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Old 08-07-2011, 08:53 PM   #1
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Smile SIG Kadet LT-40 Glow-To-Electric Trasnformation!

Hi Guys!

Just opening this thread to document my GLOW-to-ELECTRIC conversion of one LT-40 ARF that was placed at my RC Club's FREE PICKUP TABLE and I quickly took advantage and brought it home. Therefore, you might say that I save it from the Trash Bin of sorts.

First, I had to get the 409 spray bottle and clean off all the slime from all areas of this model and make it smell better as it had perhaps several years and flights with GLOW powered IC Engines and it seems like the previous owner did not believe in cleaning.

Well, here is a picture of the model that I have as my present project:

For additional Specifications:
http://www.sigmfg.com/IndexText/SIGRC67ARF.html

Finally, here is the Power System that was applied:
the ASTRO FLIGHT 60 Cobalt Direct Drive Brushed Motor:

STOCK No. 662
Winding 13-Turn #24
Max Cells 32 (Round, such as Ni-Cd, Ni-MH)
Max Current: 30-AMP
Power: 1,200 WATTs
Speed: 7,500 RPMs
Designed for Large Models

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Old 08-07-2011, 08:57 PM   #2
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Default Power System Thoughts

After many thoughts on the matter, I decided to use some power systems that I have had on hand for a number of years and still in very good condition. Since this "is" a "LARGE" trainer, I concluded that using a quality motor such as the ASTRO FLIGHT 60 Cobalt direct drive motor as the motor of choice will do well on this model as it has 900 sq.-in. of wing area and the style of flying will be exactly "Trainer" manner all the way.

Another reason for the selection to the ASTRO FLIGHT 60 Cobalt is the tremendous Tail Boom Weight that this model exhibits and the only motor that I have on hand to OFF-SET all this Tail Boom Weight was the AF 60 motor! Checking the Center-Of-Gravity, with the projected battery type and amount of cells the Center-Of-Gravity will be right on the mark without adding any Lead Dead Weight what-so-ever.

A few pictures of the power system:









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Old 08-07-2011, 09:00 PM   #3
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Thumbs up Astro flight 204d esc

I got about 4 ASTRO FLIGHT Brushed ESC's and several ASTRO FLIGHT "Brushed" Cobalt motors so, I will be taking advantage of them now that I have a large Trainer on my hands!

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Old 08-07-2011, 09:04 PM   #4
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Thumbs up Transmitter, Receiver and Servos!

Found a used but, in excellent condition Futaba Skysport in almost brand new condition:


and, last night and using a 5-Cell, Sanyo, 2500mAH, Ni-MH, Receiver Pack and switch harness I was able to make this transmitter work with the 7-Channel Futaba Receiver:




All channels worked and using Futaba 3000 servos and Hitec 311's




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Old 08-07-2011, 09:13 PM   #5
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Thumbs up Build Pictures and Information

Okay, first some "BUILD" Assembly pictures:








Discovery of Lead Weights!



Removal of Lead Weights!



Astro Flight Connectors Securing






Receiver and showing the RF Choke



APC "E" 13 X 8 Propeller
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Old 08-07-2011, 09:18 PM   #6
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Thumbs up Topping Off Flight Batteries & Receiver Pack!

Some Charging, Topping Off Batteries!













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Old 08-07-2011, 09:23 PM   #7
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Smile Selection of Flight Battery, some thoughts!

At first I was serious considering 9S1P using some generic 3-Cell, 5000mAH, 12C discharge, Li-POLYs but, the weight of almost 3lbs. was just too much! Sure could use the Voltage, however....so, I continued to look for other alternatives.

The heavy are the ones in RED Covering:



Decided on these for my First Flight Batteries as these 2600mAH cells are just 1lbs. and 3oz. in the 8S1P configuration!




These are my 2nd Flight Batteries and they are even lighter, still in the 8S1P configuration!

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Old 08-07-2011, 09:29 PM   #8
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Talking Maiden Flight Summary and Pictures!

FLIGHT SUMMARY:

The model taxi off with the Esprit Models (EM) Sport 2600mAH Cells in the 8S1P configuration and it was commanded to turn into the wind and down field. I stopped the model and got my nerves to relax and I should have known that this model is one exactly what the Doctor ordered as it was commanded for FULL Power, a little slow as the Grass field was very WET as we had lots of Fog early this morning and about 35 feet later and still going slow, I commanded UP Elevator and it gently lifted off like a giant SLOW STICK!

