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Old Feb 02, 2013, 01:33 AM
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the new 64mm 10-blade units, e.g., from HK; should make fitting the fan a lot easier (less foam to remove) - has anyone tried it yet?

http://www.hobbyking.com/hobbyking/s...ey_3300Kv.html
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Old Feb 02, 2013, 02:35 AM
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Same as Disho's set up

I am new to this forum and new to EDFs
I have just finished my T45 with the same set up as Disho's. I wish this East Yorkshire wind would calm down though at 25 mph so I can get a flight in.
Cheers for all the advice Disho re the power set up.
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Old Feb 02, 2013, 06:34 AM
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Quote:
Originally Posted by Frank2351 View Post
I am new to this forum and new to EDFs
I have just finished my T45 with the same set up as Disho's. I wish this East Yorkshire wind would calm down though at 25 mph so I can get a flight in.
Cheers for all the advice Disho re the power set up.
Wellcome to the forum frank, try and get some video of the flight , hope you added a cheater hole as i found mine is better with one
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Old Feb 02, 2013, 09:22 AM
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Cheers Disho
Did the cheater hole give more thrust for hand launching.

I bought 2 BL32s and I was thinking about putting this same set up in PZ habu or a dynam m. What's your views?

Is there any other cheap Air frame this setup will work well in using the 70mm CS 10.
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Old Feb 02, 2013, 10:54 AM
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Quote:
Originally Posted by Frank2351 View Post
Cheers Disho
Did the cheater hole give more thrust for hand launching.

I bought 2 BL32s and I was thinking about putting this same set up in PZ habu or a dynam m. What's your views?

Is there any other cheap Air frame this setup will work well in using the 70mm CS 10.
Yes the cheater hole made a big difference, made it easier to hand launch, and gave me 100 watts more power, yes loads of cheap Air frame this setup will work well in, its down to what type you like
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Old Feb 02, 2013, 11:10 PM
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My T-45 (#3)

Fuselage was sanded to accomodate a 70mm fucted fan. Grilled cheater hole on the underside of the wing.

Currently has EDF & motor from an Exceed F/A-18E. Considering swapping those out with a Cyclone motor, CS 10-blade EDF and 100A ESC at some point.
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Old Feb 03, 2013, 02:01 AM
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.....

Recently, i try 4s 1800mah on the stock motor. After a few flights, i fried the motor. Saw a motor by the name "topband AE2815D 01C 3500kv". Its specification states that it run on 11.1v. Can anyone tell me if i run it on 4s (14.8v), will i fried it again.? I am using a 60A ESC. Thanks for reading.
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Old Feb 03, 2013, 02:19 AM
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If the motor is rated for 11.1V, it is likely that it will fry at 14.8V. Why take chances, just use a motor rated for 4S.
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Old Feb 03, 2013, 08:29 AM
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That is not actually true.... listed specs are very often not even accurate. Very often you can use even out to 6S..... BUT it is not about the volts, more about the Amps and Power. So a small motor will still fry because if you used 5S or 6S the AMPS and Power it would try to run at would fry it.

You can get other clues as to whether a motor will run ok at what volts/Amps...

This is your quoted motor:
Specifications:

KV:3500
Dimensions(mm):22*15
shaft : Φ3.0mm
voltage(v):11.1- 14.80
weight:71g
No load current:1.9A
No load RPM:38460
load current(A):17.8A
load RPM:32780
thrust(g):485g

Various things tell the story.....
They claim 17.8A... that will be the max recommended, but it will do more. But not much more. Probably 20Amps or so... especially short term.
4S = 14.8V.... if 20A (we dont know yet what it will use, but sont need to yet) that is 296 Watts.... would the T-45 even fly with that!!!????
I doubt it.... so there is no more need to press on even checking this motor!

But more info is the KV....
3500 x 14.8v = 51,000 RPM./.. x 0.8 for typical losses = 41,440. That is fine for the fan (even 50k probably on the stock fan), bu t it is also too low a number to be of great use. PLUS the motor would never actually achieve that, as it is too weak anyway.

Then the weight... 71g
Too light to be able to handle power... 300W... maybe 400W.... still short of what you really need. Which the first calculations already showed, but this also verifies that irrespective of voltage it would be useless for this application.
I would say you need 500W or more for this T-45(?).

