RE: 1/8 scale Hyper 7 PBS brushless conversion:

RE: 1/8 scale Hyper 7 PBS brushless conversion:
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RE: 1/8 scale Hyper 7 PBS brushless conversion: - 2/15/2005 4:38:44 PM

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It was and still is. ROLF. This thread is about twins, so it aint Hijacked.

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RE: 1/8 scale Hyper 7 PBS brushless conversion: - 2/15/2005 4:49:41 PM

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Huuuuhh,,Twins??
I only see one twin in the whole thread???
What's in the water over there?
I thought it was about Kieths "1/8 scale Hyper 7 PBS brushless conversion"
I guess I missed something

Come on where's the link to the crash??
Put it on Rcpics for all to see,,please

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RE: 1/8 scale Hyper 7 PBS brushless conversion: - 2/15/2005 5:13:56 PM

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quote:

ORIGINAL: Uberchav Alex

A HNC in Engineering. Is that high enough for you. Ofna never built a thing. They distribute, thats what distributors do. Ho Bao made the Twin Titan. Some simple things you should know there. My time was not wasted and ATM I am remanufacturing the chassis as that is just a prototype in the pic.

Please show me your maths. I have made 2 * 0.26ci = 0.52ci. I'm intrigued to see what you make IT! and I was being consvative in the figures.

Easy now Alex - I was actually trying to defend your twin-engined buggy by showing that the configuration isn't technically impossible.
And of course I know that Ofna doesn't build, but only distributes. I tried not to make it to complicated for Adam_fozz to understand!

< Message edited by studysession -- 2/15/2005 6:12:30 PM >

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RE: 1/8 scale Hyper 7 PBS brushless conversion: - 2/15/2005 6:14:09 PM

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I would think with twin engines that the buggy would accelerate much faster. I am not sure about the top end though.

With brushless it is hard but not impossible to get the timing right to use a dual brushless system. If you use a dual brushless system it is best to use 2 seperate brushless ESC's. Do not try connecting 2 motors to 1 ESC. Just worth the risk of blowing up the ESC.

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RE: 1/8 scale Hyper 7 PBS brushless conversion: - 2/15/2005 8:16:51 PM

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My HO on twins,,
I had a couiple twin engine airplane models
getting the engine to turn the same through the rpm range was near impossible. and that's with a Tacometer to aid me,,,it was easier just to tune the top end by ear, you could never get them to turn the exact same rpms,,
How you would tune them in the car i think would just be the same,, if one engine is less rpm it would just pull the other engine down and vis versa,,

The only advantage I can see it the ability to run much larger clutch bell gears to take advantage of the added torque,,, then the extra gearing will help you on top end
Grunt grawl, boom into the curb,,, gotta love it,,post vid

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RE: 1/8 scale Hyper 7 PBS brushless conversion: - 2/15/2005 11:18:45 PM

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You just have this tunnel vision of what you think is right and thats it. I, like keith have decided to vary things and experiment. We would deffo still be in caves with your (lack of) ideas.

The basic theory in my twin is that 2 engines will have a better power to weight ratio. So 2 engines = more torque = more acceleration = more power to overcome drag = more top end.

The only extra weight is an engine and fuel tank. So I have 2 engines trying to push 1.2ish buggies worth of weight. They should rev higher as their is less drag on them each and thus give a higher top speed. The Titan twin was geared down to lose the speed gain BTW.

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RE: 1/8 scale Hyper 7 PBS brushless conversion: - 2/16/2005 1:22:54 AM

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Dude is it possible for you to have a discussion with someone with a different point of view than yours without you insulting them?

If you read my post I conceeded that it would have more torque and said with the right gearing it would have top end benefits, it's just that synchronizing the engine in a twin is difficult in my experience with planes. I was just offering for discussion that the same problem might exist in a twin engine car.

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RE: 1/8 scale Hyper 7 PBS brushless conversion: - 2/16/2005 5:15:22 PM

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Single LiPol packs cannot be safely used on a brushless motor setup. Most LiPols can only be discharged at 8-10c ( that is 8-10 times it's rated capacity. ) The brushless systems in these vehicles will routinely pull 100+ amps of current. If you try to run a single LiPol pack, you will risk a fire in your vehicle. The only way to safely run Li-Pol packs in a vehicle is with multiple packs in parallel, with their combined discharge rate being greater than the amperage draw of the motor and ESC. The real gotcha is that most LiPol packs start at $140 each and go up from there. It can be done, but it is not economical.

