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CG and main undercarriage


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#1 B52

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Posted 11 September 2017 - 09:00 AM

1.   In referring to below is the CG showing correct in a zero fuel weight status ?

2.   what is the distance of the main wheel axis to front or back ends of the aircraft ?

3.   Is prop axis tilted upwards in relation to the wings cord ?

 

 Cozy_CG.jpg



#2 TMann

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Posted 11 September 2017 - 09:27 AM

1.   In referring to below is the CG showing correct in a zero fuel weight status ?

2.   what is the distance of the main wheel axis to front or back ends of the aircraft ?

3.   Is prop axis tilted upwards in relation to the wings cord ?

 

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#3 B52

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Posted 13 September 2017 - 12:56 AM

 

3.   Is prop axis tilted upwards in relation to the wings cord ?

 

 Cozy_CG.jpg

 

 

Engine is tilted upwards about 2° because the prop axis is above the CG vector otherwise when applying power the aircraft would pitch downwards.  Is this correct ?

I wonder if they are any propeller aircraft where the engine tilt can be adjusted in mid flight.



#4 Andrew Anunson

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Posted 13 September 2017 - 04:07 PM

1.   In referring to below is the CG showing correct in a zero fuel weight status ?
2.   what is the distance of the main wheel axis to front or back ends of the aircraft ?
3.   Is prop axis tilted upwards in relation to the wings cord ?
 
 Cozy_CG.jpg


The CG changes depending on how you load the plane (fuel, people, baggage, ballast).
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#5 B52

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Posted 14 September 2017 - 01:34 AM

Engine is tilted upwards about 2° because the prop axis is above the CG vector otherwise when applying power the aircraft would pitch downwards.  Is this correct ?

I wonder if they are any propeller aircraft where the engine tilt can be adjusted in mid flight.

 

Pitch_down.jpg

 

 

In above DC9 the thrust vector is well above the CG but is downwards contrary to the Cozy pusher 2° upwards. One would think that it would cause the DC9 to pitch down when power is applied which is not the case.

 

Anybody care to elaborate ?   



#6 TMann

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Posted 14 September 2017 - 12:01 PM

>Anybody care to elaborate ?   

 

Sure. 

We are not (for the vast majority) Aerospace Engineers so we are pretty much dependent on the plans which have been flight tested.

Engine mounts that have been manufactured by the Cozy Girllls already have the plans criteria built in.

The typical power plant is either a single Lycoming or Continental with a sprinkling of other manufacturers.

 

The typical builder cannot afford the cost, overhead and efficiency associated with a jet/turbo prop much less a DC9.

 

While your question is pretty much hypothetical, who wants to reinvent a proven design?

There are plenty of other areas to focus your attention.

 

How about designing the landing gear so it will change direction allowing you to land in a crab like the B-52?


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#7 Voidhawk9

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Posted 14 September 2017 - 08:49 PM

How about designing the landing gear so it will change direction allowing you to land in a crab like the B-52?

I'm already visualizing a powered system that moves the gear hoop to accomplish that...  :lol:


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