IF that motor was used in some smallish 64mm aircraft application it might be ok. They are commonly seen in 'lack lustre' EDF jets that hardly fly like a real plane/jet! LOL
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Old Feb 03, 2013, 08:31 AM
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HobbyKing has the same motors for MUCH less. (Not that you want that one).
They also have some others that should be more useful to use.

eg These:
http://www.hobbyking.com/hobbyking/s..._for_64mm.html

http://www.hobbyking.com/hobbyking/s..._for_64mm.html

Now that I think about it..... I am pretty sure I have some of those! I have heaps of 64mm fan type motors that I never used, seeing after two 64mm jets I skipped out to all 70mm.
I only got the kit T-45 but I guess it has the fan woth it... if I can work out which that was! So I could check the motor fit etc.
But if you want an even better long term solution, grab an Inrunner instead.

Inrunner below: Out of stock (they may never get them again), but this sort of specs. Don't worry, it will do 4S totally fine. And it is a motor that CAN and WILL do the job asked of it, fully (not straining) and long term too.
There are lots of places selling that sort of thing. You are looking for 2845 or 2850 size. And it will get your T-45 flying fast like a JET! hehe
http://www.hobbyking.com/hobbyking/s..._Inrunner.html
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Old Feb 03, 2013, 08:37 AM
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....

Quote:
Originally Posted by PeterVRC View Post
That is not actually true.... listed specs are very often not even accurate. Very often you can use even out to 6S..... BUT it is not about the volts, more about the Amps and Power. So a small motor will still fry because if you used 5S or 6S the AMPS and Power it would try to run at would fry it.

You can get other clues as to whether a motor will run ok at what volts/Amps...

This is your quoted motor:
Specifications:

KV:3500
Dimensions(mm):22*15
shaft : Φ3.0mm
voltage(v):11.1- 14.80
weight:71g
No load current:1.9A
No load RPM:38460
load current(A):17.8A
load RPM:32780
thrust(g):485g

Various things tell the story.....
They claim 17.8A... that will be the max recommended, but it will do more. But not much more. Probably 20Amps or so... especially short term.
4S = 14.8V.... if 20A (we dont know yet what it will use, but sont need to yet) that is 296 Watts.... would the T-45 even fly with that!!!????
I doubt it.... so there is no more need to press on even checking this motor!

But more info is the KV....
3500 x 14.8v = 51,000 RPM./.. x 0.8 for typical losses = 41,440. That is fine for the fan (even 50k probably on the stock fan), bu t it is also too low a number to be of great use. PLUS the motor would never actually achieve that, as it is too weak anyway.

Then the weight... 71g
Too light to be able to handle power... 300W... maybe 400W.... still short of what you really need. Which the first calculations already showed, but this also verifies that irrespective of voltage it would be useless for this application.
I would say you need 500W or more for this T-45(?).

IF that motor was used in some smallish 64mm aircraft application it might be ok. They are commonly seen in 'lack lustre' EDF jets that hardly fly like a real plane/jet! LOL
Thanks so much. Great informations!
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Old Feb 03, 2013, 01:55 PM
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Here are the specs for the stock motor:

Motor: 2830-1000
KV or RPM/V: 4800 KV
Watts : 700W
Cells Max: 4s
Shaft Size: 3mm
Dimensions: 28mm x 30mm
Weight: 58g

Don't know if they've since changed the motor for a lower-rated one - it's been over 2 years since I bought the PNP version from HK.
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Old Feb 03, 2013, 02:21 PM
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Quote:
Originally Posted by mopetista View Post
the new 64mm 10-blade units, e.g., from HK; should make fitting the fan a lot easier (less foam to remove) - has anyone tried it yet?

http://www.hobbyking.com/hobbyking/s...ey_3300Kv.html
I'm building a T-45 and have this motor on order. Will report how it goes.
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Old Feb 03, 2013, 05:13 PM
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Joined Nov 2006
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Those DPS fans (all of them 5 blade or 10 blade - but 10bl sound a bit better) are very good units!
Plug and Play.... great power and balance, ready to use!

CyclonePower has a range of them too (50mm, 64mm, 70mm, all in 10bl).... they cost a little bit more, but are a bit lighter.
CP have the 12bl 70mm alloy version coming out this week too. 2860-2200kv for 5S or 6S
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Old Feb 04, 2013, 03:32 PM
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Getting ready to start my T-45 build and have a question. I thought the higher kv the more rpms = faster plane. Disho's set-up looks like BL32 2150 kv not high RPM? What am I not getting..BTW Disho's set-up scoots. I understand more volts = more RPM but isnt 6s putting too much load on the motor?
Thanks for the replies.
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