8-10 just isn't enough!

8-10 just isn't enough!
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8-10 just isn't enough! - 9/23/2007 7:21:08 AM

stump3r

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Joined: 10/21/2006
From: Calgary, AB, CANADA
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Need the collective yet again! Guys what bats can a guy move to to get extended flying time. I average 8 to10 minutes of flight time per bat. Is there anything that will keep a guy going longer? I'm pretty sure the next mod coming up will be the move to the xtreme motors which will probably get me a couple of minutes. What is everyone doing?

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Post #: 1

RE: 8-10 just isn't enough! - 9/23/2007 7:51:01 AM

mrasmm

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make sure to lube everything up real well with teflon. That really makes a difference. I used to lube metal on metal with oil, but i've found that everything spins much more free and with alot less resistance from the teflon lube. I personally use dry ice, and it can be found on the product reviews here, but there are alot of teflon lubes that would work well. Make sure the mesh between both motors and gears is a little loose, but not too loose. If it's tight that will cut into your flight time. Also if your packs are getting up over 100 cycles on them you could probably get more air time with a new pack. Motors run more efficient when they are cooler, heat provides resistance, so if you don't have a heat sink installed, that may also help. Alot of people have said that the stiffer blades also help with flight time because not so much energy from the motors go into deflection of the rotors. Of course weight is going to be a big factor, even a few grams that you can get rid of will really help with flight time, and also the size of the batteries. I think most people are finding the best times on 1000mAh to 1200mAh packs on these heli's =)

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RE: 8-10 just isn't enough! - 9/23/2007 1:16:17 PM

shufflez

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Check these messages, you'll find some calculations (both in same thread):
Weights: http://www.rcuniverse.com/forum/fb.asp?m=6378441
Amps/current: http://www.rcuniverse.com/forum/fb.asp?m=6384313

Look for the best power2weight ratio

.

As Mrasmm (and others) have stated already, the max. Amperage per ESC considered safe is around 4A (although they are rated higher, but then heat becomes a major issue). With around 8A in total you should be fine. And i get around 20/25min of flighttime (excluding the cooldown periode in between) on my 1100mAh LiPo.

And Mrasmm, i'm now using WD40, which works fine, but it 'collects' quite a lot of dust and other stuff.
Is the teflon stuff less prone to have that problem? I've tried the 'doorlock lube' stuff, with graphite, which works but seems to wear off quite fast causing friction (probably due to the graphite) ?

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Post #: 3

RE: 8-10 just isn't enough! - 9/23/2007 5:09:54 PM

BryFlyGuy67

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I would like to hear the brand names of the Teflon lube. Teflon lube and other "dry" lubes are perfect for a Heli, since they go on wet and then dry. I have not worked with Teflon lube, but I have used many graphite-based ry lubes in other applications to good effect.

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Post #: 4

RE: 8-10 just isn't enough! - 9/23/2007 6:19:23 PM

stump3r

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From: Calgary, AB, CANADA
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Great idea with the teflon lube. I think I saw some at my LHS yesterday. I'll have to go check next week and report back. Shufflez is there a certain brand of battery you use? How about the full spec. I have to get a couple of those packs.
As far as cooling goes I have the heat sinks on, vented canopy etc. the only thing i haven't vented is the 4in1. Guess I could get rid of more weight as well.

_____________________________

Life is tough. Its even tougher when your stupid! - John Wayne
CX2, Gaui 200SD, HBKII FP, CX450SEV2, DX7

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Post #: 5

RE: 8-10 just isn't enough! - 9/23/2007 10:55:41 PM

mrasmm

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From: Sometown, Northern Utah, USA
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quote:

ORIGINAL: shufflez

And Mrasmm, i'm now using WD40, which works fine, but it 'collects' quite a lot of dust and other stuff.
Is the teflon stuff less prone to have that problem? I've tried the 'doorlock lube' stuff, with graphite, which works but seems to wear off quite fast causing friction (probably due to the graphite) ?

yeah, the teflon stuff definately is alot better. It is dry and more like a film rather than a powder so it doesn't come off all that easy. Read this review for more info

quote:

ORIGINAL: BryFlyGuy67

I would like to hear the brand names of the Teflon lube. Teflon lube and other "dry" lubes are perfect for a Heli, since they go on wet and then dry. I have not worked with Teflon lube, but I have used many graphite-based ry lubes in other applications to good effect.

The brand I am using is dry ice and it works great. It doesn't really matter what you get as long as it goes on wet and then dries and doesn't have a pretolium based propellant, so basically you have to dap or squirt it on rather than spray it on like wd40 or something.

dry ice review
http://www.rcuniverse.com/magazine/article_display.cfm?article_id=784

quote:

ORIGINAL: stump3r

As far as cooling goes I have the heat sinks on, vented canopy etc. the only thing i haven't vented is the 4in1. Guess I could get rid of more weight as well.

If you think you'll be cont drawing 4A or more then you'll just need to heatsink the FET's (parts marked 7313, if I remember right the parts are 8 pin dips), an dthey can handle up to 6A each cont when they have a heatsink on them.

