Re: z-37 cmelak, rc electric to nitro conversion

microflitedude Sat Feb 04, 2012 8:42 am

Perhaps a TD .020 would be a good solution? Light, and very powerful.

John Goddard Sat Feb 04, 2012 9:27 am

Another thing to consider with smaller engines is smaller
Props. Which create much less prop wash over the control
Surfaces.
So nightmare scenario,-
Large plane which by virtue of small engine travels slowly
Through the air, without much prop wash = sluggish response
To controls as well as lacking fun factor.
IMO
Huh...

nitroairplane Sat Feb 04, 2012 9:52 am

Yup John big control surfaces are FFUUNN!

Ivanhoe Sat Feb 04, 2012 11:24 am

Starting with the fact that I know NOTHING about electric motors, I read that a 100 watt lekkie is equal to an .049, no idea what the wattage of the original motor in this model was, but I'm sure someone here will know.

Just my contribution

Wilf

microflitedude Sat Feb 04, 2012 11:48 am

Ivanhoe wrote:Starting with the fact that I know NOTHING about electric motors, I read that a 100 watt lekkie is equal to an .049, no idea what the wattage of the original motor in this model was, but I'm sure someone here will know.

Just my contribution

Wilf

I have found .049's to have the around the same power as 400/450 size motors.

mitchg95 Sat Feb 04, 2012 5:32 pm

cool, well i had that airplane weighed at a lhs, it came in at 17.5 oz, i used futaba s3003 and a futaba fp-s148 servos, a futaba nr-4qb 600 mah battery, and a old ner-327x reciever. i know that these electronics are way over kill (all electronics weighed in at 7.50oz) good starting point, im going to get 8g servos, i think ill be in the 12-14oz range

microflitedude Sat Feb 04, 2012 5:37 pm

mitchg95 wrote:cool, well i had that airplane weighed at a lhs, it came in at 17.5 oz, i used futaba s3003 and a futaba fp-s148 servos, a futaba nr-4qb 600 mah battery, and a old ner-327x reciever. i know that these electronics are way over kill (all electronics weighed in at 7.50oz) good starting point, im going to get 8g servos, i think ill be in the 12-14oz range

I would use 9g servos, unless the 8g you are talking about have metal gears. Make sure they don't twitch/flutter!

John Goddard Sat Feb 04, 2012 5:38 pm

Ivanhoe wrote:Starting with the fact that I know NOTHING about electric motors, I read that a 100 watt lekkie is equal to an .049, no idea what the wattage of the original motor in this model was, but I'm sure someone here will know.

Just my contribution

Wilf

The Tee Dee is about the best Cox at over 75 Watts Wilf.
I think the bees vary from 45 up to about 60.
I dout it was the sort of model anyone ever put at watt meter on but I could be wrong.
Huh...

mitchg95 Sat Feb 04, 2012 5:40 pm

what 9g servo should i use, and are there any preety cheep? i dont have alot of cash right now unforonatly

nitroairplane Sat Feb 04, 2012 5:46 pm

[quote="John Goddard"]

Ivanhoe wrote:Starting with the fact that I know NOTHING about electric motors, I read that a 100 watt lekkie is equal to an .049, no idea what the wattage of the original motor in this model was, but I'm sure someone here will know.

Just my contribution

Wilf

The Tee Dee is about the best Cox at over 75 Watts Wilf.
I think the bees vary from 45 up to about 60.
I dout it was the sort of model anyone ever put at watt meter on but I could be wrong.
Huh...

[/quo
I heard the glow engine watts are somehow different to the lekkie watts.

microflitedude Sat Feb 04, 2012 5:51 pm

mitchg95 wrote:what 9g servo should i use, and are there any preety cheep? i dont have alot of cash right now unforonatly

It depends....

I use these in my .049 Cub. They are high torque.

http://www3.towerhobbies.com/cgi-bin/wti0001p?&P=SM&I=LXPAC3

mitchg95 Sat Feb 04, 2012 6:55 pm

that looks pretty good, thank you, it might be a few weeks before its rtf, would a erc 6g servo work?

microflitedude Sat Feb 04, 2012 7:06 pm

mitchg95 wrote:that looks pretty good, thank you, it might be a few weeks before its rtf, would a erc 6g servo work?

Do you have a picture or link?

mitchg95 Sat Feb 04, 2012 7:10 pm

my family and i are goin out of town for a week, the camera is all packed up so i cant really take pictures right now, i f you were wondering about the erc 6g servo here is the link, http://www.airtekhobbies.com/erc6.html

microflitedude Sat Feb 04, 2012 8:26 pm

mitchg95 wrote:my family and i are goin out of town for a week, the camera is all packed up so i cant really take pictures right now, i f you were wondering about the erc 6g servo here is the link, http://www.airtekhobbies.com/erc6.html

Those servos are designed for lightweight park fliers. I would not use them.

mitchg95 Sat Feb 04, 2012 9:28 pm

ok i will not use them, thx for the input

mitchg95 Mon Feb 13, 2012 10:26 am

well i filled the fuselage with spray foam as suggested on the 1st page of this tread, now i have to find the push rods and install the servos Smile

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