. Manual shows 65mm but CG is actually between 110 and 120mm. IMHO, The factory most have set it at 65mm so they could sell more planes. At 65mmCG it is so tail heavy you could never fly it correctly
At 110mm -120mm CG it fly's great and the quality is much better then most foamy planes I have seen.
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Old Jul 05, 2013, 01:47 AM
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Just stumbled upon it at the TBM site...

http://www.troybuiltmodels.com/items...TTS-55PNP.html

How does it fly? Can you do 3D or it is more of a scale plane?
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Old Jul 05, 2013, 05:22 PM
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I don't own one but I've had one on loan for a few days. A mate of mine owns a LHS and he bought a few in and lent me one to try out.

On the standard power system (5052 500kv), it is very underpowered on the recommended 4S battery. It does fly, but just putters around the sky, no way would you be doing any 3D with it.

We tried it on 6S just for laughs. Didn't have any different sized props so was over propped for 6S but man did she move! We knew we'd heat the pack up so we kept it a short flight, but had no issue with infinate knife edge, rolling harriers, flat spins etc. Looking at the specs for that 6 combo, I'd say it should be a decent performer.
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Old Jul 05, 2013, 05:34 PM
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Quote:
Originally Posted by Socratous View Post
I don't own one but I've had one on loan for a few days. A mate of mine owns a LHS and he bought a few in and lent me one to try out.

On the standard power system (5052 500kv), it is very underpowered on the recommended 4S battery. It does fly, but just putters around the sky, no way would you be doing any 3D with it.

We tried it on 6S just for laughs. Didn't have any different sized props so was over propped for 6S but man did she move! We knew we'd heat the pack up so we kept it a short flight, but had no issue with infinate knife edge, rolling harriers, flat spins etc. Looking at the specs for that 6 combo, I'd say it should be a decent performer.
I think that's why I guess Troybuilt Models only sells the 6S version.
I have not flown the 4S model but I can tell you the 6S version fly's 3D great. The manual said to use a 3300mah lipo. I choose to use a 4500mah do to the manual is wrong on the CG. The manual said the CG was 65mm. The CG that I use is 110mm .
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Old Jul 05, 2013, 07:18 PM
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Yes, I flew mine at 110mm too.There is another thread on this model somewhere else on here (quite old) and they mentioned the same thing. I'm surprised there isn't more interest in this model. I'd love to get one myself one day, but 1 it only JUST fits in the car fully assembled (and still takes a bit of jiggling to get it there) and 2 my wife would probably divorce me if I bought another plane any time soon! lol
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Old Oct 23, 2014, 05:08 PM
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Does somebody can tell me if it's possible to fly this modell at the right cg with 2x 3s 2200mah (6s setup) ?
Thanks!
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Old Dec 07, 2015, 01:58 PM
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UPDATE Just received the kit

Just got it and the manual says 110mm on the top wing so some one got the message. So fat great construction. Manual is useless except for the CG but need to be builder and just use it as a guide. Ver i have says and it will have 6 cells.
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Old Feb 16, 2016, 09:07 PM
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Quote:
Originally Posted by capecoral View Post
Just got it and the manual says 110mm on the top wing so some one got the message. So fat great construction. Manual is useless except for the CG but need to be builder and just use it as a guide. Ver i have says and it will have 6 cells.
Have you flown this? Do you like it?
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Old Apr 18, 2016, 12:03 AM
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Pitts Python 55" Sonic Model

I bought this a few months ago and like it. It looks great in the air and is extremely maneuverable. I went from an Apprentice 15s, my first plane, to this so it's a big jump. It has a lot of power and will do pretty much anything you ask it to but there will be some modifications you'll need to make:

Mine is tail heavy even when trying to set the CG at the right place. I have a 6s battery that I put as far forward as it will go and have added lead weights as far forward as I can get them and it is still it tail heavy. I think I used too much epoxy on the tail and that is causing it. I would only apply several spots of epoxy when securing it. Being as the tail is so far from the CG a little makes a big difference. I'm considering trying to replace the tail but cutting it off but it's going to be a challenge if I do. I've added a lot of weight up front and don't want to add more so I'm still not sure how I'll fix that. I've flown it three times and while it always wants to climb it was still fun and easy to manage. Take offs are essentially effortless bc it's already on a takeoff attitude. I flew it once in heavy winds and still was able to bring it back safely.

The epoxy provided had decompressed (probably from being shipped in flight to the US) and was useless which wasn't a big deal but FYI.

There's a bit of work to do in securing the ESC as you have to make a mount for it under the battery and position it so you have long enough leads to reach the engine on one side and the receiver on the other. I secured a piece of basswood under the battery after securing the ESC to it first in the right position. Not too difficult however.

The landing gear. As mentioned in other forums it's not sturdy enough. This is a relatively heavy plane and the landing gear was only good for about 7-8 landings. Other people have mentioned only getting a couple landings out of it first before noticing that the wheel mounts are getting loose. The wheel mounts have two holes in them each but they are only held in place with one screw. I will have to cut out the foam on the bottom to expose the wood so that I can better secure the landing gear using two screws for each wheel.

Once I get the CG right and fix the landing gear it will be a lot of fun to fly. I go on a trip to MN every year by a lake so I'm considering putting floats on it. Maybe with the drag of the floats it will counter-act the tail heavyness? Not sure but I'm open to suggestions.

Hope that helps!
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