Once it was in the Air it gained very good Airspeed with the 13 X 8 propeller and I was able to throttle back about two clicks above 1/2 Throttle. At 3/4 Throttle I was able to command the model to perform very nice loops, rolls, and hammer heads without any issue or events.

Landings are just something to see for this Ton Tossy (estimate fully flight ready weight at right at 7.5lbs. or 8lbs. As I commanded the model to glide in completely DEAD STICK and it kissed the top of the grass blades on a slight UP Elevator command and resulted with the mains to touch down first.

For about 5 Minute flight those EM Sport 2600's came ICE COLD and the ASTRO FLIGHT 60 Cobalt was Luke Warm to the Touch and I could keep my hand on the motor casing without any problem.

The same with the smaller 2200mAH Cells from China!

A few post flight results and wide angle pictures of the model after it's mission flights over Central Florida!

I can very well fit one (5-Cell Pack) and another (4-Cell Pack) for a total of 9S1P for additional Propeller RPMs but, I really enjoyed the manner in which the model flew today so, I will keep her with the 8S1P configuration for a while and use new batteries and double check for fully charge state.
















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Old 08-07-2011, 09:34 PM   #9
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Thumbs up 3rd Flight of the LT-40

Here are the pictures from Gerry!

Thank you Gerry!













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Old 08-07-2011, 10:00 PM   #10
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Default

Originally Posted by guapoman2000 View Post
Hi Guys!

Just opening this thread to document my GLOW-to-ELECTRIC conversion of one LT-40 ARF that was placed at my RC Club's FREE PICKUP TABLE and I quickly took advantage and brought it home.
I want to join your club!!

Looks like a fun project. I also have a penchant for big trainers. So, do I understand correctly that you already had the brushed motor?
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Old 08-07-2011, 10:16 PM   #11
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Default

Originally Posted by Turner View Post
I want to join your club!!

Looks like a fun project. I also have a penchant for big trainers. So, do I understand correctly that you already had the brushed motor?
Tuner,

Why yes, come by and say hello and you can join. The Club dues has been $50 per year since I have been a member since 2002.

Yes, the ASTRO FLIGHT 60 Cobalt Direct Drive powered my large 80+ inch wing span MidWest Citabria before it got into this LT-40.

Carlos
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Old 08-07-2011, 10:24 PM   #12
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Default In-Flight Pictures, thanks to Gerry!


































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Old 08-07-2011, 10:31 PM   #13
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Thumbs up More In-Flight Pictures!

A few more pictures!




























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Old 08-07-2011, 10:35 PM   #14
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Originally Posted by guapoman2000 View Post
Tuner,

Why yes, come by and say hello and you can join.
Thanks but the travel would kill me. No one ever leaves anything quite so nice for the taking at my club. Or maybe I just never get there in time.
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Old 08-07-2011, 10:38 PM   #15
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Smile Landing Pics!

Landing Pics!





















Cheers!



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Old 08-07-2011, 10:43 PM   #16
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Smile Power System Evaluation

I believe that this represents a closer condition when both 4-Cell packs are fully charged and setup in SERIES with each other making a total of 8-Cells or 8S1P configuration.

Pretty impressive, this Monster Brushed motor in Direct Drive and Swinging the APC "E" 13 X 7 provides almost 80% efficiency while using 8S1P!

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Old 08-07-2011, 10:46 PM   #17
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Default Video of the 4th Flight of my SIG Kadet LT-40 Electric!

a weigh-in using a Digital Scale (not a cheap weight scale!) and the here are some results:

FUSE without any batteries: 5lbs. - 3oz.
Wing Assembly : 1lbs. - 12oz.
8S1P (2600mAH Cells): 1lbs. - 3oz.
Series Connector: 0lbs. - 3/4oz.
==========================
Fully Flight Ready: 8lbs. - 2 3/4oz.

Lets say that the steady state Watts "is" right around 400 Watts then,

400 W / 8lbs. = 50 Watts / lbs.

Some people say Watts "is" Watts but, this does not tell you the entire picture. Selecting a 13 inch diameter with a "8" pitch resulted in.....

Perhaps you all need to see the VIDEO?

http://www.vimeo.com/27375544
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Old 08-08-2011, 01:02 AM   #18
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Default

Originally Posted by guapoman2000 View Post
Hi Guys!

