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Scorpion Power Scorpion Power
12-29-2009 09:37 PM  7 years agoPost 1
crash n' burn99

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ottawa, canada

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Ok im looking to save a bit of weight on the rad, I currently have a 3600 mah nimh which weighs 9.5 oz for electronics, I thought that if i switched to life or lipo i could save a lot of weight, I did a little looking around and a 3600 life or lipo seem to be around 5.6 oz then I need a reg which weighs around 2 oz, this brings it to 7.6 oz thats only 1.9 oz less, it seems very little weight savings for the cost, and i suspect the nimh will outlast the nimh.

For my ignition pack I thought about running lipo with a cc bec but to get the same run time as the 2650 duracells would give me it would weigh as much or more. Im not comfortable on running it on 1 cell lipo which could be lighter.

Anybody got a lighter solution, I am looking for something that I can fly atleast 5 tanks of fuel without recharging

Do proctologists chew there finger nails when there nervouse?

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12-29-2009 09:39 PM  7 years agoPost 2
BeltFedBrowning

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Kansas City

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you need a generator!

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12-29-2009 09:56 PM  7 years agoPost 3
crash n' burn99

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ottawa, canada

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yeah but it wont save me weight.

Do proctologists chew there finger nails when there nervouse?

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12-29-2009 10:04 PM  7 years agoPost 4
BeltFedBrowning

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Kansas City

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On my Mongoose I use a 1500 mah nimh AA size pack along with the generator. If I had enough gas I could fly all day. I'd bet the AA cells are much lighter than your 3600 packs which I bet are C or sub-C.

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12-29-2009 11:00 PM  7 years agoPost 5
James Kovach

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canton, oh - US

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If you want to save weight in your batteries, you are going to have to go the route of less capacity more batteries. What I mean is, instead of using 1 x 3600 for your RX and 1 x 2650 for your ignition, goto 1 x 1600 for the RX and 1 x 1600 for the Ignition. Just purchase 4 of those batteries. You will then have the same "capacity" on hand while flying, just not on your heli all at once.

Weight and Convenience are directly proportional when it comes to batteries. By that I mean, if you want to fly more on a single charge, more convenient, then you are going to increase the weight of your heli. If you want to decrease the weight of your heli, your are going to fly less per charge, less convenient.

EVERYTHING in this hobby is a Trade off.

*disclaimer: These are my opinions. Agree or disagree, Your Call :)
Let'r Rip Tator Chip

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12-30-2009 02:01 AM  7 years agoPost 6
rbort

rrProfessor

Franklin, MA - USA

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For those who might be interested to know

I just went down and weighted the dual output generator as follows:

Generator
Super bright Remote charge indicator LED
5.4v regulators x 2
blocking diode circuits
Coupler
And top mount bracket

Total weight, 5.4oz

Start shaft adapter removed from heli, weight is 0.4oz.

Added weight of dual output generator is a net 5oz.

You can use 3.6oz 1500mah NiMH NoBS batteries for backup, and your total power system weight will be 12.2oz.

This is for unlimited flying ready any day any time no charging required.

You can shave another 0.4oz by doing away with the LED which doubles as a headlight and a long distance generator working indicator. But I personally like seeing lights so the 0.4z is negligible.

But as Sparx says, its whatever floats your boat and keeps you happy. For me I'm out there to fly and practice my maneuvers, so batteries are one less thing I have to worry about.

Crash, just as an added note, with a 9.5oz electronics pack and an ignition pack which is probably at least 4.1oz my guess (AA size cells), you're a couple of oz's heavier now than my setup. You could save 6.4oz by going to two 1500mah packs and just take a field charger with you when you go fly.

-=>Raja.

MA 1005 Hanson 280, 4129 flts
Spectra 27 3DMax, 3187 flts
Whiplash V1 Hanson 300, 1425 flts
Whiplash V2 Hanson 300, 185 flts

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12-30-2009 03:39 AM  7 years agoPost 7
crash n' burn99

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ottawa, canada

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Raja that is awesome that is 2 ounces less than my current setup and no charging. When can I buy it.

Do proctologists chew there finger nails when there nervouse?

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12-30-2009 03:59 AM  7 years agoPost 8
James Kovach

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canton, oh - US

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I would be very curious to hear what your guys Radikals AUWs are... fueled and RTF.

*disclaimer: These are my opinions. Agree or disagree, Your Call :)
Let'r Rip Tator Chip

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12-30-2009 12:59 PM  7 years agoPost 9
Zman

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Florida

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I run a 2s 2100mah life pack to electronics, non regulated. I then run a 3.7 2000mah 1s2p 2000 to ignition. WOrks great and saves weight. Not worried about running more mah on life packs as I can recharge them in 10 minutes .

Z

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12-31-2009 03:14 AM  7 years agoPost 10
oldfart

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Vancouver, Canada

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Here is some food for thought, when considering different battery types, and their respective weights, for any particular application.

When dealing with anything electric, one must think in wattage (W = V x A) and when one is discussing power scources, one must also consider the current (C) cabability of the ones in question, not just think in volts or amps (mah).

For the discuusion following, I will assume 100% efficiency, just to keep it simple.

So, if one is comparing the power delivery potential of a battery scource, such as a 4.8V/3600 mah (3.7AH) pack. One should look at the wattage it can deliver, over a certain period of time, e.g at an average of a 2 amp drain.

