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Hawker Hart 72" span model designer identity and c of g?

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martin collins 109/07/2020 11:45:43
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461 forum posts
207 photos

I bought this about a year ago and have just got round to pulling all the old Skyleader rx and servos out of it to put modern 2.4 stuff in. It has a 2 stroke i.c in it which is coming out to be replaced by an electric set up. The airframe is very light for it`s size and should make a nice flying model, my question is c of g, i have measured where it is on the current set up as it has obviously flown as is so that is my starting point but i have looked at the Gordon Whitehead 72" version and it is much further forward on that. This model is not built from that plan, the tailplane construction is much lighter on this and has no sheeting in the centre of it. I see on Sarik`s website that David Smith did a 73" one and it is on the X List plans list, the plan is nearly £30 so i don`t wish to purchase it unless i know my model IS built from that plan but i would be very interested to know where the c of g is on that. Can anyone help in any way c of g wise? Many thanks for any help given. h hawk 4.jpg img_20200709_111334_resized_20200709_111356267.jpg

Edited By martin collins 1 on 09/07/2020 11:47:14

Stumps09/07/2020 11:55:43
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53 forum posts

Could it be from the Hawker Hind plan that Sarik do ~ RSK1707?

martin collins 109/07/2020 12:00:02
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461 forum posts
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How did i miss that!!, Might well be but know way of finding out unless i get a look at the plan.........

However, i think this must be much lighter built, i haven`t removed the engine yet but i would say it looks around a .60 two stroke size.

Edited By martin collins 1 on 09/07/2020 12:01:46

Eric Robson09/07/2020 12:14:56
383 forum posts
83 photos

Just a thought, it does not matter how heavy or how light the model is the c of g should be in the same place. Unless the wing positions are not the same on one model as the ones on the plan you have.

Eric r.

martin collins 109/07/2020 12:22:06
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461 forum posts
207 photos

I agree Eric but this has obviously been flown a lot and on this engine as the holes are only large enough to fit this size. The cord of the wing is 11.5" and the two points are 1.5" apart, not a small margin...........

charlie holdford29/09/2020 16:47:07
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74 forum posts
209 photos

Hi Martin

The Sarik plan RC 1538 73" plan also has a 1/16th central sheet in the tail plane and rudder. But as its a plan the builder can do what they like! The Main wing cord is just under 12"

The c of g is marked as exactly halfway between the cabane struts of the top wing

As an aside the plan also shows it as a two seat bomber not the trainer as you have.

Good luck

Robin Colbourne29/09/2020 18:59:14
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699 forum posts
17 photos

There is always the possibility if built from a plan that the builder redesigned the tail with a much lighter structure, if he was planning to put a lighter engine in from the start.

Its a very nice looking model anyway!

The full size Hart on which its modelled has an interesting history! Hawker Hart K4972 Timeline

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