Another consideration is LiPol's can only be charged at a rate of 1c. A high capacity LiPol will require several hours of charging, per pack. Again, it's not economical.

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RE: 1/8 scale Hyper 7 PBS brushless conversion: - 2/16/2005 6:12:45 PM

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quote:

ORIGINAL: SkrapIron
Another consideration is LiPol's can only be charged at a rate of 1c. A high capacity LiPol will require several hours of charging, per pack. Again, it's not economical.

Can you further explain what you mean by this,,I'm not a battery expert
and have been thinking of trying LiPos

Do you mean 1c = 1 times capacity?
if that's true wouldn't lets say 3000mah pack charged @ 3amps take 1 hour to charge?
What am I missing?

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RE: 1/8 scale Hyper 7 PBS brushless conversion: - 2/16/2005 8:09:55 PM

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I know a few people in Germany that have done more brushless conversions than me and they use LiPo's in most of their conversion and try to talk me into doing the same.

Personally - I do not have the budget for the LiPo's that would be required for this. The LiPo's that are even close to being capable delivering the power that would be require cost way to much for me. I will stick with my GP3300's. One of my sponsors is getting the new GP3700's and will be shipping me some when they get them. I am not sure how long that will take though.

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RE: 1/8 scale Hyper 7 PBS brushless conversion: - 2/16/2005 9:02:37 PM

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You are right, Had enough. A 3000 mah cell would require at least 1 hour to charge. AND when you charge them, you have to do so in a FIREPROOF box. They can catch fire even when charging. Not cool! So to run it in an RC cr, you'd have to spend at least 2 hours charging your $140.00 a piece packs. You can get matched gp3600 for $80 each. That's alot of run time for not alot of coin.

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RE: 1/8 scale Hyper 7 PBS brushless conversion: - 2/16/2005 10:22:04 PM

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I see, you are saying 1c max,,, but it's safre to use a lower charge rate,,, like .5c or lower

I agree Nimh are much better bang for the buck

By the way, I got to see one of those catch fire at the flying feild one day
It was a 600mah pack that was just waiting to be used, not being chargered or used at the time,, Not worth the risk to me

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RE: 1/8 scale Hyper 7 PBS brushless conversion: - 4/15/2005 4:22:32 PM

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Back to the original topic, that is the nicest 1/8th brushless conversion I have ever seen. It give me some good ideas. I'm working on a brushless savage right now, and a Hyper 7 too.

< Message edited by BL_Force -- 4/16/2005 2:52:42 AM >

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RE: 1/8 scale Hyper 7 PBS brushless conversion: - 4/15/2005 6:40:06 PM

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But it was pointless. A waste of magazine space (Maxbashing), A waste of a buggy and a waste of a motor/ESC.

The E-Maxx will still kick the behind off a brushless Savage, if you can get the savage to stay in one piece.

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RE: 1/8 scale Hyper 7 PBS brushless conversion: - 4/15/2005 7:04:28 PM

Chex

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hey...he built it for himself coz he likes electric better - you cant buy a 1/8th electric buggy so he built one, how was that pointless?

If what he did was pointless then you twin hyper is pointless too and so is any RC ever built.

People get into the hobby for different reasons jus coz he aint doin what you like doesnt make it pointless Mr. 'we would deffo still be in caves'

< Message edited by Chex -- 4/15/2005 7:05:54 PM >

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RE: 1/8 scale Hyper 7 PBS brushless conversion: - 4/16/2005 2:51:01 AM

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quote:

ORIGINAL: Uberchav Alex

But it was pointless. A waste of magazine space (Maxbashing), A waste of a buggy and a waste of a motor/ESC.

The E-Maxx will still kick the behind off a brushless Savage, if you can get the savage to stay in one piece.

LOL, your not going to get a rise out of me that easy. Every reply I have read from you is some smart**** remark. If you have nothing constructive to add to the topics, then I and everyone else would prefer you keep your comments to yourself.

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