Scratch Mach 10+ Original Design / Scratch Built

Scratch - Mach 10+ {Scratch}

Contributed by Bob Hvarven

Manufacturer: Scratch
(Contributed - by Bob Hvarven)

Rocket PicBrief:
An Approx. 2X upscale of the Centuri MACH 10 (Mig 15 Jet looking) Boost Glider made around 1972. Recovery is glide with jettisoned nose cone using streamer or small parachute.

Construction:
This rocket is easy to build and should be no problem to anyone who has scratch built before. There are no items that need special attention as construction is straight forward with no surprises. Wing and vertical fin alignment is best accomplished using a centering line drawn on main tube. This is a very sturdy model and by experience can take a lot of abuse. No special tools are needed. Supplies came from scrap balsa and tubes and nose cones I already had on hand. Painted it Bright Metallic Silver, and added Red Monocote stars to add to the Korean War Mig 15 look. Filled balsa with Model Sanding Sealer Dope.

Rocket PicFlight:
The original MACH 10 used 18mm "C" motors and I used 24mm "D" motor for the upscale (D12-0 or D12-3 works fine). Small tube with nose cone needs wadding as usual to protect streamer/parachute. Motor retention is a standard Estes clip. The model flew very straight off the rod and during climb. At burnout, the nose cone ejected and the glide started. The glide is fast as it is with the small MACH 10, although the upscale seems to have a little more stability; probably due to the larger wing and tail surface area. The model came in very steep in a tight left turn on first flight. The landing was a "Lawn-Dart" type. Although it stuck in the ground there was no discernible damage. The model can take a good lick and come back for more.

Summary:
I really like this rocket; it is great looking and is a departure from the norm and nostalgic. Pros: Fun to build, nostalgic, good looking, different, tough, and a real attention getter. Cons: Takes some patience getting it trimmed and the glide is a bit fast.

Rocket PicOther:
I replaced the "Fixed" elevator system with an active one due to experience with the small MACH 10. I made an elastic operated elevator that goes to a neutral position during takeoff, and deploys to the up position at motor burnout. This makes for a more desirable launch and climb out. Works very well by the way.

Other Reviews
  • Scratch Mach 10+ By Bill Eichelberger

    B rief: I began building upscale versions of classic kits more out of necessity than for a desire for bigger rockets. I found early on that while a lot of the nose cones for the old kits that I wanted to recreate were no longer available in the 1:1 size, they were occasionally available in larger sizes. (They weren't always exact replicas, but close enough for me.) The Estes Rogue and Satellite ...

Flights

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