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HET 9305 or Wemotec midi - 10/27/2009 2:43 AM   
jocket


 

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From: Charlottesville, VA, US MINOR OUTLYING ISLA
Status: offline 		I keep reading the same stuff over and over and can't decide, so I've come to those with more experience.
Which EDF is the best: Wemotec Midi or HET 9305 - in preformance, speed and maintenance? Or is there a better one.
I can't spend a lot of money, the old lady has me on a leash.
Also, which motor, ESC and Lipo combination would give me the best bang for my buck?
Please be specific, all the different numbers just confuse me and make my head hurt.
Thanks

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RE: HET 9305 or Wemotec midi - 11/5/2009 3:38 PM   
SoppyJoe


 

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Status: offline 		Id go with the wemo pro. As far as your componets go, a little more info would be helpful. What airframe do you want to put it in, how many cells to you want to run, how many watts do you want to get.



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RE: HET 9305 or Wemotec midi - 11/5/2009 6:05 PM   
JeffH


 

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Status: offline 		Certainly need more information to give you an informed opinion. Right now, I say got with the Neu 1415 1.5y on 10s and CC125HV ESC. That will put out about 10 pounds of thrust on the Midi. You need a minimum of 30c batteries, preferrably higher and they need to be at least 4000mah. But that is not a cheap setup. One of the new ARC motors from lightflightrc.com will get you a little cheaper setup, but the batteries and ESC are still going to cost some bucks!

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RE: HET 9305 or Wemotec midi - 11/5/2009 8:58 PM   
jocket


 

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From: Charlottesville, VA, US MINOR OUTLYING ISLA
Status: offline 		I'm building my own airframe. It weights about 3 lbs stripped. I was comparing motors, here on the Universe, and found the
E-flite Park 370 inrunner-5400Kv. It is listed for high speed and all purpose. I was going to run it on 6 cell. The motor draws 15 amps at 9.6 volts. Don't have an ESC yet.
What's your opinion?

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RE: HET 9305 or Wemotec midi - 11/5/2009 9:09 PM   
jocket


 

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From: Charlottesville, VA, US MINOR OUTLYING ISLA
Status: offline 		JeffH,
Thanks for the advise but that is more expensive then I can go. I'm building my own airframe, its about 3 lbs stripped. I did some research here at the Universe and found the following motor: E-Flite Park 370 inrunner-5400Kv. It calls for 4-8 cells, draws 15 amps at 9.6 volts. Under applications it says good all purpose, high speed, park flyers and small electric.
I don't need 10 lbs of thrust, half that should do the job - I may be wrong. That's why I'm asking for HELP.
Thanks

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RE: HET 9305 or Wemotec midi - 11/5/2009 10:02 PM   
mark_d


 

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Status: offline 		That is a 20mm diameter motor. It would work well on a 55 - 64mm fan but never on a 90mm. If you want to use one of those fans you need a 36mm diameter motor, 50mm long for 900 Watts and under and longer for more power.

The ESC and batteries will be the expensive part. Could you give more infromation about the airframe? What is the intended flight envleope - fast, slow, landing speed, wingloading...

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RE: HET 9305 or Wemotec midi - 11/5/2009 11:04 PM   
JeffH


 

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Status: offline 		As mark d said, that lilttle motor will probably burn up on the first WOT run with a 90mm fan. To even get 5 pounds of thrust, you are going to need a decent motor and 4-5 cell batteries. If you drop back to 70mm, you can easily get 4 pounds, but you will pulling right 100 amps. It seems as if you are very new to the EDF scene. Yes there are many many different combos out there. You really need to spend a couple weeks educating yourself on what does what. 90mm stuff is cheap and not cheap at the same time. You can get big performance from them for relatively little money and run with some of the high powered EDF planes out there. For lower performance stuff they are more expensive than 70mm setups.
If you are at three pounds bare airframe, you will be at 6+ pounds for take off. That sounds like a very hot 70mm setup or a middleof the road 90mm. You are going to spend several hundred dollars on a setup no matter which way you go. The hot 70 will require 100+ amp esc, and batteries that can supply those amps, while the 90mm can provide the the same performance on less amps but more weight to the airframe. The 90mm will also require more intake and exhaust area.