For example, at this 2.0 amp drain, the wattage to operate the a system with a 4.8V pack, will be 4.8 x 2.0 = 9.6 watts. And, a 2.0 amp draw will result in a 100% drain of the 3.6 Ah battery in 3.6/2 = 1.8 hours

Now, if you need 9.6 watts from a 7.2V lipo, you would not have to use one with as high a mah rating. One will get 9.6 watts from a 7.2V battery with only a current draw of 1.33 amps, not 2.0 as above (9.6/7.2 = 1.33 amps). That is 67% of that of the 4.8V pack. So one would only need a 7.2V pack that has 67% the capacity. So 67% of 3600 mah is 2412 mah.

One will usually find that a similar "C" rated Lipo pack will vary in weight as a percentage also. So if the 7.2/3600 pack weighs 5.2 oz., then the 2412 mah pack would be about 67% of that. This works out to be about 3.5 oz.

That is why Zmans combination gets the job done at such a light weight. Considering the difference between the higher internal resistance of the NiMh battery, compared to that of the lipo, I would bet that the 7.2V/2100 pack will also deliver more flying time then one would get from a 4.8V/3600mah NiMh...and it would be a full 6oz. lighter.

I would bet it would also handle a lot more current, before dropping any voltage, compared to the NiMh.

So as you can see it is not just the Mah rating that one should take into consideration.

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12-31-2009 08:35 PM  7 years agoPost 11
crash n' burn99

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ottawa, canada

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Thats good logic.

Do proctologists chew there finger nails when there nervouse?

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12-31-2009 08:37 PM  7 years agoPost 12
crash n' burn99

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ottawa, canada

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I think I may take that route seeing as how I already have a life 2100. My only concern is will it work at -10c??????????????????

Do proctologists chew there finger nails when there nervouse?

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01-01-2010 12:27 AM  7 years agoPost 13
imnxtc

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BC.Canada

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You're flying at -10C!!! Many gyros recommend to stay above -5C.

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01-01-2010 02:46 AM  7 years agoPost 14
crash n' burn99

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ottawa, canada

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Ive flown at -30c, The nitro's need wd40 to get started.

Do proctologists chew there finger nails when there nervouse?

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01-01-2010 02:56 AM  7 years agoPost 15
MAXHSHV

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,mn usa

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crash the wd 40 trick , i may have to try that.I fly down to zero f , but i usually start them in the warm garage.

Century heli rep. To much power is never enough.

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01-02-2010 01:43 AM  7 years agoPost 16
Rodney

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St.Cloud,Florida

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Sounds to me like you guys just need to move to florida, we never have to fly below 32 deg. Thats very rare at that.

Dx7 With Ion Power Supply. Why use anything else.

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01-02-2010 02:07 AM  7 years agoPost 17
MAXHSHV

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,mn usa

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rodney, so you've never had the pleasure of the kind of power a nitro makes in the cold.50's fly like 90's, 90's are over the top insane.personally i'm spoiled, when the heat of the summer comers all my 50's sit idle and i only fly 90's and electrics for the most part.in the heat a 50 nitro just seams so under powered compared to in the cold. At today's fun fly it never got above -13 ferenheit.man did the 50 nitro's scream almost unboggable in that kind of cold

Century heli rep. To much power is never enough.

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01-02-2010 04:37 PM  7 years agoPost 18
Zman

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Florida

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Out of curiosity I weighed my FBL rad today. This is with the battery combo I mentioned above, Century FBL head, spartan gyro and sk360 for FBL. All up weight is 9.3 pounds so going FBL does shed several ounces. If this was the carbon version, I would probably be in the mid to high 8# range. Just FYI in case anyone is interested.

z

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01-02-2010 04:50 PM  7 years agoPost 19
James Kovach

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canton, oh - US

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I assume that is without fuel?

*disclaimer: These are my opinions. Agree or disagree, Your Call :)
Let'r Rip Tator Chip

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01-02-2010 05:05 PM  7 years agoPost 20
rbort

rrProfessor

Franklin, MA - USA

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Weight

That radikal weights in at 9 lbs 4.1oz without blades, canopy or genrator using two fairly light batteries, 3.6oz and 4.1oz. I also accounted for 3oz lighter (9lbs 4.1oz instead of 7.1oz) as the zimmerman side mount muffler is 11oz versus 8oz on the century.

So you're saying yours is 9 lbs 4.8oz. I assume you don't have a gv-1 and the gyro is lower weight (spartan versus 601). But how heavy is that flybar anyways, and doesn't the metal head add weight compared to the plastic version? I know the metal tempest head is heavier than my 3D head between my Spectra and 1005 gassers.

Seems plausible that if the blades are 10.3oz and the canopy is 6.8oz from my gallery photos, then the flybar/paddles must be over a pound to put you at 9 lbs 4.8oz total? I know each paddle is about 1oz as I weighted them during assembly, but never weighted the flybar.

Just wondering and are you using a bathroom scale or a post office scale?

Hey out of curiosity how much did it used to weight before you changed over like in that 3rd picture of your gallery?

-=>Raja.

MA 1005 Hanson 280, 4129 flts
Spectra 27 3DMax, 3187 flts
Whiplash V1 Hanson 300, 1425 flts
Whiplash V2 Hanson 300, 185 flts

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