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Aug 12, 2010, 08:31 PM
"the bouncer"
mackone's Avatar
Mine's still in transit since the 4th
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Aug 12, 2010, 09:14 PM
New to RC Flying
Jack_Chen's Avatar
Quote:
Originally Posted by cgoffa
Second day report on my, I melted, yes MELTED the plastic mount the little outrunner sits on, I had to carefully pry the red plastic nose cone off, I used my dremel to cut all three tabs off and file it down, then I had to make a 1/4 inch plywood circle from 2/32 ply and put a turnigy 35/42/1000 inside it, oh and I had to do some clearance-ing to clear the back of the can and the wires, I will find out how this flies tomorrow,


PS I think running a giant 2 cell or small three cell wrapped in lead would have let the motor live, and still given good climb
how did you melt the plastic mount? Run it too hot? I realised the motor is for you to climb gently, not one for vertical climb.

it's a nice foamie, who knows someone might choose to glass the body and wings as a cheap competitor to fibreglass gliders.
Aug 12, 2010, 09:40 PM
Registered User
cgoffa's Avatar
I didnt melt the motor, i melted the plastic mount it attaches to, the motor in the mini moa is a 24mm diamter hobbyking bell shaped can outrunner, it has an aluminum base with 3 screws mounting it to the plastic tabs inside the red nose cone. There is no airflow over it, and running on their power system and recomended 2200 mah 20 c battery it cooked the plastic in less than 5 minutes run time spread out over 35 minutes of flight. this CG is barely flyable, as the glider is very pitch sensitive under power, but the glide is phenomenal power off.


Quote:
Originally Posted by Jack_Chen
how did you melt the plastic mount? Run it too hot? I realised the motor is for you to climb gently, not one for vertical climb.

it's a nice foamie, who knows someone might choose to glass the body and wings as a cheap competitor to fibreglass gliders.
Aug 13, 2010, 12:16 AM
Sic transit gloria
Quote:
Originally Posted by cgoffa
I didnt melt the motor, i melted the plastic mount it attaches to, the motor in the mini moa is a 24mm diamter hobbyking bell shaped can outrunner, it has an aluminum base with 3 screws mounting it to the plastic tabs inside the red nose cone. There is no airflow over it, and running on their power system and recomended 2200 mah 20 c battery it cooked the plastic in less than 5 minutes run time spread out over 35 minutes of flight. this CG is barely flyable, as the glider is very pitch sensitive under power, but the glide is phenomenal power off.
Any suggestions to avoid this from happening?
Aug 13, 2010, 01:42 AM
" Plain Crazy! "
Hondajet's Avatar
Quote:
Originally Posted by MAX FISCHER
Any suggestions to avoid this from happening?
I will be drilling some 4mm (3/16") holes on the spinner backplate...then neatly
enlarging the area where the prop blades meet the spinner hub ....so that flow thru ventilation can access the bell motor.

The Spinner does lever of with gentle coaxing with a small Jewelers Screwdriver.

I had the same problem with the ST Models ASW28.

This mod was the most obvious to be done as the motor virtually has no cooling access!

Will post some pics when I get down to it!

HJ
Aug 13, 2010, 01:55 AM
Good Better Best quest.
olmod's Avatar
Quote:
Originally Posted by cgoffa
I didnt melt the motor, i melted the plastic mount it attaches to, the motor in the mini moa is a 24mm diamter hobbyking bell shaped can outrunner, it has an aluminum base with 3 screws mounting it to the plastic tabs inside the red nose cone. There is no airflow over it, and running on their power system and recomended 2200 mah 20 c battery it cooked the plastic in less than 5 minutes run time spread out over 35 minutes of flight. this CG is barely flyable, as the glider is very pitch sensitive under power, but the glide is phenomenal power off.
Am I right in guessing that glide trim is ok but under power it wants to climb to much ? if this is the case it requires downthrust.
might pay to use expo on the rudder or reduced throws.
how are the allerons sensitive also?.
Aug 13, 2010, 04:53 AM
WAA-08 THANK FRANK!
JimNM's Avatar
Thanks for taking the time to post. I am loooooking at this one.
Aug 13, 2010, 06:35 AM
Good Better Best quest.
olmod's Avatar
Quote:
Originally Posted by MAX FISCHER
Any suggestions to avoid this from happening?
You could try a smaller folder with a turbo hub ,it will draw less current = cooler. what size is the prop? and spinner hub diameter?.shaft size?.
Aug 13, 2010, 09:04 AM
Which way is up?
Quote:
Originally Posted by olmod
Am I right in guessing that glide trim is ok but under power it wants to climb to much ? if this is the case it requires downthrust.
might pay to use expo on the rudder or reduced throws.
how are the allerons sensitive also?.
I would think since the motor is only run occasionally, that either mixing down elevator with the throttle use or holding down as needed would be workable. This would save having to modify the mounting of the motor.

