Pitts or Ultimate 120?
06-16-2010, 08:50 AM
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Pitts or Ultimate 120?
Which would you choose? I will be converting to electric and both look like they would be easy conversions.
I've seen a few build threads on the Ultimate but can't find any information on the Pitts.
I've seen a few build threads on the Ultimate but can't find any information on the Pitts.
06-16-2010, 01:12 PM
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RE: Pitts or Ultimate 120?
The Ultimate.
IMHO the Ultimate has better all around characterstics.
The Pitts has a short coupled tail, that can be problematic, and a higher wing loading.
IMHO the Ultimate has better all around characterstics.
The Pitts has a short coupled tail, that can be problematic, and a higher wing loading.
11-03-2013, 04:25 PM
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I just acquired one of these that is set up for nitro however I have a quantity of 5000 6s packs so the thought to go clean has crossed my mind. Problem here is I am not good with matching power systems. What would be the hot 12s setup and is it a viable option? Thanks....
11-04-2013, 02:37 PM
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Which plane did you get?
In matching power systems, you ALWAYS start out with the projected AUW of the plane.
If you went with the Ultimate, let's assume an 11 lb plane
If you want aerobatic flying....
11lbs x 150watts = 1650 watts
Let's equate that to HP as a cross check...
1650/745 = 2.2 HP Hmm. Not bad for an 11lb plane swinging a big prop but you may want a bit more power...
Let's take it up to 2000 watts..... and since you have 6S packs...
2000w / 22.2v = 90 Amps
That doesn't look too bad given that you have 5000mAh packs.
So now you need an ESC that can handle 90A continuous ( for safety ) or a 100-120A ESC.
A 2000 watt motor that accepts 22.2 volt input...
Let's assume that you'll spin a prop around 8500 RPM at most...
8500 / 22.2v = 382 KV
A 380KV motor or something in that ball park will do.
2000watts / 745 = 2.68 HP.
Thrust HP says a 17x8 prop swung at 8500 RPM = 2.9 hp while a 17x6 prop swung at the same speed = 2.2 hp.
So I'd choose the 17x8 prop.
That will give you a static airspeed of 48.3 MPH. If you want more speed, use a smaller diameter but higher pitch prop.
In matching power systems, you ALWAYS start out with the projected AUW of the plane.
If you went with the Ultimate, let's assume an 11 lb plane
If you want aerobatic flying....
11lbs x 150watts = 1650 watts
Let's equate that to HP as a cross check...
1650/745 = 2.2 HP Hmm. Not bad for an 11lb plane swinging a big prop but you may want a bit more power...
Let's take it up to 2000 watts..... and since you have 6S packs...
2000w / 22.2v = 90 Amps
That doesn't look too bad given that you have 5000mAh packs.
So now you need an ESC that can handle 90A continuous ( for safety ) or a 100-120A ESC.
A 2000 watt motor that accepts 22.2 volt input...
Let's assume that you'll spin a prop around 8500 RPM at most...
8500 / 22.2v = 382 KV
A 380KV motor or something in that ball park will do.
2000watts / 745 = 2.68 HP.
Thrust HP says a 17x8 prop swung at 8500 RPM = 2.9 hp while a 17x6 prop swung at the same speed = 2.2 hp.
So I'd choose the 17x8 prop.
That will give you a static airspeed of 48.3 MPH. If you want more speed, use a smaller diameter but higher pitch prop.
