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        Discussion Monster Power and Tacon Bigfoot motors

#1 Melnic Mar 13, 2010 08:47 PM

Monster Power and Tacon Bigfoot motors
 
I've been using some Monster Power 15 motors and just got in a Monster Power 60. It's going into a plane that would be fine with a 46 but I'm going to use a 60 and push just over 800 watts with it.
Got it from Hobbypartz

Hobbypartz Coupon codes
NOTE:
If you don't see the Monster Power Motor you want, try the Tacon Bigfoot from Hobbyparts because they are sized the same and I feel the bearings are better than the Monster Power. Tacon is green but he spinner is silver instead of Blue.

Monster Power 60 Review (4 min 54 sec)

#2 HEMICUDA Mar 14, 2010 01:04 AM

I have been thinking about getting the monster 25 or 32 for my Sig Seniorita.I don't know if I'm gonna run my 4s 5000mah 20c or order some 3s 5000mah 20c
Is the 25 enuff or should I go alittle bigger with the 32? Have you had good success with the brand? I know they are a good deal $-wise

Hemicuda

#3 Melnic Mar 14, 2010 08:30 AM

Is this designed for nitro? if so ,what size?
Do you know the weight of the plane when with a Nitro?

#4 Zagabond Mar 14, 2010 10:04 AM

I have a monster power 46
 
I have been using the Monster Power 46 in my Ultra Stick for over a year now. It works great. Cheap motor, seems ok. I prefer to buy the better motors, but was low on cash when I got that one. Not bad for $50.00.

#5 bassmanh Mar 14, 2010 10:14 AM

zagabond,

where did you buy your motors from ? if you buy them from hobbypartz there a bit cheaper than at nitroplanes. at HP the 46 is only $28.99 and the 60 size is only $35.40
and shipping is a flat $4.99.


here is a link to there site = http://www.hobbypartz.com/mopose.html

i now have 5 of these great little motors and all seem to work well.


bass

#6 Xpress.. Mar 14, 2010 10:47 AM

Quote:

Originally Posted by Melnic (Post 14590667)
Is this designed for nitro? if so ,what size?
Do you know the weight of the plane when with a Nitro?

Do your calculations correctly, then anything will work in a plane designed for that oily messy nitro stuff ;) :p

#7 Dr Kiwi Mar 14, 2010 11:37 AM

Quote:

Originally Posted by HEMICUDA (Post 14589545)
I have been thinking about getting the monster 25 or 32 for my Sig Seniorita.I don't know if I'm gonna run my 4s 5000mah 20c or order some 3s 5000mah 20c
Is the 25 enuff or should I go alittle bigger with the 32? Have you had good success with the brand? I know they are a good deal $-wise

Hemicuda


I think we decided a .32 was the way to go...... a Seniorita should come in at about 5lb.

#8 Melnic Mar 15, 2010 09:28 AM

Has anyone ever created a prop table showing RPM and thrust?
You'd think this would be possible.
I know electric motors tend to be trial and error showing Voltage, RPM vs. Prop, but you'd think you could make a plot of RPM vs. Thrust (in grams) with any prop and using a test set up and an electric motor?

I wonder if it's possible to then convert thrust to output power in WATTS, and then back convert guessing on efficiency of the motor. A motor will have a certain efficiency (peak RPM vs. Kv) curve leading up to it's specified wattage. (am I saying this right?). For example, that Monster power motor might free spin at 22V up to 8800RPM, but under an 800W load it's closer to 8200RPM (93% efficiency). If I put a larger prop, the thrust increases, current increases, but efficiency goes down. I suspect that most motors that curve is pretty close from motor to motor (some will do better than others).

Anyone know what I'm talking about? I spend most my time with Electric helis although I have about 5 Electric planes and propped them based on suggestions from other people. I'd like to understand more of the theory.

Maybe I don't fully understand how it all works but maybe someone can give me a reference to use?

Any generic tables out there one could reference?

#9 gnofliwr Mar 15, 2010 11:18 AM

I thought I'd weight in on the Exceed-RC motors.

I have several (a couple 32's & a couple 480's) in planes and two more 32's waiting to go into a twin I'm reserecting. They're really well built motors. They're about 10% heavier than the E-Flite motors of the same designation.

Also, HobbyPartz appears to be a part of Nitro Planes (the PayPal billing showed Nitro as the recipient, and there's a link from Nitro Planes site). However, the prices at HP are lower than at NP and the flat-rate shipping is lower.

- Roger

#10 Oldgzr Mar 15, 2010 11:24 AM

1 Attachment(s)
Melnic, this test stand setup looks like it would be a good tool to accomplish what you are looking for. They are sold by BP Hobbbies or you could make your own test stand and purchase the same scale at Harbor Freight. You could run the motor/prop setup and monitor it with a wattmeter and digital tachometer.

http://www.bphobbies.com/view.asp?id=A0320107

#11 Melnic Mar 15, 2010 11:39 AM

Looking at Dr. Kiwi's other posts, it looks like he's done some work in this arena and I may need to just keep looking.
I also found this very helpful thread.
http://www.rcgroups.com/forums/showthread.php?t=1155283

I know that static thrust does not always equate to how it might fly in the air when it unloads but it sure is useful information when someone is trying to make a plane have good 3D/vertical performance.

#12 HEMICUDA Mar 17, 2010 02:27 AM

Dr Kiwi,

Thanks, I was leaning to the 32 so that's good.

Melnic,

It the EP version, 63" wingspan 5-5 1/2 lbs. I heard 25's,32's and 46's
size motors (brushless outrunners) are what people are using. I was leaning towards the moster power motor from Hobbypartz and also looking at the same size motors from Headsuprc.

Hemicuda

#13 Melnic Mar 17, 2010 09:53 AM

Now that I look around enough, I see there are a bunch of motor calc programs for airplanes where they list props like the APCe props and give thrust values at given RPMS. That really helps alot.

I over power my planes myself but since that kit in a Nitro calls for a .25, a 32 sounds like you'll have what you need. it's just a matter of the right prop to go with the 3S or 4S batteries that you have. Will both Fit?

#14 MikeRx Mar 17, 2010 11:10 AM

800 watts on a 6lb (what its really gonna be) plane is marginal higher performance. Any good 60 should pull over 1000 watts... look to more cells for this one. Im thinking 6..and if you really want to go for efficiency, look at what VOX wood propellers are doing on thrust 50 motors pulling less than 70 amps...10.5 lbs of thrust!
on 2 regular 2200 3s.. or look what torque motors of similar weight are doing on 5 cells....

#15 Melnic Mar 17, 2010 12:23 PM

Quote:

Originally Posted by MikeRx (Post 14618720)
800 watts on a 6lb (what its really gonna be) plane is marginal higher performance. Any good 60 should pull over 1000 watts... look to more cells for this one. Im thinking 6..and if you really want to go for efficiency, look at what VOX wood propellers are doing on thrust 50 motors pulling less than 70 amps...10.5 lbs of thrust!
on 2 regular 2200 3s.. or look what torque motors of similar weight are doing on 5 cells....

Who's plane are you refering to? Mine or Hemicuda.
His is a high wing trainer type, so I don't think he's looking for all that much power.


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