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Old 12-20-2011, 10:16 AM   #2896
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Default OFNA Late Model Oval vs. GTP2e

Why is it preferable to use the GTP2e over a OFNA Late Model Oval for onroad?

My reasons for liking the Oval version is:
  1. Price
  2. Front and rear pillow ball suspension
  3. Lower profile rear shocks and shock tower

Is there something about the GTP2e that makes it more suitable for onroad aside from the included Protoform body?
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Old 12-20-2011, 11:29 AM   #2897
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Quote:
Originally Posted by YR4Dude View Post
Why is it preferable to use the GTP2e over a OFNA Late Model Oval for onroad?

My reasons for liking the Oval version is:
  1. Price
  2. Front and rear pillow ball suspension
  3. Lower profile rear shocks and shock tower

Is there something about the GTP2e that makes it more suitable for onroad aside from the included Protoform body?

That true you get the rear pivot ball suspension but now you have a body that can't be use.
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Old 12-20-2011, 11:49 AM   #2898
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What motor would you guys suggest for a parking lot track with a 160 foot or less back straight?
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Old 12-20-2011, 12:18 PM   #2899
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Quote:
Originally Posted by YR4Dude View Post
Why is it preferable to use the GTP2e over a OFNA Late Model Oval for onroad?

My reasons for liking the Oval version is:
  1. Price
  2. Front and rear pillow ball suspension
  3. Lower profile rear shocks and shock tower

Is there something about the GTP2e that makes it more suitable for onroad aside from the included Protoform body?
Yeah, I'd go with the late model if you're willing to buy another body. I converted my dm-1 to shorty rears and they work well and there's some weight savings!
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Old 12-20-2011, 12:48 PM   #2900
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Default 4S charging

Okay, I thought I was just gonna pick up a 4s pack and throw it on my current charger for 2s batteries and thats it. Just checked the specs and it says I can only charge at 4A with a 4s pack. With a 5000mah pack that works out to about 1 hour and 15 minutes. No biggie but, how much charge do these things use in a normal 5min qualifier?

If it uses the whole 5000mah then its a pain to pump it back up in time for the next heat. If its only about 3000mah used then that's not so bad.

How do you guys manage your charging to stay in pace with the race schedule? Having more packs is nice but can get awful expensive. Are there any special chargers you guys use that get these 4s packs charged quicker?
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Old 12-20-2011, 12:56 PM   #2901
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Quote:
Originally Posted by YR4Dude View Post
Okay, I thought I was just gonna pick up a 4s pack and throw it on my current charger for 2s batteries and thats it. Just checked the specs and it says I can only charge at 4A with a 4s pack. With a 5000mah pack that works out to about 1 hour and 15 minutes. No biggie but, how much charge do these things use in a normal 5min qualifier?

If it uses the whole 5000mah then its a pain to pump it back up in time for the next heat. If its only about 3000mah used then that's not so bad.

How do you guys manage your charging to stay in pace with the race schedule? Having more packs is nice but can get awful expensive. Are there any special chargers you guys use that get these 4s packs charged quicker?
You wont being using all 5000mah, that would go well below LVC.
I use a hyperion 14201 net 3 charger , and gensace 5000 4s, they can be charged 2c,the charger is onsale from $180 down to $130 at allerc.com
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Old 12-20-2011, 01:29 PM   #2902
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Originally Posted by Joat View Post
You wont being using all 5000mah, that would go well below LVC.
I use a hyperion 14201 net 3 charger , and gensace 5000 4s, they can be charged 2c,the charger is onsale from $180 down to $130 at allerc.com
Okay, I checked the spec sheet for it and it says I need a 24V input? My power supply only has 12V with a maximum of 9A, will that do?

Even if I charge at 8A which is less than 2C thats not so bad but do I need 24V?

EDIT:

Okay, I saw this and it sounds like a great deal considering its price and charge rate.
http://www.hobbypeople.net/index.php...a-output.html#
If anyone has any experience with this charger please comment.

