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Avistar conversion

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Old 08-01-2004, 03:12 PM
  #1  
3dandpatternflyer
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Default Avistar conversion

My dad is at it again. He is converting an Avistar to fly on a brushed car motor. He really likes using that whatt meter I got him for his B day last month. For best results on this type of conversion see Guapoman2000's conversion on RC groups http://www.rcgroups.com/forums/showthread.php?t=215044 He is an inspiration to us all

Whatt my dad is using, or is that what he is using.

Avistar .40 Trainer
Peak Performance Panther 17x2 Brushed car motor
GP 3:1 GB
12x8 and 14x7 props
8 Cell Electrifly 1900 SCR pack
30 A Electrifly SP control
GWS 4 CH reciever
2 standard Servos elevatror and alierons
HS 81 MG for rudder
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Old 08-01-2004, 04:00 PM
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Default RE: Avistar conversion

my dad lives in Sebring 85 miles south and has already finished the plane. Here are some pics.
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Old 08-01-2004, 04:10 PM
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Default RE: Avistar conversion

Whatt meter shows 228 whatts 32 Amps on 8 cells with 14x7 APC prop. He will test fly it tomarrow or later in the week. He says he had to change to a Griffen 55 and a seperate Rx pack to get four min of run time the GP SP control was cutting out from the heat. The Griffen Bec couldn't handle the 2 full size and HS 81 and kept cutting out. Weight just under 5 lbs.
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Old 08-01-2004, 04:26 PM
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Default RE: Avistar conversion

more pics
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Old 08-01-2004, 04:30 PM
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Default RE: Avistar conversion

Peak performance car motor
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Old 08-01-2004, 04:37 PM
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Default RE: Avistar conversion

Ready for a test flight. Flew on ten cells with good rate of climb but cut out too soon on the GP C-30 SP controller. Switched to a Griffen 55 and 8 cells. Testing it later.
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Old 08-04-2004, 11:23 AM
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Rain is keeping me grounded







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Old 08-05-2004, 03:12 PM
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Default RE: Avistar conversion

Hey everyone,


Flew the Avistar today at 0800. The take off roll was a little longer than expected but it got in the air. I flew it for they projected four minutes. I was able to do three loops and one roll. The plane lost too much altitude in the roll and I waited too long into the 4 minutes too try another. The landing was un eventfull. I have only one 8 cell pack so I flew the E-Magic for a while then trimmed some trees at the end of the field. I planned to try a 10 cell pack later on today since I'm off, but it started raining as soon as my 10 cell pack got charged. Rain all summer and blow all winter.


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Old 08-07-2004, 02:14 AM
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Default RE: Avistar conversion

Trust me on this one. Use the Jeti 30-3 and an apc 11x5.5 prop. Draws 34 amps all day long at full throttle. It made my avistar nicely aerobatic at 75% throttle.

John
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Old 08-07-2004, 02:22 PM
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Default RE: Avistar conversion

JJP

Thanks for the advice. I did the Avistar/Jeti conversion about 2 years ago. It was my first glow conversion. It was great. I just want to see if I can make a good glow conversion with a brushed motor. I had an old speed 700 motor in it to start but it burnt up on the 2nd flight so I am now trying a car motor. My Jeti has been in 4 different planes. It is now DD in my Modletech .25 Extra 300.








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Old 08-08-2004, 10:21 AM
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Default RE: Avistar conversion

Hey Guys!!!

My son set me up my own screen name. I don't have to intrude on his space anymore.

I got off work a 0300 this am and couldn't sleep so I did some static testing on my Brushed Avistar conversion. With 12 volts of 3600 mahs, thats two 1800mah Hecells 10 packs. W 14x7 prop the thing was too hot at 49Amps and 393 watts. With a 12x8 it was doing 42 A and 363 watts. Test flying tomarrow if I can beat the weather.



Thx son


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Old 08-09-2004, 04:44 PM
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Bad news


Burnt up a second Panther 17x2 car motor on this conversion. Both times after runinng for about 3 minutes when using 10 cells. No problems on 8 cells just low power. The brushes look good , but the motor is extremely hot and tight to turn. After cooling for an hour I tried it again and it ran for about 15 secs then cut out and was already hot. Some times it won't even turn. A friend says it smells like the armature is burnt. Endoplasma and 3.8:1 here I come.

I'd go back to brushless, but what would I do with that $75.00 Griffen.


