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Old Jan 19, 2013, 09:54 PM
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DLE 20cc questions

First time with a gas engine.

How much fuel does the 20cc gulp per minute. I'm thinking of going with an 8 oz tank.

How much battery will a 20cc engine ignition use for a 10 minute flight?
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Old Jan 20, 2013, 05:30 AM
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An 8 ounce tank would be fine. I mostly use 10 ounce tanks on my 20 cc engines but seldom fly over 10 minutes and never run out of fuel. I have tracked battery usage on ignitions and consistently come up with a 10 ma per minute draw. 10 minute flight would equal 100 ma used.

Best regards.
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Old Jan 20, 2013, 05:58 AM
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One problem wiyh 8oz than is getting clunk line to flex enough ,Tygon is to stiff.
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Old Jan 20, 2013, 07:37 AM
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Thanks. I wish these came in a 10oz or 12oz tank.

http://www.aero-works.net/store/detail.aspx?ID=488


Guess i could buy a 16oz tank and just not fill it all the way. What i'm trying to avoid is the massive CG change as fuel burns off.

In your Gas planes, where are you mounting the tank?
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Old Jan 20, 2013, 10:19 PM
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Originally Posted by Lifer View Post
An 8 ounce tank would be fine. I mostly use 10 ounce tanks on my 20 cc engines but seldom fly over 10 minutes and never run out of fuel. I have tracked battery usage on ignitions and consistently come up with a 10 ma per minute draw. 10 minute flight would equal 100 ma used.

Best regards.
Caution _ _ _

ma (miliamperes) is not a quantity of elctricity.
You cannot take the intensity 10 ma per minuite and claim 100 ma after 10 minutes. The 100 ma is a rate of flow, not a quantity.

I figure you mean that if 10 mAh (mili-Amp-hour) which is a quantity has been used in the first minute then 100 mAh would have been used after 10 minutes.

A quantity of electricity is a rate of flow over a time period.
Similar to if one gallon of water per minute come out of a pipe then after 10 minutes 10 gallons have come out.

The ma is a rate of flow.
The unit for a quantity of electricity is the "coulomb".
One coulomb of elctricity is the quantity that passes a point at a rate of 1,000 ma ( which is one ampere) for a duration of one second.

Zor
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Old Jan 21, 2013, 05:37 AM
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I don't know what your point is, but my point was to share my experience with another modeler. I charted battery usage for about 2 years and came up with the 10ma per minute rate. If you have something to share, then share it. If you just want to argue with everybody, join Congress.
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Old Jan 21, 2013, 08:46 AM
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You may want to look at these clunkless tanks too?
http://www.jlproducts.net/ProductRotoFlow.html
I have not used mine yet but I like what I read.

P.S.
Join Congress. That's good!
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Old Jan 21, 2013, 11:15 AM
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Originally Posted by tower flyer View Post
One problem wiyh 8oz than is getting clunk line to flex enough ,Tygon is to stiff.
Use Viton instead - it's much more flexible and doesn't need to be replaced nearly as often.
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Old Jan 21, 2013, 04:28 PM
Zor
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Originally Posted by Lifer View Post
I don't know what your point is, but my point was to share my experience with another modeler. I charted battery usage for about 2 years and came up with the 10ma per minute rate. If you have something to share, then share it. If you just want to argue with everybody, join Congress.
I simply shared some of my knowledge of electricity with you.
You obviously do not appreciate that.

Zor
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Old Jan 21, 2013, 04:44 PM
Zor
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Originally Posted by scootrb4 View Post
You may want to look at these clunkless tanks too?
http://www.jlproducts.net/ProductRotoFlow.html
I have not used mine yet but I like what I read.

P.S.
Join Congress. That's good!
Looking at the link it is evident that someone did some thinking

Wishing you realize what you consider "good" if you are not yet a "congress person".

Zor
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Old Jan 21, 2013, 11:47 PM
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I simply shared some of my knowledge of electricity with you.
You obviously do not appreciate that.

Zor
600mAh, there I share my math with you. Go forth a do good things.
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Old Jan 21, 2013, 11:52 PM
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Looking at the link it is evident that someone did some thinking

Wishing you realize what you consider "good" if you are not yet a "congress person".

Zor
What happens when the plane is pointed up or down for extended periods?
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Old Jan 21, 2013, 11:54 PM
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Originally Posted by ryanbe15 View Post


Guess i could buy a 16oz tank and just not fill it all the way. What i'm trying to avoid is the massive CG change as fuel burns off.

In your Gas planes, where are you mounting the tank?
Center the tank on the cg, you will barely notice any change in flight.
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Old Jan 22, 2013, 09:35 AM
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What happens when the plane is pointed up or down for extended periods?
It goes out of sight or it hits the earth

Seriously though. That's a good question, even if the pick up does slide forward it's rigid rear facing position would not allow pickup of some of the fuel in a vertical dive... I have one under the bench, not yet tested.
Comparatively, even a conventional clunk is not reaching the front of the tank so there should be no difference in fuel availability with regards to tank position.
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Old Jan 22, 2013, 10:30 AM
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It goes out of sight or it hits the earth

Seriously though. That's a good question, even if the pick up does slide forward it's rigid rear facing position would not allow pickup of some of the fuel in a vertical dive... I have one under the bench, not yet tested.
Comparatively, even a conventional clunk is not reaching the front of the tank so there should be no difference in fuel availability with regards to tank position.
I wonder if you can put a tube and clunk on the brass pivot pickup do hickey thing, maybe you have to shorten the brass a bit?

I have been running a 16oz tank with the dle20 and get over 20 minutes of flight, but I think the last 5 minutes sucks a bit of air.
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