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Oct 04, 2017, 04:59 PM
SPAD VII Lover
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Cobalt 05 Replacement (Turnigy)


Hello everyone, I am building a vintage kit that was flown with a Cobalt 05. With a limited budget, I would like to purchase a Turnigy equivalent motor. Can you please give me a choice of motors I can purchase which you feel is equivalent to the Cobalt 05? Many, many thanks. Chic
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Oct 04, 2017, 07:34 PM
I am a nice guy! Really!
Assuming you are talking about the Astro Flite 05 Cobalt, here are a few possibilities:

https://hobbyking.com/en_us/ntm-prop...t-version.html

https://hobbyking.com/en_us/propdriv...ner-motor.html

https://hobbyking.com/en_us/d2826-10...ess-motor.html

A better way would be to tell us what model it is and some particulars about it such as wingspan, wing area and flying weight. Also what sort of aircraft it is; scale, sport aerobatic, trainer etc. Sometimes it is better to start with that and choose a prop/battery/motor combination from that info.

One thing that might be a problem is that the new power system will be lighter than the original and you may run into balance issues. These can usually be addressed by battery size and position but it is something to consider early on rather than be surprised at the end.
Oct 07, 2017, 09:30 PM
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vollrathd's Avatar
Quote:
Originally Posted by Chic3r
Hello everyone, I am building a vintage kit that was flown with a Cobalt 05. With a limited budget, I would like to purchase a Turnigy equivalent motor. Can you please give me a choice of motors I can purchase which you feel is equivalent to the Cobalt 05? Many, many thanks. Chic
I've had three Astro 05 motors running on a seven cell RC2400 NiCad battery pack. They were pulling around 25 Amps, or around 175 Watts. The model was the ElectroStreak popular in the late 1990's. I modified one of them with aluminum fins pressed onto the motor housing for cooling. It still ran danged hot.

A brushless motor around 250, 300 watts would be a good choice, allowing much more power delivered to the prop, with the same flight times.

Tower Hobbies has a wide variety of brushless motors in this power range. The Rimfire motors appear to be of good quality. Here is one motor brand I've never heard of, but it has a decent price. The Tower motor uses the very popular 3S LiPo batteries, perhaps around 2200 mah.

https://www.towerhobbies.com/cgi-bin...&I=LXAUTG&P=ML
Oct 08, 2017, 02:47 PM
I am a nice guy! Really!
There are a few ways to go with the power system. One would be the motors I suggested, which will deliver about the same power as the original Astro 05. The other is as you suggested, going with a power system of the same weight, able to deliver much more power and endurance.

The third would be to start with a clean piece of paper and determine what the power requirements are for the plane and the desired flying style. Then select components that will fit.


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