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Old 08-10-2004, 06:00 PM
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Default RE: Avistar conversion

GUYS

I had to go to Orlando this am to take a test for my job. The toughest test I have ever taken. Good news is that I passed. I hope I get a raise. To celebrate, I went to Graves RC and bought a Endoplasma motor for my project. They matched the $19.99 TH price. I also picked up a 12T pinion. They did not have any 10T's. Got home in time to change out the GB and get in a test flight an hour ago. A slight breeze was coming from the up hill side of the runway and the take off roll was 50 feet or more. The grass strip is very wet. Eight cell climbout with 12x8 prop was okay but not as good as I had hoped. Flew for about 5 minutes then came in for a splash down, I mean landing. Motor was not that hot and no cut out problems. I want to try a 14x7 prop on the weekend when my son is here. I'll post more pics then.


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Old 08-20-2004, 04:08 PM
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Default RE: Avistar conversion

Guys

I survived the hurricane. The fields safety fences did not. After fixing three of them this morning, I took time to fly the Avistar with the 14x7 prop. Wonderful!!! It got off of the ground much quicker and was able to loop, roll and sustained inverted flight. The power set up is just right. About eight minutes of mostly WOT w/3600 Mah of eight cells and the Endoplasma motor.

Gate leftovers


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Old 08-23-2004, 02:54 PM
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Default RE: Avistar conversion

Guys


I had a lot of fun and frustration with this conversion. Trying to use a motor other than the $25.00 Endoplasma was costly. I burnt up two Panther peak performance armatures at $20.00 each. I had to buy a different speed controller than I started with. Add $75.00. I had to buy higher capacity batteries. Add $50.00. The plane was free from a friend Lance at the FF. Total $170.00. If I had bought a Brushless motor from MEC or Cermark for around 100.00 and used the Jeti 40A controller I already had setting on the shelf. $50.00 from HL, I could have used the batteries I already had and saved some dough. BRUSHED is not always cheaper!!!!!!!!!! But I already Did that conversion 2 years ago.


In the end it worked and I am the only one at the field flying a big plane on a brushed motor!!!!

StephenT


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Old 09-30-2004, 06:48 PM
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Guys



Best up grade ever. I went to a 9 cell pack and the climb rate was much better. Loops, rolls and inverted flight was much easier. Who would have thought 1.2 Volts could be so good.
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Old 10-11-2004, 03:11 PM
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well well welll!!!!

I forgot to mention this little piece!! I noticed when I made a 9 cell pack by adding a cell to my 8 cell pack that I had one of the cells reversed in line. This means I was flying on 7 cells or 8.4 volts instead of 9.6 volts, 8 cells. I corrected it and added a 9th cell. Great preformance.
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Old 10-12-2004, 07:44 PM
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guys



I have been flying my Avistar on 8 or 9cell 1900 SCR Nicads and getting 4-5 minutes. Tomarrow I will Try a 9 cell 3000 nimh packand a 10 cell 1950 nimh 40 Amp capable pack.


Bill, See you at the Field!!
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Old 10-22-2004, 03:49 PM
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Guys


I tried the 9 cell 3000 nimh pack. They were Radio Shack batteries and could not take the Amps. They were way too hot at the end of the flight and only lasted 5 minutes. GP 3300's here I come.
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Old 11-07-2004, 09:47 AM
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Hello
i converting my hobbiestar 40 over and i am interested in what you find on final set up to make it fly.
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Old 11-07-2004, 09:48 AM
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Hello
i converting my hobbiestar 40 over and i am interested in what you find on final set up to make it fly.
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Old 11-08-2004, 09:39 AM
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Nova

Read the whole thread first!!!!
Follow the setup above or the brushless system I suggest earlier on your thread and you will get good results. Level flight, loops, rolls and inverted are possible Since a Superstar has a flat bottom wing, you should have better flight stability. Don't cheap out on Radio Shack or Epic 3000 Batteries. They will work on the Brushless system(32 Amps) but the Brushed Endoplasma (40 Amps)Motor pulls too many Amps for the low priced power source. You need to go with GP3300 Nimh(8 min) or GP1900SCR(4 min) rated at 40+ Amps. Clean the brushes and commuter often. If I had it too do over again I would have gone brushless first. Read the thread. Don't cheap out!!!
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Old 11-08-2004, 07:42 PM
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ok
you say go brushless what motor would you suggest. for me to use ? new to electric need all the info i can get!
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Old 11-09-2004, 02:15 AM
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Default RE: Avistar conversion

Nova use a Jeti 30-3 motor from Hobby lobby with a 10x6 or 12x4 prop plus an adaptor. A 40-3 controller and a 10 cell 3300 Nimh battery. You should get 10 minute flights.
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Old 11-23-2004, 04:42 AM
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Well


I did it, I over amped my 1900SCR 9 cell pack. It only lasts about 2 minutes now down from the former 5 minutes. I am going to get some GP3300 's and expect 7-9 minutes.
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