Last edited by YR4Dude; 12-20-2011 at 01:47 PM.
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Old 12-20-2011, 02:16 PM   #2903
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FWIW, my charger only charges lipo at 1C. I have a 2050KV motor in my GTP2e and use about 2600ish ma in 5min. I have two cheap 4500ma packs, charge up the night before. Use pack A for Q1, charge A for main (at the track), use B for Q2.

I run 2 classes and it does not get in my way.
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Old 12-20-2011, 02:55 PM   #2904
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Originally Posted by Micro-E View Post
FWIW, my charger only charges lipo at 1C. I have a 2050KV motor in my GTP2e and use about 2600ish ma in 5min. I have two cheap 4500ma packs, charge up the night before. Use pack A for Q1, charge A for main (at the track), use B for Q2.

I run 2 classes and it does not get in my way.
Thanks. Thats exactly the information I was looking for.
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Old 12-20-2011, 02:56 PM   #2905
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Quote:
Originally Posted by YR4Dude View Post
Okay, I checked the spec sheet for it and it says I need a 24V input? My power supply only has 12V with a maximum of 9A, will that do?

Even if I charge at 8A which is less than 2C thats not so bad but do I need 24V?

EDIT:

Okay, I saw this and it sounds like a great deal considering its price and charge rate.
http://www.hobbypeople.net/index.php...a-output.html#
If anyone has any experience with this charger please comment.
Its really up to you, it should handle fine, my 1420 is 550watt 20 amps output,I bought a cheap 28v power supply, this way I can charge up to 14s,which may seem like overkill, but I can charge 2 x 7s at the sametime,but for me ,2 x 4s ,5000mah is more then enough for me to charge at 1 time.
I wanted a charger that could handle charging 2 different packs at the sametime.
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Old 12-20-2011, 04:56 PM   #2906
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Default My conversion nearly done ,teaser pics

My conversion is almost done, heres some tease pics of the parts I made.
Aluminum is 7075,and Titanium 6ALV4
I have a older gtp, with a 4mm cnc option chassis ,converting to BL
Sorry but this is my first attemps at using my mill , no cnc

Motor mount



Stand up servo mount



DM1 bumper adapters ,titanium


I'll let you guess what these are for



Next up carbon parts, I cut on my mill,




I went cheap and used abs sheet to make a battery tray
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Old 12-21-2011, 12:45 AM   #2907
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Quote:
Originally Posted by Micro-E View Post
FWIW, my charger only charges lipo at 1C. I have a 2050KV motor in my GTP2e and use about 2600ish ma in 5min. I have two cheap 4500ma packs, charge up the night before. Use pack A for Q1, charge A for main (at the track), use B for Q2.

I run 2 classes and it does not get in my way.
Ditto!
How u been Erik?

Last edited by RC Passion; 12-21-2011 at 11:34 AM.
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Old 12-21-2011, 12:55 AM   #2908
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Originally Posted by Stregone View Post
What motor would you guys suggest for a parking lot track with a 160 foot or less back straight?
Go for a 2050 or 2250kv motor! Anything more you'll be plowing thru the end of the straight! I've seen some do this even in an almost 200ft straight! I wont name names.... Not a pretty site!
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Old 12-21-2011, 08:43 AM   #2909
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Default Charge rate

Okay so for 5min the typical mah used is about 3000mah. If I throw it on a charger that allows for a maximum of 4A with 4s packs would it be charging it at 1.3C for the 3000mah I need to put back in the pack? Or is that 4A only apply to its full capacity when at 5000mah which works out to .8C?
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Old 12-21-2011, 09:35 AM   #2910
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Quote:
Originally Posted by YR4Dude View Post
Okay so for 5min the typical mah used is about 3000mah. If I throw it on a charger that allows for a maximum of 4A with 4s packs would it be charging it at 1.3C for the 3000mah I need to put back in the pack? Or is that 4A only apply to its full capacity when at 5000mah which works out to .8C?
Why are you charging only at 4amp. A 5000mah pack you should be charging at 5amp.
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