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Old Jan 16, 2009, 05:46 AM
Registered User
Madras India
Joined Aug 2006
229 Posts
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Thunder Tiger Imagine 50 Electric Conversion

Hi ,
I have decided to go electric with the TT Imagine 50 planning on the following set up :
http://www.thundertiger4u.com/thunde...153fd6d523034e

1) Tower Pro 3520 6T-10 OBL.
2) Turnigy Plush 60 amp ESC with 3 A Built In ESC
3) 2x 7.4V 4300 mah Zippy Lipo battery .

I had my doubts it would be a shade underpowered.

Sai
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Old Jan 16, 2009, 07:18 AM
jrb
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Edina, MN, USA
Joined Oct 1999
11,430 Posts
Might; how many amps can you get out of those LiPos?

Mostly used 5S LiPo on my .46 conversions; got them all on A123-6S now.
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Old Jan 16, 2009, 10:03 AM
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Oakland township, Michigan
Joined Jun 2005
731 Posts
Sai,

I think that you might be a shade underpowered with that set-up unless you expect to pull somewhere between 45 to 50 amps out of the battery. I am assuming that you will be needing about 650-700 watts of power in order to get "pattern like" performance out the plane. In my case I am using a geared motor with an effective Kv of about 460. The motor you are proposing to use has a kv of 700. Even on a 4S pack, the Kv might be a little too high to turn a 13 or 14 inch prop without pulling an inordinate number of amps.

I have a very similar airplane of my "own design" which weighs about 5.5 lbs; initially I flew it on 550 watts but later decided to change the prop which increased the power to 650 watts. I flew well at 550 watts, but I definitely like flying at 650 watts quite a bit more. That particular plane flies on a 5S pack. I did a very short thread on it in case you are interested:

http://www.rcgroups.com/forums/showt...t=frankenresti


This model currently flies on a 14x12 prop which makes it perform better than when it had a 13x10 prop.

Good luck,

Teo
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Old Jan 16, 2009, 10:26 AM
jrb
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Edina, MN, USA
Joined Oct 1999
11,430 Posts
Have flown my FreeStyle via: 16xNiXx, TP4200-5S2P, & A123-6S (RTF 5# - 10oz, 1.5# less than 16xIB4200). Currently have a geared Mega 22/20/3E with Kv @ prop of 368 and use 15x10 – great performance!

Wing Span: 55 inches
Wing Area: 700 square inches
Length: 54 inches
Engine: 46 Two Stroke, 61 Four Stroke
Radio: 4 channel with 5 servos (computer radio recommended)
Weight Ready to Fly: 5-5.5 pounds
Wing Loading: 16.5 to 18 ounces per square foot
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Last edited by jrb; Jan 16, 2009 at 10:38 AM.
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Old Jan 16, 2009, 10:27 AM
Xtreme Nut
Kuala Lumpur, Malaysia
Joined Oct 2005
2,046 Posts
With the right motor you will not be underpowered on 4S. I have flow 5S set ups on a 40 sized plane and with the right motor we are talking UNLIMITED verticals.

I think you set up will be fine on 4S with that motor. I tried the DualSky 4260-5 (680KV) and that on 4S will be pretty decent when turning something like a 14x10 pulling around 60A. On 5S and a 12x10 its amazing!
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Old Jan 16, 2009, 09:51 PM
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Madras India
Joined Aug 2006
229 Posts
Hi All ,
Thanks for the quick replies , I have this set up already in hand from a discarded Plane .
From the replies it looks like this set up might do the Job with a bit of experimenting on props and changing to 5 S.
Hence there seems to be no harm in trying what is in hand before investing in a new set up.
Thanks once again
sai
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Old Jan 17, 2009, 06:49 AM
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Oakland township, Michigan
Joined Jun 2005
731 Posts
Sai.

I was thinking about what I said before and after looking at the motor specs it appears that it is good up to 50 amps. With that in mind, I would experiment with 13 or 14 inch props to see which one makes the motor pull about 45 amps and see if at that current level you have adequate power. Don't buy a 5S pack just yet. The reason for suggesting 45 amps as the limit is simply to give yourself a little bit of margin. I am assuming that you have access to a whattmeter. Keep in mind that pitch speed is also important, so you may want to try relatively high pitched props say 12x8, 13x8, 13x10 (better) and maybe a 14x10, although I suspect that with the later you will exceed the 50 amp limit on the motor.

Good luck,

Teo
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Old Nov 03, 2013, 08:10 PM
rip
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United States, FL, Niceville
Joined Jan 2013
1,655 Posts
Another conversion....

http://www.rcgroups.com/forums/showthread.php?t=2029279
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Old Nov 04, 2013, 11:45 AM
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United States, ID, Shelley
Joined Dec 2011
445 Posts
Here's the process I use for electric power systems. Might help confirm your set-up idea.


Step 1: Determine your models weight. Most all of the conversions I’ve been involved with come out slightly lighter than the glow powered version, so the listed weight on the kit box should be adequate.

Step 2: You can determine the power requirements of a model based on the “Input Watts Per Pound” guidelines found below, using the flying weight of the model (with battery):

• 50-70 watts per pound; Minimum level of power for decent performance, good for lightly loaded slow flyer and park flyer models
• 70-90 watts per pound; Trainer and slow flying scale models
• 90-110 watts per pound; Sport aerobatic and fast flying scale models
• 110-130 watts per pound; Advanced aerobatic and high-speed models
• 130-150 watts per pound; Lightly loaded 3D models and ducted fans
• 150-200+ watts per pound; Unlimited performance 3D models

Step 3: Divide the total desired watts by battery voltage to determine necessary amps.

Watts / Voltage = Amps

Step 4: Determine the Voltage to /Currant ratio by dividing the given Amp by the Voltage.

Amps / Voltage = V/C Ratio

Voltage/Currant ratios should be fairly low; 2 or 3 to 1 being ideal.

Examples: 900w / 11.1v = 81a 7:1 ratio
900w / 14.8v = 60a 4:1 ratio
900w / 18.5v = 48a 3:1 ratio
900w / 22.2v = 40a 2:1 ratio

Step 5: Determine the battery discharge rate (C-rating) by divide the desired Amps by the battery
pack capacity, expressed in Amps (A).

Required amps / Capacity (A) = C-discharge rate

Example: 40amps / 4 (4,000mAh) = 10C

Step 6: Determine the Max. full throttle flying time, full discharged battery time by dividing 60
minutes by the C-rating.

60min / C-discharge rate = Max. full power time

Example: 60min / 10C = 6 minutes

Step 7: Determine the 80% discharge flying time by multiplying the Max time by 0.8.

Example: 6 minutes x 0.8 = 4.8 minutes.
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Old Nov 13, 2013, 08:25 AM
rip
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United States, FL, Niceville
Joined Jan 2013
1,655 Posts
Very good info ddemu
My yoshioka imagine 50 should fly this weekend yay!

http://www.rcgroups.com/forums/showthread.php?t=2029279
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