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| Electric Jets Discuss electric jets in Canada. |
Topic Review (Newest First)
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| 11-12-2013 11:33 AM | ||
| Eric S. |
Re: 90mm 14 blade-Where will it end? Eric. Once again, thanks for being our "test pilot". I have enough on the go for this winter already so I'll wait to hear your findings & will pick one up in the spring if they are any good. |
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| 11-11-2013 07:34 PM | ||
| Leadfoot |
Re: 90mm 14 blade-Where will it end? I was looking at that same fan/motor combo that X-flight was offering! I look forward to hearing how it performs in your "test facility". Steve |
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| 11-11-2013 05:34 PM | ||
| 4stripes |
Re: 90mm 14 blade-Where will it end? Had a look at the X-flight site and noticed they are selling the XRP 90mm 14 blade fan with 1450kv motor dynamically balanced for $69! Ordered one to see if they are any good for our next 6S powered jet. Will report any findings, good or bad. http://www.x-flight.com.hk/index.php...1=&dis=&id=220 |
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| 11-11-2013 10:39 AM | ||
| airbourne |
Re: 90mm 14 blade-Where will it end? Quote:
A lot of these fans CS, Freewing, Lander etc are clones of each other. I recently needed to purchase a new Lander 10 blade rotor and noticed it is an exact match to the CS10. I also have a Lander 10S 1000kv unit that uses a CS12 blade rotor, so it's no surprise they perform on par. |
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| 11-10-2013 09:52 PM | ||
| 4stripes |
Re: 90mm 14 blade-Where will it end? Although the majority of my fans are CS brand, there are now plenty of other low cost options due to their popularity. Taft, Freewing, XRP, Lander, EPF to name a few. Even the older Haoye fans can be made to sound good with proper balancing. Hopefully more of these will come pre-dynamically balanced from the manufacturer in the future so everyone can enjoy the experience with minimal fuss. |
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| 11-10-2013 09:38 PM | ||
| 4stripes |
Re: 90mm 14 blade-Where will it end? "Take your average foam 90mm jet, say an F16 at 6.5lbs -- to get decent performance (100-110mph with good vertical) will require roughly 3200watts on the Changesun 12 fan flying on 8S fandrive 1400kv, that's going to load up 115amps+" Really, 3200watts for a plane weighing 6.5lbs... A typical 90mm foam jet loaded with retracts, flaps and some bling in the cockpit weighs about 3.2kg (mine do anyway). They fly very well on 1800watts. My heavier planes in the 4.2kg range fly very well on about 2300watts. All with CS fans. Many started life with 6 blade fans (wemo midifan clones) and flew equally well on the same power, although different motors for obvious reasons. Having flown both the classic noisy fans and the quieter high blade count fans, I will never go back. The sound of the plane is part of the experience and if it costs even 10% loss of efficiency it is worth it IMHO. Cheers |
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| 11-10-2013 08:22 PM | ||
| Eric S. |
Re: 90mm 14 blade-Where will it end? Jeff. 4stripes knows plenty about fans. He's probably done more tests & posted more info on the CS12 units here on RC Canada than anyone else. I'm pretty sure what he was wondering (as am I) is what motor/battery/plane combo YOU used with the 14 blade XRP unit to come up with your conclusion above or if you are just generalizing about all the cheaper multi blade fans that have come out over the last couple of years. My Fly-Fly mirage/CS 12 performs great with a 1600kv on 6s, right up there with my $150. Lander. Exactly what $100 fans are you using in your composites? |
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| 11-10-2013 06:16 PM | ||
| airbourne |
Re: 90mm 14 blade-Where will it end? I'm not a scale flyer, so my requirements and what works for me, may not work for you. It all depends on what kind of models you fly and what kind of performance you want. Take your average foam 90mm jet, say an F16 at 6.5lbs -- to get decent performance (100-110mph with good vertical) will require roughly 3200watts on the Changesun 12 fan flying on 8S fandrive 1400kv, that's going to load up 115amps+ On a 6S setup with something like a Tacon 1700kv motor, will draw more amps. With 4500mah packs, that only leaves you with a safe 2.5mins of flying time, of course you will need lipo's that can take that kind of load. Stepping up to a composite plane with even more performance, you also become limited by intake area/exhaust size that the CS fans demand. That's why the vast majority of pilots use other fans in these applications. With 70mm models you can still get away with using the CS10/12 blade as long as you're running a 6S setup (I normally use high power units with 1400watts+). As long as your airframe can accept a 6S 3300-4000mah pack, you will get decent flight times. So I would say it's a great fan in certain applications, but don't expect to pay $30bucks and have it perform on par with a $100 unit. If you're interested there is a ton of information already out there on the subject. |
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| 11-10-2013 10:35 AM | ||
| 4stripes |
Re: 90mm 14 blade-Where will it end? Quote:
There seems to be a perception that a multi blade fan is much less efficient than lets say a 5 or six blade setup. I haven't found much difference in efficiency when I changed from a fleet of 6 blade 90mm Wemo midi fan style fans to the Changesun 12 blade fans. Please note the proper motor had to be matched to the new fans due to their higher pitch design. I recently switched an Eflite 70mm Habu fan with a 10 blade CS fan without changing the motor. Sound was dramatically improved and thrust increased. Yes the amp draw also increased so the ESC had to be upgraded and extra cooling fins added to the motor for insurance. |
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| 11-10-2013 08:20 AM | ||
| Eric S. |
Re: 90mm 14 blade-Where will it end? Have any video? Do they sound any different than the 12 blade units? |
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