How many Gs do models pull. - RCCanada - Canada Radio Controlled Hobby Forum
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Old 06-21-2009, 08:58 PM   #1
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How many Gs do models pull.

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We were just sitting around BSing at the field yesterday and we go to questioning what kind of G force a model can pull in extreme manuvers. Anyone know for sure? We were thinking 12 to 15 or so

I keep having the same mechanical problem. I've got a loose nut on the transmitter!

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Old 06-21-2009, 09:35 PM   #2
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Re: How many Gs do models pull.

QUITE A lot brought 2 aircraft home the other day. They pulled a lot of GS from the wife. No seriously what a model does would kill a human pilot. So I would say that in some your pushing at least 20 GS.f4u
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Old 06-21-2009, 10:03 PM   #3
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Re: How many Gs do models pull.

I flew a friends Giant Scale Sweet and Low which is not aerobatic model. It was equipped with telemetry and it pulled almost 10gs from a 105 mph dive. I pulled it out slowly and was surprised at the g force.
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Old 06-23-2009, 05:59 AM   #4
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Re: How many Gs do models pull.

You can estimate it based on speed, radius and orientation:

Centripetal acceleration = velocity squared / radius of turn.

So, for example, if a model has a top speed in a dive of 100 km/hr (28 m/s)
and you pull out of the dive with a turn radius of 20 m,

Centripetal acceleration = 28^2/20 = 39.2 m/s/s

To convert to G forces, divide acceleration by 9.8 m/s/s (earths gravity)

G forces = 39.2/9.8 = 4 G's.

Be sure to add 1 G for the pull experienced at level flight (at the bottom of the turn).

So the total G forces is 5.

If you are at the top of the turn, you subtract 1 G, since earth is pulling towards the center of the turn. In that case, the total G forces would be 4-1 = 3.

Note that if you double the speed of the dive (maintaining the same loop radius) the G forces will increase by a factor of 4.

It's no wonder we get to see wings snap from time to time.
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Old 06-23-2009, 02:03 PM   #5
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Re: How many Gs do models pull.

I have recently gotten into electric pylon racers. The one that I got, an Escape, has the wing stressed to over 50g's! Check out this video of an Escape to see why:

Escape Video
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Old 06-24-2009, 11:56 AM   #6
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Re: How many Gs do models pull.

We purchased a telemetry system to measure G-Forces on a model airplane (as well as other items such as Altitude, Airspeed, RPM, etc).

As Bullwhip stated above, we were able to pull 9.87 positive Gs from the pullout of a steep dive from 2000 ft up travelling at an airspeed of about 104 MPH.

You can read more about this on our Thunder Hangar Blog.

Check out the Thunder Hangar Blog!!
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