Just opening this thread to document my GLOW-to-ELECTRIC conversion of one LT-40 ARF that was placed at my RC Club's FREE PICKUP TABLE and I quickly took advantage and brought it home. Therefore, you might say that I save it from the Trash Bin of sorts.
Good to see that Astro motor put to good use. I've had grief with radio interference on my Astro motors in years gone by. (Got rid of the interference by putting toroid ferrite chokes on each motor lead.) Have now gone to the newfangled brushless Hacker motors, that outperform those Astro motors by quite a bit, and at the same time fly longer with the same battery pack.

In fact, still have two near brand new Astro motors, one Geared 25, and another geared 40, both have near zero time on them, and have never been used in an airplane, or anything else.

If interested in buying them, let me know, right now they're only getting stale inside my sealed plastic storage container. $30 each, plus shipping.

DennyV
Retired and the days are just too short, busier than ever!
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Old 08-08-2011, 02:13 AM   #19
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yes, I too have several ASTRO FLIGHT Cobalts in the Geared 40 and 25 sizes and mine are still in BOX in Brand new condition.

Unlike you, I will be using them on other projects that are waiting in the wing as I have matching ASTRO FLIGHT ESC's!
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Old 08-08-2011, 02:40 AM   #20
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Default

Originally Posted by guapoman2000 View Post
yes, I too have several ASTRO FLIGHT Cobalts in the Geared 40 and 25 sizes and mine are still in BOX in Brand new condition.

Unlike you, I will be using them on other projects that are waiting in the wing as I have matching ASTRO FLIGHT ESC's!
LOL
Back in the mid 1980's, I designed and built a number Microcontroller controlled brush type ESC's for my Astro motors. One of them controlled an Astroflight 90 running on 38 RC2400 Sanyo Nicad cells! Did a LOT of flying with them. It had automatic detection of low and full throttle settings, beeped the motor when each was setup, low battery power down, automatic rejection of any servo signal that was not correct, and a lot of other stuff.)

Even had a real little ESC that controlled one of those speed 400 brush type motors.


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Old 08-10-2011, 06:10 AM   #21
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Exclamation 9S1P 2200's Test Run!

Hi Guys!

As promised, I have carefully setup as best possible setup to measure all aspects of using 9-Cell, 2200mAH, 25C Discharge, Li-POLYs "or" 9S1P configuration.

Some pictures of the setup first,

Safety Tether:









Flight Battery TOP-OFF:
























NOW FOR THE VIDEO:

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Old 08-10-2011, 06:15 AM   #22
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Exclamation P-Calc

Lets See about my Trusty P-Calc Program....seems like the results are a little high...

ESTIMATED @ FULL POWER:

AMPs: 22.7 AMPs
WATTs: 583 Watts

Voltage
under
Load: 31.86 Volts

Efficiency: 80.5%

Prop RPMs: 8336 RPMs

Prop Pitch
SPEED: 63.1 MPH

Static
Thrust: 119.6oz. (7.5 lbs.)




==============================================

ACTUAL MEASURED DATA @ FULL THROTTLE:


AMPs: 16.45 AMPs
WATTs: 576 Watts

Voltage
under
Load: 35.86 Volts
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Old 08-10-2011, 06:18 AM   #23
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Thumbs up Analysis

It seems like by adding another Cell Li-POLY (another 4.15 Volts off-the-charger), I have effectively increased the overall capability of this power system as I have increased the Watts by 174 Watts additional!

Thereby, as previously posted, the fully flight weight (worse case) was:

8lbs. - 2 3/4oz. "or" 8.17lbs.

So,......

8.17lbs. / 576 Watts = 70.48 Watts / lbs.

I have effectively increased the Watt per Pound up another 20 Watts/lbs.

I am a true believer of HIGH VOLTAGE SYSTEMS from now on for the larger Models!
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Old 08-10-2011, 02:35 PM   #24
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Hmmm, maybe I should use 5S instead of 4S on my flightstar build...


Dave
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Old 08-11-2011, 02:04 AM   #25
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Thumbs up Videos at youtube

Guys!

Uploaded all the Videos associated with this project up at YOUTUBE so, you all can view easily right here!



4th Flight using 8-Cells Li-POLYs (2600mAH Cells):
http://www.youtube.com/watch?v=63EqU...feature=relmfu

Ground Testing using 9-Cells Li-POLY (2200mAH Cells):
http://www.youtube.com/watch?v=iyWTK...el_video_title
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