Multiplex Funjet Ultra - Page 67 - RC Groups
Thread Tools
Jan 09, 2011, 02:48 AM
Jets & Lasagna...champion diet
T-CAT's Avatar
I'm excited to get this jet in the air. I just picked up the kit at the AMA show for $93 and change. Not bad at all.
Sign up now
to remove ads between posts
Jan 09, 2011, 02:52 AM
Registered User
Jurgen Heilig's Avatar
Quote:
Originally Posted by SpoonEK
I intend to give 6x4 a try with 2w20 on 4s. How do i know when the motor is running inefficiently?
Use 3s or you will fry your motor.

Jürgen
Jan 09, 2011, 02:56 AM
Jets & Lasagna...champion diet
T-CAT's Avatar
Has anyone tried the MB-1 motor on 4S yet with the Funjet? I was going to test it on 4S with a 4.75X4.75 or 5.1X4.1 or something similar. The motor is 3200kv, but I have no idea what to expect with a prop on it considering the motor is normally used for EDF's.
Jan 09, 2011, 08:23 AM
Bipe addict.
rapz0r's Avatar
Quote:
Originally Posted by rapz0r
Thanks for the advice, I'll measure the "jet nozzle"(lol) position to the wing, and recheck the mount. I am pretty sure that motor sits perfect, since I payed attention to that aluminum plate being straight and I loctited the bolts.

However I am not so sure about how plate sits on the black thingy.

I'll try to get it straight, however I'm affraid it is going to take a while to test fly it, since the grass runway where I fly is in bad condition, frozen, and last time I landed my FJ it got some nasty scars on the belly.

And broke one servo arm off. (My fault, I didn't put servo covers on - I have now.)
I checked the mount, it obviously wasnt sitting straight. I fixed it, now it is 0/0 degree angle.

I emptied four packs today, torque roll is reduced significantly, however it is still present. I will adjust the motor to add a bit of downthrust and try it, I hope I can get rid of torque roll completely.
Jan 09, 2011, 09:00 AM
Registered User
dogshome's Avatar
Quote:
Originally Posted by rapz0r
I checked the mount, it obviously wasnt sitting straight. I fixed it, now it is 0/0 degree angle.

I emptied four packs today, torque roll is reduced significantly, however it is still present. I will adjust the motor to add a bit of downthrust and try it, I hope I can get rid of torque roll completely.
Glad you fixed it
Jan 09, 2011, 09:07 AM
Registered User
dogshome's Avatar
Quote:
Originally Posted by Jurgen Heilig
Use 3s or you will fry your motor.

Jürgen
He's right.

3300KV will need a 4.5" prop max. You're doing 40,000+ RPM on 4S.


Inefficiency will mean a large drop in RPM compared to no load RPM, heat, more heat and then smoke
Jan 10, 2011, 11:10 AM
You down with EPP?
johnnyrocco123's Avatar
As Mid January nears....... Will Tower Hobbies move back the date for the 10th time???? Stay tuned.
Jan 10, 2011, 01:11 PM
Registered User
hello guys,

I'm planning to buy an FJ Ultra aswell, and would like to fly it with 4S 2650 35-70C Turnigy Nano-Techs. Wich motor (preferably a turnigy or something comparable)

I'd like to use a 60A ESC, but I also can use a 80A if needed. I would like to have a velocity about 200 km/h

greetings,
Fabian
Jan 10, 2011, 01:54 PM
Registered User
Fabian

HET 2W-25 on a 6 X 5.5 prop and running 4S , its a really quick set up.
Jan 10, 2011, 02:02 PM
Jets & Lasagna...champion diet
T-CAT's Avatar
I am thinking of ditching my 4S set-up with the 3200kv Sapac MB-1. It may work =, but I am doubting myself. I have received great advice from board members and I think I may still try it out with a 5X5 APC or 4.75X4.75. However, this HET 2W-25 on 4S with 6X5.5 prop seems to be highly recommended by lots of members.

Now, I have the aluminum motor mount from multiplex. Would the aluminum mount fit the bolt pattern of the HET 2W-25 motor?

Also, can the 2W-25 setup mentioned take the Ultra 140+mph?
Jan 10, 2011, 04:17 PM
Registered User
@shepski

which ESC should i use with the 2W-25 on 4S?
Jan 10, 2011, 08:13 PM
"Where are the shovels?"
wise guy's Avatar
Anyone have them in stock yet?
Jan 10, 2011, 08:35 PM
Registered User
I'd advise you stay away from the APC 5x5 prop. It doesn't seem to have very good performance. From the ritewing thread, we've had lots of success with the "magical" APC 6x4 Sport prop (as opposed to the 6x4 electric). But as with anything, stick the setup through a wattmeter before you go out flying.

Quote:
Originally Posted by T-CAT
I am thinking of ditching my 4S set-up with the 3200kv Sapac MB-1. It may work =, but I am doubting myself. I have received great advice from board members and I think I may still try it out with a 5X5 APC or 4.75X4.75. However, this HET 2W-25 on 4S with 6X5.5 prop seems to be highly recommended by lots of members.

Now, I have the aluminum motor mount from multiplex. Would the aluminum mount fit the bolt pattern of the HET 2W-25 motor?

Also, can the 2W-25 setup mentioned take the Ultra 140+mph?
Jan 10, 2011, 09:25 PM
Registered User
Quote:
Originally Posted by johnnyrocco123
As Mid January nears....... Will Tower Hobbies move back the date for the 10th time???? Stay tuned.
http://cgi.ebay.com/Multiplex-M21424...item5ade7870ba
Jan 10, 2011, 09:55 PM
Jets & Lasagna...champion diet
T-CAT's Avatar
Quote:
Originally Posted by hawkz
I'd advise you stay away from the APC 5x5 prop. It doesn't seem to have very good performance. From the ritewing thread, we've had lots of success with the "magical" APC 6x4 Sport prop (as opposed to the 6x4 electric). But as with anything, stick the setup through a wattmeter before you go out flying.
Thanks Hawkz. I'm assuming you are recommending to stay away from the 5X5 prop on either set-up I may use. Thank you for the heads up. I have never used one, so that's good to know. I'll do some research on it. I am worried a 6X4 using 4S with a 3200kv motor will fry that motor into pieces, lol. That's why I am thinking of moving to the HET 2W-25 on 4S .


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion Funjet Ultra, more fast more fun.... tbmg1 FPV Talk 34 Jul 28, 2010 09:36 AM
Discussion Muliplex EasyStar WBFlyer FPV Talk 9 Mar 10, 2010 04:09 PM
Sold muliplex ASW 27 NIB bushpilotx1 Aircraft - Sailplanes (FS/W) 7 Aug 31, 2009 06:41 PM
Question Muliplex Alpha Junior Radio Instalation Allan Glover Sailplane Talk 3 Apr 09, 2004 02:37 AM
Muliplex MultiCharger 4010DC - is mine faulty ? borgs Batteries and Chargers 0 Jul 12, 2003 08:01 AM