Jim
Aug 13, 2010, 09:07 AM
Which way is up?
Quote:
Originally Posted by Hondajet
I will be drilling some 4mm (3/16") holes on the spinner backplate...then neatly
enlarging the area where the prop blades meet the spinner hub ....so that flow thru ventilation can access the bell motor.

The Spinner does lever of with gentle coaxing with a small Jewelers Screwdriver.

I had the same problem with the ST Models ASW28.

This mod was the most obvious to be done as the motor virtually has no cooling access!

Will post some pics when I get down to it!

HJ
Appreciate your offer of pics of the cooling mod.

I just received email stating that they're packing mine up and getting ready to ship.

I enjoy my radian but if this flies close to as well as the radian, I'll be very happy as I like the look of this model better.

Jim
Aug 13, 2010, 09:51 AM
" Plain Crazy! "
Hondajet's Avatar
Quote:
Originally Posted by jbird
Appreciate your offer of pics of the cooling mod.

I just received email stating that they're packing mine up and getting ready to ship.

I enjoy my radian but if this flies close to as well as the radian, I'll be very happy as I like the look of this model better.

Jim


Here they are Jim...

I have yet to maiden mine....weather too stormy here at present...but I still have to get a AR7000 rx for it as well.

Posted pic of recommended COG and I still had to add 70g of nose weight to get it to balance at the 54mm mark....with a 3s 2250 Rhino batt on board.

I will be using a lot of expo on the control surfaces to dampen all that over controlling as the control surfaces are huge!

Louis
Aug 13, 2010, 09:59 AM
Which way is up?
Quote:
Originally Posted by Hondajet
Here they are Jim...

I have yet to maiden mine....weather too stormy here at present...but I still have to get a AR7000 rx for it as well.

Posted pic of recommended COG and I still had to add 70g of nose weight to get it to balance at the 54mm mark....with a 3s 2250 Rhino batt on board.

I will be using a lot of expo on the control surfaces to dampen all that over controlling as the control surfaces are huge!

Louis
Looks good. I'm just thinking out loud......wondering if a hole in the center of the spinner would help with air into that area. Wouldn't look as good but if not too big, might not be real noticeable.

Also, where does the battery sit in relation to the cg?

I was thinking of using a smaller battery but don't need to agravate the cg problem and needing more nose wt.

Jim
Aug 13, 2010, 10:24 AM
" Plain Crazy! "
Hondajet's Avatar
Quote:
Originally Posted by jbird
Looks good. I'm just thinking out loud......wondering if a hole in the center of the spinner would help with air into that area. Wouldn't look as good but if not too big, might not be real noticeable.

Also, where does the battery sit in relation to the cg?

I was thinking of using a smaller battery but don't need to agravate the cg problem and needing more nose wt.

Jim
Here is another cooling pic I forgot to post.

The battery sits forward of the COG and its weight is needed to balance the Minimoa.

She is totally aft COG without any adjustment! I would not worry about weight at this stage and you will probably need to add some to balance LEVEL at the 54mm mark.

You could put a hole in the front of the spinner....but it will spoil the static looks! The openings I have shown in the spinner mods at the prop hubs is more than adequate and will definitely cool the motor with airflow from normal flight.

HJ
Last edited by Hondajet; Aug 13, 2010 at 10:43 AM.
Aug 13, 2010, 12:04 PM
Registered User
voodootv's Avatar
Thanks HJ for posting your Minimoa mods - most interesting!

Can't wait for mine to arrive - huh, it that the doorbell???
Aug 13, 2010, 12:20 PM
Registered User
voodootv's Avatar
It has arrived! All looks good - but missing instructions!

Will link to Art-Tech site and download their pdf manual.


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