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Old Jun 24, 2012, 12:04 AM
This is BAT country!
Gonzo 1971's Avatar
United States, MI, Ovid
Joined Nov 2003
579 Posts
Is anyone having issues with the motor rubbing on the foam in the nose? just replaceded the motor shaft. The motor spins fine. I mount the motor back in and it seems to have a lot of drag.
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Old Jun 24, 2012, 02:22 AM
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dk31's Avatar
Athens
Joined Oct 2009
617 Posts
Quote:
Originally Posted by M.Gonyea View Post
Is anyone having issues with the motor rubbing on the foam in the nose? just replaceded the motor shaft. The motor spins fine. I mount the motor back in and it seems to have a lot of drag.
I have a 3536 and when I first installed it, the foam in the nose (around motor bell) needed just a little filing. If you have already glued the fuselage, you can put out the motor and scratch a little foam off with the edge of a small file.
Now, if you didn't have this issue before, check the alignment of the motor.
-You may have place the firewall upside down (check if the motor points upwards instead of downwards)
-You may have change the position of the 4 screws controlling down/right motor thrust. If so you may have to scratch-off a little more foam to keep the motor bell clear

Last, if you had a crash, you may need to replace the motor bearings too. I keep a stock of bearings and shafts for every motor I have, so that I don't need to order/wait every time I crash. For cheap bearings, e-bay is your friend-just type the correct dimensions and search for 5 or 10 item lots.

I Hope that helps a little...
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Old Jun 24, 2012, 02:59 AM
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dk31's Avatar
Athens
Joined Oct 2009
617 Posts
Many posts about using 3542 or 3548 motors. Why not using a 28xx for longer flights and smooth scale flying?
I have been flying with a 3536-910kV (310watts) spinning 11x7 props for 2 years, and I would prefer longer/smoother flights (from the current 10mins).
Also theory says 100-150watts/kilo for trainers. I have bench-tested my motor-prop combination and it gives ~280watts and ~1300gr of thrust.
Last, COG is off with my 110gram motor, and won't fix nomatter how far back i put the battery
Can anyone that has chosen a lighter setup or has tried various motors chime in and help ?
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Old Jun 24, 2012, 05:41 AM
Rookie
planex's Avatar
Australia, VIC
Joined Jun 2011
1,204 Posts
Quote:
Originally Posted by dk31 View Post
Many posts about using 3542 or 3548 motors. Why not using a 28xx for longer flights and smooth scale flying?
I have been flying with a 3536-910kV (310watts) spinning 11x7 props for 2 years, and I would prefer longer/smoother flights (from the current 10mins).
Also theory says 100-150watts/kilo for trainers. I have bench-tested my motor-prop combination and it gives ~280watts and ~1300gr of thrust.
Last, COG is off with my 110gram motor, and won't fix nomatter how far back i put the battery
Can anyone that has chosen a lighter setup or has tried various motors chime in and help ?
My 3542 NTM 1000kv with a 3s 2200 pack, 11x5.5 APC prop and 50a ESC gets me 17 minutes fairly easily. I wouldn't get a 28mm to swing an 11 or 12 inch prop, surely it wouldn't last long plus you would want minimum 4mm shaft
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Old Jun 24, 2012, 07:34 AM
Fly Seaplanes
Fviking's Avatar
Sandy Hook, CT.
Joined Jun 2009
105 Posts
Size matters

Motor size. The recommended size motor for the FunCub is a 3530. I found an inexpensive SK3- 3530 1150kv 4mm shaft, from Turnigy, and It flies the cub in a scale manner very nicely, But if you are trying for those short landings and need to pull out the SK3 3536 1050kv with a 5mm shaft does a great job.

CG no problem with either motor with 1800 mAh 3 cell and an 11 X 5.5 ACE prop

I did have some problem with the motor rubbing in the nose of the plane. I simply removed the prop and spun the motor up, then squeezed the nose top to bottom, listened to the motor slow down some and held it for a few seconds, Then checked it, if it didn't clear I repeated The squeeze, The friction from the motor heats the foam up and it shrinks, at least that is how I think it works.

