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Old Oct 11, 2009, 04:32 AM
sj.
Registered User
Cornwall, UK
Joined Apr 2007
51 Posts
Quote:
Originally Posted by Dizz
Had my first go at some Doppler analysis this evening. I recorded 17 speed runs in one flight today, 8 have proved usable (I need to hold the line longer after passing the mic). It has averaged out at a straight and level speed of 85.5mph +/- 2mph. Am using Tornado 4S 2500mAh 4S packs and they are only getting luke warm. From how much it took to recharge I estimate that it can only be drawing about 27Amps flat out in the air.

Pete
Dizz

I'm guessing you too got yours from Totem and you're on the new LP fan rotor. I'd guess that I'm getting the same as you. Have you noticed a significant drop off from the origional fan?

sj
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Old Oct 11, 2009, 05:21 AM
Hangar queen hoarder
tailslide5_0's Avatar
Denver, CO
Joined Jul 2006
3,939 Posts
Quote:
Originally Posted by gundamnitpete
i couldn't find it on thier site, do you have a link?
Well they had it the other day, they must have stopped carrying it. Sorry
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Old Oct 11, 2009, 02:48 PM
Asks too many questions
natterjak's Avatar
Berkshire, UK
Joined Nov 2005
474 Posts
Guys, your opinion please on the HET 3W-15 motor with HET 6904 fan in a Squall! with 4S 2500mAh 20C lipos? How would this compare to the HET 3W motor?

I'm wondering what current a 3W-15 with 6904 would produce and whether it will be pushing the lipos too hard?
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Old Oct 11, 2009, 04:07 PM
another MONSTER ?
One Six Right's Avatar
Valencia, CA
Joined Jan 2008
3,733 Posts
I'm stickin' with the original plan.
ARC 28-58-1
6s
DS-30
Just haven't gotten to building it yet. If I rush it, It won't be as fast.
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Old Oct 11, 2009, 04:17 PM
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Dizz's Avatar
Brixham, Devon, England
Joined Jun 2004
297 Posts
Quote:
Originally Posted by sj.
Dizz

I'm guessing you too got yours from Totem and you're on the new LP fan rotor. I'd guess that I'm getting the same as you. Have you noticed a significant drop off from the origional fan?

sj
I did indeed sj, but its the replacement 3 blade reduced diameter HP one. I'm a bit disappointed with the performance now, definitely not as much thrust in the air as the few flights I had on the old impeller. Only just >1 T:W now leaving little in hand to help get out of trouble, as I found out on the second flight yesterday doing some high alfa stuff: glad I was at 3 mistakes high because it took 2 1/2 to mush out of the twisty-turny-tumbling thing I got into I didnt manage any flying today, but the Squall is in the car just in case I get the chance on the way home after work this week.
Pete
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Old Oct 11, 2009, 05:53 PM
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Xpress..'s Avatar
United States, CA, Alpine
Joined Oct 2007
21,001 Posts
Okay, I wanna add some lead to mine, and go 6S

Same setup as One Six Right..
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Old Oct 11, 2009, 08:17 PM
Team White Llama!
gundamnitpete's Avatar
Joined Jan 2008
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Quote:
Originally Posted by Xpress..
Okay, I wanna add some lead to mine, and go 6S

Same setup as One Six Right..

ARC 28-58-1= $90

Suppo 200 amp= $67

6S 30C 3200's= 115

Het 6904 (brake it in soft)=$35

i love my 28-58-1
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Old Oct 11, 2009, 08:21 PM
Team White Llama!
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Joined Jan 2008
8,144 Posts
Quote:
Originally Posted by natterjak
Guys, your opinion please on the HET 3W-15 motor with HET 6904 fan in a Squall! with 4S 2500mAh 20C lipos? How would this compare to the HET 3W motor?

I'm wondering what current a 3W-15 with 6904 would produce and whether it will be pushing the lipos too hard?

all i can find is the 2W-15, which is the "2W". it's a 3S motor, i doubt it would survive on 4S, and if it did it would pull around 100 amps.

If you want to go RIGHT to the limit of your current lipos, a 2W-20 would work, but it would pull the max C rating from your packs, so if you held it full throttle the whole flight they'd come down HOT.

a 3W would be a little better, lower amps draw and power, but easier on your batteries.
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Old Oct 11, 2009, 08:43 PM
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Shadrack's Avatar
Winnipeg
Joined Feb 2002
5,960 Posts
Does anyone have any real numbers on thrust and watts on the replacement fan vs the old one?
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Old Oct 11, 2009, 09:20 PM
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Denver, CO
Joined Jul 2006
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Quote:
Originally Posted by natterjak
Guys, your opinion please on the HET 3W-15 motor with HET 6904 fan in a Squall! with 4S 2500mAh 20C lipos? How would this compare to the HET 3W motor?

I'm wondering what current a 3W-15 with 6904 would produce and whether it will be pushing the lipos too hard?
The HET 3w-15 is the same thing as a 3w, they're better known as just the 3w.
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Old Oct 11, 2009, 10:40 PM
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Xpress..'s Avatar
United States, CA, Alpine
Joined Oct 2007
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Quote:
Originally Posted by gundamnitpete
ARC 28-58-1= $90

Suppo 200 amp= $67

6S 30C 3200's= 115

Het 6904 (brake it in soft)=$35

i love my 28-58-1
Would i need to use a thrust tube, or would stock work?

I need a ballistic missile.. with wings..
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Old Oct 11, 2009, 10:55 PM
Team White Llama!
gundamnitpete's Avatar
Joined Jan 2008
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Quote:
Originally Posted by Xpress..
Would i need to use a thrust tube, or would stock work?

I need a ballistic missile.. with wings..
stock would work, but a thrust tube will always increase performance (and taylor it to what you want).


the 28-58-1 is some serious power, if your serious about a high power setup, i suggest an ARC 28-47-1 and 6904 fan. THis will be about 1200-1300 watts on 4S. roughly 90 amps depending on timing

The 28-47-1 is $60

suppo 100amp=$40

XPS 4S 3200 30C= $80, or you could run two 4S 2200 30C's in parallel for a 4S 4400 30C, which could handle the power.

your looking at 130 mph, maybe more if you use a thrust tube down to 80%
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Old Oct 11, 2009, 10:56 PM
another MONSTER ?
One Six Right's Avatar
Valencia, CA
Joined Jan 2008
3,733 Posts
Quote:
Originally Posted by Xpress..
Would i need to use a thrust tube, or would stock work?

I need a ballistic missile.. with wings..
Make your own thrust tube. 70-75% FSA. That'll make it ballistic. Test your amp draw before you fly it. It won't have as much thrust for the launch.
http://www.pulserate.com/
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Old Oct 12, 2009, 12:41 AM
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Xpress..'s Avatar
United States, CA, Alpine
Joined Oct 2007
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^Yeah, the launch is one thing I had worries about. Looks like I'd need to use a bungee launch, but just how i'm supposed to mount a hook to the plane without ripping the foam out...
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Old Oct 12, 2009, 12:54 AM
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Canton, Michigan USA
Joined Jul 2007
16,650 Posts
Quote:
Originally Posted by Xpress..
^Yeah, the launch is one thing I had worries about. Looks like I'd need to use a bungee launch, but just how i'm supposed to mount a hook to the plane without ripping the foam out...
Use 1" square piece of plywood with Z bend piece of 1/8" wire piece embedded into the block with epoxy. Fit the component into a whole you cut into the foam if you want to make it look like it belongs there.
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Last edited by Prof100; Oct 12, 2009 at 01:08 AM.
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