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RE: HET 9305 or Wemotec midi - 11/6/2009 8:18 PM   
jocket


 

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Status: offline 		JeffH,
Thanks for your help. I guess I've got a lot of homework to do. One last thing, I saw an 88mm EDF somewhere, would that be a good middle of the road to go with?
Thanks
Jocket

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RE: HET 9305 or Wemotec midi - 11/6/2009 8:50 PM   
jocket


 

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Status: offline 		mark_d,
I hadn't planned for a lot of speed or fancy flying. I was thinking a flying speed of about 25-35 MPH, I don't know what the landing speed would be - but lets figure 5-10MPH and I haven't figured the wing loading. I can tell you that each wing is 24 inches wide with a root of 16 inches and a tip root of 5 inches. I've got 3 tubes for the body build: they are 3, 3.5 and 4 inches diameter-I'll choose
the tube when I know which EDF I'll use it looks like I'll be using the 4 inch tube.
What ever I do, I've got some homework to do. I just wish all the motor makers used the same ID system on there motors. You know, something that showed the motor dia, watts and amps - it would make selecting a motor so much easier.

Thanks for the help.
Jocket

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RE: HET 9305 or Wemotec midi - 11/16/2010 1:29 AM   
alanjets


 

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Status: offline 		has anyone had problems with the het fans i have put togeather 2 fans now and both have ran ok at half throttle and at 3/4 throttle they distroy themselves.The setup im running is a het 700-66-1680 with a het 9305 700 fan 120a speed controler with 8 cells. the fans go togeather ok and are free running and dont touch the sides but at 3/4 throttle end up touching the sides and blades just shread anyone got any idears

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RE: HET 9305 or Wemotec midi - 11/16/2010 4:23 AM   
ACES&8s



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Status: offline 		do you notice vibration problems in mid to low throttle?

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RE: HET 9305 or Wemotec midi - 11/17/2010 4:44 PM   
alanjets


 

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Status: offline 		nope no vibration at all run great till 3/4 then touches

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RE: HET 9305 or Wemotec midi - 11/17/2010 6:13 PM   
JeffH


 

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Status: offline 		Friend of mine runs his 9305 on an ARC 36-65 with a 6s setup. VERY VERY smooth from off to WOT. Of course you are probably turning more RPM with an 8s setup.

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RE: HET 9305 or Wemotec midi - 11/18/2010 12:57 AM   
Extreme_RC



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Status: offline 		The HET fans require very careful assembly and adjustment, can take up to an hour to get one running dead smooth, sometimes only 10 mins, its luck of the draw due to the collet design. You need to tighten the collet down first so its a press fit to the motor shaft, test run with low speed throttle zaps to make sure its running true, then fit the rotor and test slowly, if you feel vibration as you raise the throttle, then you will need to loosen and remove the rotor, rotate it a little and test again, this could take 30-40 attempts to get the moving parts lined up and in harmonic balance.

The only way it is exploding at 3/4 is because you have it badly assembled and its vibrating it nuts off! The Midifan is so much easier for the average user to work with, I assemble these fans every week for customers and the Midi can be put together and 99% of the time it runs smooth the first time its assembled. Wemotec has been taking our feedback and working hard on tolerances, the parts fit and finish is superb now and worth the few extra bucks.


To the OP: Your speed envelope is insane you are trying to build a jet with a couple of wings and a 4 inch tube? 25mph? I would suggest having a read up on rcgroups forum foamie jet section to see some average setups being used. I have not seen a 90mm jet under 75-80mph even with a very mild 1200w system (and 1200w is practically unheard of these days, most start with 14-1500w)

Models like the Topgun Mirage are usually cheaper than all the materials needed to build something! The Mirage is an excellent flyer, delta wing, the fan unit it comes with is not bad and you can order a factory fan/motor combo that is factory assembled and balanced, the motor is made by the hacker factory and is good quality. This is a 6 cell combo that produces close to 2.5kg thrust at 55 amps, you can get away with a cheap HK battery, 4000mah 6s 30c is all you need, and a good quality 60A esc is not expensive these days, can also be supplied in the kit by Topgun.
 
By the time you have bought a Midifan, budget motor to run it, all the extra gear you will have spent a lot more than a factory Mirage package. You can see the Topgun products HERE, gives you an idea of what I am talking about. I know some people like to build their own but it sounds more like you are approaching this due to female constraints, end of the day a good 90mm foam kit is more cost effective.

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RE: HET 9305 or Wemotec midi - 11/18/2010 1:27 AM   
alanjets


 

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Status: offline 		i thort of getting the wimotec fan but i have now got a 700-68 1680 het motor and they dont fit wimotec i think.thanks u for the advise its good to have someone who no's what they are doing new i should of got a p20 for it lol cheers

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RE: HET 9305 or Wemotec midi - 11/19/2010 3:52 PM   
alanjets


 

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Status: offline 		extreme rc that MIRAGE 2000 u have flying is that the site where Craig Dawson fly's his fly eagle f18. i think im going to change to a midi fan i think

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