Great Fun plane;
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Old Jun 24, 2012, 12:56 PM
This is BAT country!
Gonzo 1971's Avatar
United States, MI, Ovid
Joined Nov 2003
579 Posts
Thanks. I could not see it rubbing anywhere! We will see how it works this evening. Good call on the bearings though. Should order some up. Buying second hand was a bad idea. Fixing lots of stuff. Once I get it dialed in I will get it spiffed up. Wing struts and some paint. Can't wait to fly it tonight. Got my rev y in last night. Flap time!
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Old Jun 24, 2012, 01:13 PM
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Van Leuven's Avatar
Joined Jan 2011
87 Posts
Quote:
Originally Posted by B dog View Post
I looked up the size of the 81's and they are indentical to the 82MG's and that servo will not fit into the wing cut outs. The HS-55's do fit but have some wiggle room. So my question is when you say, "I use the 55's on some lighter models" are you telling my not to use the HS-55's? Again I was planning on using these for the aleron and flaps only, 82MG's for the tail control.
TIA,
Brian
I used 81's for the tail and 65's for the wings and all fit perfectly.
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Old Jun 24, 2012, 03:11 PM
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dk31's Avatar
Athens
Joined Oct 2009
617 Posts
Quote:
Originally Posted by planex View Post
My 3542 NTM 1000kv with a 3s 2200 pack, 11x5.5 APC prop and 50a ESC gets me 17 minutes fairly easily. I wouldn't get a 28mm to swing an 11 or 12 inch prop, surely it wouldn't last long plus you would want minimum 4mm shaft
I have already ordered a Turnigy D2836/9 950KV (4mm shaft/ 240watts) . It will save me ~40grams of weight in the nose, and my first trial will be with a 10x6 APC. I will report back any improvement

@FViking:
I don't get how you managed to balance it. I currently have a 3536 and puting the 2200 25C battery all the way back in the battery tray, tha plane is stil nose heavy...
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Old Jun 24, 2012, 04:04 PM
This is BAT country!
Gonzo 1971's Avatar
United States, MI, Ovid
Joined Nov 2003
579 Posts
My 2200 3s pack hangs back into the vent hole a bit. It only takes a very small amout of weight back by the tail to ballance. I really would not want any less power. Just a bit more would be better. I wanna hang it on the prop and do all kinds of sill stuff. Need to increase all my throws as well. I think it will be a hoot one dialed in.
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Old Jun 24, 2012, 05:54 PM
Seafax ROV
WalneyCol's Avatar
United Kingdom, Barrow-in-Furness
Joined Feb 2011
371 Posts
oops, new shaft needed

Ill Bell Multiplex Funcub Oops! (2 min 6 sec)


Col.
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Old Jun 24, 2012, 09:37 PM
I will do it all eventually
aeronb's Avatar
United States, OR, North Plains
Joined May 2012
62 Posts
Another motor vibration problem solved. I built a bulkhead style mount out of 3mm ply with a cople of braces to a new plywood floor. If I had known how easy it was going to be I'd have done it earlier. As a side benefit, the ply floor makes for much better places to mount the ESC and easier battery placement.

I had the vibes from the first time I ran the motor up on the bench at about 60% throttle. I didn't know what was going on so I just lived with it till I lost my canopy in the tall grass (never could find it). After reading about some of the fixes applied by the fine folks here, I felt like I had a handle on this. Flew it for about an hour today with full throttle available to me for the first time. Awesome.

Thanks for all the great ideas.
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Old Jun 25, 2012, 02:27 PM
Complete the Illusion!
35Mhz's Avatar
UK South Coast
Joined Oct 2003
270 Posts
Finally got a bit more Air time with the FunCub today, I moved the CG forward to nearer the 65mm mark (from 75mm), and it seems much happier and stable.

It using a 920kv EMAX 2815 motor on a 11x5.5 prop and 3000mah 3S battery, no shortage of power or duration, was going to try an 11 x 7 but will leave that for another day.

Here are a few shots now its fully finished, and a few of the painting using Dulux tester pots from the local DIY store, mixed to International Orange. Anyone interested in Paint Codes for Mixing, I have posted up on my Website http://www.modelmarkings.com a Paint chart of Common RAF colours, with the NCS mixing code I will be Adding more colours shortly.
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Old Jun 25, 2012, 02:33 PM
& #@$ it, Dude. Let's go flyin
dropkickjohnny's Avatar
United States, NH
Joined Sep 2010
52 Posts
Hey All,

Finally got to installing the floats I had kicking around on the Fun Cub. They seem to be a bit forward of the stock floats position, but they work just fine. Check it out...

Multiplex Fun Cub - Sunset Water Flights (2 min 57 sec)


Water Flights with the Parkzone Icon A5 and the Multiplex Fun Cub (5 min 28 sec)
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Old Jun 25, 2012, 02:39 PM
Registered User
Starving Bushman's Avatar
United States, VA, Alexandria
Joined Nov 2011
492 Posts
Just finished painting my Fun Cub and I am wondering how important it is too clear coat it. If I don't will the paint easily wear off?
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Old Jun 25, 2012, 02:58 PM
Complete the Illusion!
35Mhz's Avatar
UK South Coast
Joined Oct 2003
270 Posts
I used a matt water based varnish on mine to seal in the Orange, definitely gives a harder wearing and neat finish. I recommend not brushing, too uneven a finish! I used a mini paint roller, spraying works as well
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