HobbyKing.com New Products Flash Sale
Reply
Thread Tools
Old Oct 13, 2003, 12:03 PM
Registered User
Arthur Knowles's Avatar
Fallbrook, CA
Joined Oct 1998
1,113 Posts
Razor 300 or 2500 for F-104 by Steve Neil

Hi all,

I have Steve Neil's F-104 and a Wemotec Microfan. I also have 6 E-Tech 1200 Lipos (unsoldered at present). I would like this model to perform well. I do not want it to fly like a parkflier (i.e., slow). It's a jet, I want it to fly like a jet.

I have a RZ300 motor. While discussing the possibilities with Troy at BPP, he thought a 3S LiPo pack may be too harse for the motor. He suggest keeoing the amps at 10 or less with bursts up to 12. Instead of using the RZ300 motor, he suggested the RZ2500 motor.

I have not used either motor with the Wemotec microfan, so I thought I'd ask for some hands on experince or advice with these motors and configurations. So, what do you think?

Art
Arthur Knowles is offline Find More Posts by Arthur Knowles
Reply With Quote
Sign up now
to remove ads between posts
Old Oct 13, 2003, 02:55 PM
Live to ride... and fly!
Tres Wright's Avatar
Forney, TX
Joined Mar 2002
15,165 Posts
I think Dave is running an RZ-300 in his Mynx and is pulling around 14 amps at WOT, so you would definitely by pushing a 3s1p 1200 too hard. The RZ-400 might work though. I'm working (slooooowly) on a Bob-E-Cat that is getting an RZ-350/ Wemo and running on li-po's, it's looking like it will be right at 10 amps.

The 1200's are getting pushed pretty hard at 10 amps, I was running them on my 010/Wemo at 7 amps and they were getting HOT. I'm now running 3s2p 340's.
Tres Wright is offline Find More Posts by Tres Wright
Reply With Quote
Old Oct 13, 2003, 04:42 PM
Registered User
Arthur Knowles's Avatar
Fallbrook, CA
Joined Oct 1998
1,113 Posts
Tres,

I'm not worried about the batteries. I can add parallel packs if needed, or buy a new one. I'm concerned with the motor and performance.

Troy stated that pulling more than 12 amps on the RZ300 is a good way to melt the motor. I don't want to do that, but I want good jet like performance on the F-104. What I don't want is mushy performance like most of the stock foam jets I've seen. They fly, but just barely.

I want a fast and fully aerobatic F-104. Even the RZ400 isn't capable of high amp flow (above 10~12). I'm looking to push about 20 amps (peak) through it and want the motor to last. Troy states the RZ2500 is good for 15~18 amps constant and about 20+ peak. The RZ2500 looks like it is the same diameter as the other Razor motors, just longer.

I just wondered if anyone else had any hands on information with the motors or suggestions. As I haven't used the RZ300 yet, I can trade it back in with BPP toward a new RZ2500. I just want to make the right choice.

Art
Arthur Knowles is offline Find More Posts by Arthur Knowles
Reply With Quote
Old Oct 13, 2003, 04:57 PM
Live to ride... and fly!
Tres Wright's Avatar
Forney, TX
Joined Mar 2002
15,165 Posts
Definely forget the 300 if you're wanting to push 20 amps through it. Bill at PFM tested a small-sized Razor to failure, it threw a mag at around 14 amps constant. The 2500 -might- be able to handle it, but no one has pushed one that hard that I'm aware of. You'd probably be better off going with the tried-and-true Hacker options for that kind of power.

==The RZ2500 looks like it is the same diameter as the other Razor motors, just longer.==

Correct.
Tres Wright is offline Find More Posts by Tres Wright
Reply With Quote
Old Oct 13, 2003, 05:23 PM
Registered User
dave morris's Avatar
orlando fl
Joined Oct 2000
5,701 Posts
I would also recommend going for at least the 2500 over the 300, the 300 is a good motor combo for the micro fan, but not a the power levels you want to run. It is good for around 100-120 watts, and that is with a fair amount of TM. Steve is in the 200+ range. The 350 is ok, but again your looking at somewhere in the range of 80-100 watts on 3s packs. The ranges I am giving has to do with the diff types of Lipo cells used.
dave morris is offline Find More Posts by dave morris
Reply With Quote
Old Oct 13, 2003, 05:38 PM
Registered User
dave morris's Avatar
orlando fl
Joined Oct 2000
5,701 Posts
opps I forgot the KV is lower on the 2500 vs the 300, Not sure what to add at this point, as I have never actually run the 2500, only the 300. I think your best bet would be to just copy what steve did, the hacker b2012L and the 4s3p 340 packs. The only issue he seemed to have is a way to come down on the power a little. The only down side to Lipos is the big jumps in pack voltages which make fine tuning the setup a little harder.
dave morris is offline Find More Posts by dave morris
Reply With Quote
Old Oct 13, 2003, 06:38 PM
Registered User
Arthur Knowles's Avatar
Fallbrook, CA
Joined Oct 1998
1,113 Posts
Thnaks for the input guys. I think I'll give the 2500 a try first. If I need more power, I can always buy a hacker.
Arthur Knowles is offline Find More Posts by Arthur Knowles
Reply With Quote
Old Oct 15, 2003, 12:17 AM
jk
Registered User
jk's Avatar
Huntington Beach, CA
Joined Apr 2001
1,281 Posts
i have alot of Razors (3- 2500a's, 2-MicroHeli V2's, 1-Microheli V1, and 3-RZ-300's). i have tried the MHv1 and the RZ-300 in an Alpha fan (60mm) and the RZ-300 seems to work well. 100+ watts at 8.6A. with almost 8 oz. of thrust (7.93 oz. to be exact).

btw, i run all of my Razors on 3 lipos.

I'm using the 2500a's airplanes and i pull 16-17A WOT but fly them at 50-75% throttle most of the time. the little ones seem to be happy at around 7-9 amps continuous and the 2500a's at around 14-15A.

if you're going to try a Razor in a VASA fan, i'd definitely go with the 2500, or a Hacker as stated above.

-john
jk is offline Find More Posts by jk
Reply With Quote
Old Oct 15, 2003, 12:37 AM
Registered User
Joined Oct 2003
2,421 Posts
I'm getting good bench test results with a razor300 and vasa55 fan with use of a 6 cell ni/mh pack(around 8amp draw).Maybe the 2500 with vasa could pull good on a lower cell count batt pack and save some weight and still get good performance.Seems like the vasa fan pulls more amps and therefor produces more thrust than the other smallish fans of its size.Sorry-just thinking out loud .Matt.
Matthew Cotten is offline Find More Posts by Matthew Cotten
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
WTT Razor 400 or 2500 for PJS550E tabbytabb Aircraft - Electric - Airplanes (FS/W) 1 Nov 14, 2003 11:35 PM
Razor 300/350/400 for Slow stick? fprintf Parkflyers 16 May 06, 2003 10:02 PM
Razor 300 or Razor 400 for IFO and others? Mighty Dingus Power Systems 8 Apr 16, 2003 12:18 PM
Razor 300 or Mini AC 1215/16, help roguewolf Power Systems 11 Apr 06, 2003 09:15 PM
Where's the Fan Trainer by Steve Neil? rcdude Electric Ducted Fan Jet Talk 11 Jun 06, 2001 02:42 AM