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Cox Engine of The Month
Southridge CNC Hyper Viper
Page 1 of 1
Southridge CNC Hyper Viper
I bought one of these kits shortly after they were announced, but just recently got a "round-tuit".
It's done now, so I thought I would share some impressions of the kit and pics. Don't have any in-progress pics, as I didn't plan far enough ahead to take any.
The most unusual feature of the kit is the CNC carved fuselage, which comes in a top & bottom half that just need a final sanding and glued together. Mine was cut from some very nice, light wood. The ribs, and all other shaped parts are also machine cut. The ribs each have two 1/4" square holes that the spars slide into, and function as a wing jig. This was the only area that gave me trouble. The spars were a tight fit in the holes, and fumble-fingered me managed to split 4 of the ribs trying to slide them on. After that, it went together smoothly.
I made the gear removable, since I fly over grass. I also cut the cowl into a front and rear part. The front comes off for engine access. The rear part is glued on over the tank. The tank can still be removed by sliding it out to the front. This strengthens the front of the fuse, which IMO, has a weak point at the rear of the tank bay.
I installed the Tee Dee that Fredvon4 sent me, and a homemade 3/4 oz.tank. Covered it with monokote, in a scheme similar to the Cox one, but with better colors.It actually came out lighter than expected, at 8.7 oz. ready to fly.



It's done now, so I thought I would share some impressions of the kit and pics. Don't have any in-progress pics, as I didn't plan far enough ahead to take any.
The most unusual feature of the kit is the CNC carved fuselage, which comes in a top & bottom half that just need a final sanding and glued together. Mine was cut from some very nice, light wood. The ribs, and all other shaped parts are also machine cut. The ribs each have two 1/4" square holes that the spars slide into, and function as a wing jig. This was the only area that gave me trouble. The spars were a tight fit in the holes, and fumble-fingered me managed to split 4 of the ribs trying to slide them on. After that, it went together smoothly.
I made the gear removable, since I fly over grass. I also cut the cowl into a front and rear part. The front comes off for engine access. The rear part is glued on over the tank. The tank can still be removed by sliding it out to the front. This strengthens the front of the fuse, which IMO, has a weak point at the rear of the tank bay.
I installed the Tee Dee that Fredvon4 sent me, and a homemade 3/4 oz.tank. Covered it with monokote, in a scheme similar to the Cox one, but with better colors.It actually came out lighter than expected, at 8.7 oz. ready to fly.



duaneh- Bronze Member
- Posts : 59
Join date : 2019-04-06
Re: Southridge CNC Hyper Viper
Looks really nice. I hope it flies just as well.
Oldenginerod- Top Poster
- Posts : 3313
Join date : 2012-06-15
Age : 58
Location : Drouin, Victoria
Re: Southridge CNC Hyper Viper
Looks the business, how well did it balance out? The proportions are that of the original so I was wondering. The TD being light might make up the difference.
What does the homemade tank look like?
Ron
What does the homemade tank look like?
Ron
Cribbs74- Moderator
Posts : 11468
Join date : 2011-10-24
Age : 47
Location : Tuttle, OK
Re: Southridge CNC Hyper Viper
You did a very nice job on this plane.It looks fast just sitting there!
David S- Gold Member
- Posts : 176
Join date : 2015-06-23
Age : 61
Location : New Jersey
Re: Southridge CNC Hyper Viper
That is a very nice looking model. You did it great!
Marleysky- Diamond Member
Posts : 2926
Join date : 2014-09-28
Age : 68
Location : Grand Rapids, MI
Re: Southridge CNC Hyper Viper
The model looks terrific, best of luck with it. I love the color scheme. Ken
Ken Cook- Top Poster
- Posts : 4300
Join date : 2012-03-27
Location : pennsylvania
Re: Southridge CNC Hyper Viper
Really nice work with that Monokote. That's a tough one to do, let alone do well and it looks excellent.
Dave P.- Gold Member
Posts : 477
Join date : 2017-07-31
Age : 63
Location : Durham, NC
Re: Southridge CNC Hyper Viper
You did a great job on the plane. As others stated, also a great job on the covering as well. Looks like it is ready to take to the skies!
NEW222- Top Poster
- Posts : 3219
Join date : 2011-08-13
Age : 42
Location : oakbank, mb
Re: Southridge CNC Hyper Viper
I wish I had the patience to produce a finish like this one, I hope it flies as well as it looks.
ian1954- Diamond Member
- Posts : 2682
Join date : 2011-11-16
Age : 66
Location : England
Re: Southridge CNC Hyper Viper
@ian1954 wrote:I wish I had the patience to produce a finish like this one, I hope it flies as well as it looks.
G'day Ian. Nice to see you pop back in every once in a while.
Rod.
Oldenginerod- Top Poster
- Posts : 3313
Join date : 2012-06-15
Age : 58
Location : Drouin, Victoria
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