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Arrows T28

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John Tee02/12/2019 23:08:28
799 forum posts
65 photos

Has anyone had/flown one of these models? Nearly finished installing the radio and setting up the throws etc. My main query is the CG position. In the instruction leaflet it suggests 45 - 50 mm from what looks like the front of the wing moulding which is not far behind the leading edge of the wing, and obviously is very tail heavy. There is a fillet from this moulding edge back to the wing which is from memory approx 20 mm. The root chord of the wing is 210mm. I have balance at approx 25% which seems right and puts the CG about 0.5 inches in front of the undercarriage main wheels (trike undercarriage) .

Any info would be welcome. Thanks in advance.

Sorry about the mix of imperial / metirc measurements.

JOhn

Edited By John Tee on 02/12/2019 23:09:19

Edited By John Tee on 02/12/2019 23:10:49

Denis Watkins03/12/2019 08:17:51
3937 forum posts
64 photos

Have not got the Arrows T28 John

But have flown this size and larger.

In general, the T28 is an ideal flyer in model form

C of G on a trike is always in front of the main wheels in order to rotate at take off too

Just in front of the main wheels looks a good start point then adjust after further flights

This livery is spectacular

Colin Carpenter03/12/2019 08:31:08
577 forum posts
35 photos

R C Groups I’m sure have a thread on this plane ! Colin

John Tee03/12/2019 14:35:04
799 forum posts
65 photos

Thanks for the replies, been out all morning so not seen them. Looks like I was close with my estimate. Seem to have lost the program I had for CG calculations and the one I found on line was a bit too complicated.

I will have a look on RC Groups site to see what others think.

John

John Tee03/12/2019 14:35:26
799 forum posts
65 photos

deleted due to double post

 

 

Edited By John Tee on 03/12/2019 14:35:56

Colin Carpenter03/12/2019 15:27:28
577 forum posts
35 photos

John ! I've got the Bearcat and that needs lead right up front . It flies beautifully like that but take off and landings need short ,dry grass ! With flaps deployed it descends like an elevator , but always tip stalls a foot from the ground ! I roll it on flapless. Colin

John Tee03/12/2019 15:55:30
799 forum posts
65 photos

Colin, Thre problem with the T28 is there is no room in the battery bay without surgery to put any ballast. On my Hellcat the cowl is held on with magnets and I got my ballast inside the cowl, but the T28 appears to be glued on. I haven't really tried to remove it yet but won't force it.

The video on RCgroups seem to show it flying very nicely, so looking for some decent weather to fly it. Access to our strip is difficult when wet and it is a fair walk with all the bits if we have to park elsewhere (3 fields off the road).

John

John Tee03/12/2019 15:56:32
799 forum posts
65 photos

another double post, sorry,

 

Edited By John Tee on 03/12/2019 15:58:02

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