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Post #: 6

RE: 8-10 just isn't enough! - 9/24/2007 9:56:58 PM

shufflez

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From: Amsterdam, NETHERLANDS
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quote:

Shufflez is there a certain brand of battery you use? How about the full spec. I have to get a couple of those packs.

In my post about the weights of batteries, i've linked to the 2 brands which i have now (along with one unbranded and the stock, total of 6). My DN-Power are the stock-size and fly just fine (from KRs Hobbies/XtremeCX2). The 1100mAh 25C one is from: http://www.lrp.cc/e/lis/06_Batteries/VTEC%20LiPo/Batteries_LiPoFeatures.html. It's the 79110 one, it's awesome, but be sure to let it sit and cool around half way in flighttime (after about 10-12 minutes).

quote:

If you think you'll be cont drawing 4A or more then you'll just need to heatsink the FET's (parts marked 7313, if I remember right the parts are 8 pin dips), an dthey can handle up to 6A each cont when they have a heatsink on them.

I'm still looking for ways to expand my 4in1 with (videocardmemory) heatsinks, as i DONT want to fry one and be unable to fly for several weeks. I'll report on the progress on the (almost finished!) CX2 site!
Along with pics of course.

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Be like a CX2 blade; flexible as wax, sharp as a razorblade.

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Post #: 7

RE: 8-10 just isn't enough! - 9/25/2007 12:24:34 AM

stump3r

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From: Calgary, AB, CANADA
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Thanks Shufflez appreciate the info! Have 2 of the DN's on there way

As for the monster pack I'm going to wait and see what I get for performance once the new motors are in

If you need any help with the site drop me a line and I will help out in any way I can!

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Life is tough. Its even tougher when your stupid! - John Wayne
CX2, Gaui 200SD, HBKII FP, CX450SEV2, DX7

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Post #: 8

RE: 8-10 just isn't enough! - 9/26/2007 12:30:25 AM

mrasmm

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From: Sometown, Northern Utah, USA
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quote:

ORIGINAL: shufflez

I'm still looking for ways to expand my 4in1 with (videocardmemory) heatsinks, as i DONT want to fry one and be unable to fly for several weeks. I'll report on the progress on the (almost finished!) CX2 site!
Along with pics of course.

you can also replace the FET's with larger n channel fets, like the cp pro uses 7413's. You could double stack the 7413's and without a heatsink you should be able to push 10A cont =) It would only be about a $4 to $6 buck mod + whatever shipping costs.

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Post #: 9

RE: 8-10 just isn't enough! - 9/26/2007 4:55:51 AM

BladeCX2Two

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From: Upper Midwest, WI, USA
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Shufflez- Hello. I want to try one of those LRP 7.4 1100 maH lipos. Where did you get yours from? I live in the U.S. and I can't find anyone around here that carries them. I can't see where you can buy them directly from LRP either.

Here is one that has similar specs. Has 100 more maH than the one you have. Doesn't look like it comes with a connector for the power wires. Not sure if it would work or not.

http://cgi.ebay.com/NEW-FlightPower-LiPo-7-4V-1200mAh-25C-EVO25-2S-Balance_W0QQitemZ290158593833QQihZ019QQcategoryZ34056QQrdZ1QQssPageNameZWD1VQQcmdZViewItem

Thanks.

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Post #: 10

RE: 8-10 just isn't enough! - 9/26/2007 4:57:17 AM

mrasmm

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I think flight power uses the TP balance end, so you'd have to get a TP charger or a TP to jst adaptor cable

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RE: 8-10 just isn't enough! - 9/26/2007 5:25:12 AM

BladeCX2Two

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From: Upper Midwest, WI, USA
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hello mrasmm-

I don't quite follow...sorry. Do you mean the cable that we normally put into our e-flite charger is actually the one that they use for the power leads?? If so, looking at that picture in the link I provided, what would black & red wire be for (the ones that don't look like they have a connector).

It would be sweet if I could get those batteries to work as Illinois is not far from me at all. I could have them in a few days being that I'm in Wisconsin.

Thanks.

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Post #: 12

RE: 8-10 just isn't enough! - 9/26/2007 6:35:18 AM

mrasmm

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From: Sometown, Northern Utah, USA
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oh, sorry, I guess I confused you

The balance adaptor is TP, so they wont plug in to your stock charger, the balance lead on the TP's are smaller 2.0mm spacing instead of 2.5mm. Anyways if your LHS carries stuff from csrc as them for an adaptor that will go from your charger to the battery. Should run you about $3 bucks or so. =)

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Post #: 13

RE: 8-10 just isn't enough! - 9/26/2007 6:48:29 AM

BladeCX2Two

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From: Upper Midwest, WI, USA
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Hey, that is great information. Thanks for giving me some leads on this. I will check more tomorrow after work. Gotta head to bed now.

Thanks again.

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Post #: 14

RE: 8-10 just isn't enough! - 9/26/2007 6:53:58 AM

BladeCX2Two