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Jan 10, 2020, 05:52 AM
flyin' fool
goldguy's Avatar
How about the specs on the 18" Dave. Need a comparison.

Thanks: Frank
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Jan 10, 2020, 10:28 AM
pull up -- PULL UP!!!
Since you moved the CG back would your 18 no longer need the nose extension?

And I'm sure this is obvious, but it's early still...U/C = ?
Jan 10, 2020, 11:19 AM
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r/cdawg's Avatar
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Nicely done Dave. The 18" looks to fly just like my version.
Jan 10, 2020, 11:33 AM
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Quote:
Originally Posted by hard line
....And I'm sure this is obvious, but it's early still...U/C = ?
Undercarriage or landing gear.
Jan 10, 2020, 12:01 PM
pull up -- PULL UP!!!
Oh, you mean LG. I think of U/C as undercamber and was picturing a potato chip wing. Which I think has been done on roundy's.
Jan 11, 2020, 01:21 AM
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Quote:
Originally Posted by hard line
Since you moved the CG back would your 18 no longer need the nose extension?
And I'm sure this is obvious, but it's early still...U/C = ?
Very likely..
But the extension was easy to add, and does not affect the flight..
Now without any lipo on board the model is balanced exactly at a 25% COG on the circle....

The lipo can be positioned on the COG, or moved back and forward to suit , basically any reasonable size can be used, I used a 450-500 2s
The U/C or L/G is a simple "X"made from CF rods lashed together with an axle and wheels

specs... 18 dia circle..racerstar 2304-1850.. 8x4.3 sf prop.. tgy1440a servos.. 12A ESC .. mini orange 4ch RX.. 7-8mm EPP..
weight with wheels 149g.... wing loading with a 450 2s =3.48ozsqft... sorry about the mixed numbers..oz and g...

I do recommend the racerstar motor and TGY servos... with gartt 2204-1800 motors being a good alternative
Last edited by davereap; Jan 11, 2020 at 01:49 AM.
Jan 11, 2020, 01:56 AM
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Next week the testing continues using an 18" fat bodied disco vs a 19.5" fat bodied quasar v3..
NOTE...The v3 's curved wing was cut back to make a v2 straight edged wing, this cut back has made it an 18.5". so there is less difference..
I swapped the sunnysky for a new racerstar.. So now they both have the same motor/prop setups..
Remaining.....still obvious differences the two. the fat bodies shapes, and the wing shapes..
Last edited by davereap; Jan 14, 2020 at 04:41 AM.
Jan 11, 2020, 12:08 PM
pull up -- PULL UP!!!
The reason I asked about the nose extension is I'm hoping to buy a foam kit from WMPF since I have no local access to decent foam...not even fff. I assume that kit probably won't have an extended nose.
Jan 12, 2020, 09:53 AM
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No the kit will be cut without any extension to the originals standard shape..

When I added an extension I had to extend the body as well to get a good fit..


r/cdawg...
?? have you made the drawings for your fuz yet??
Last edited by davereap; Jan 13, 2020 at 10:09 PM.
Jan 17, 2020, 03:11 AM
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Yesterdays session was a bit of a disaster.. crash damages and an ESC playing up prevented me getting a good comparison..
Both sets of landing gear were ripped off as I hit the roof beams..

The damages were a result of not using my standard L/G build methods.. normally I would fit 3 full triangles going up the fuz and onto the wing.. fitting the legs to these triangles. on the disco I tried a shorter set and so lost the lot..
On the quasar I had tried an alternative fitting.. again this proved to be too weak..

while they flew they both went well..
Disco repairs done, the disco repaired has a stronger landing gear..pic3 and and both have a new ESC ...
edit...The quasar is now done , similar to the disco pic4
AUW ....disco 186g ..quasar 190g.. includes the 450 2s lipo.
Wing loading ...disco 3.7ozsqft..... quasar 3.6ozsqft.
Last edited by davereap; Jan 17, 2020 at 05:43 PM.


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