Christopher D. Shramko's Page

Location: Groveland, MA

Club Memberships: NAR #101549,CMASS Section 464,MMMS Club Section 727

Favorite Rockets: Der Big Red Max

Biography:

Rocketeer since 1981.

Club Home Page: http://www.cmass.org/

RocketReviews.com Pages:

• Rocket Gallery

2018-06-19

Javelin 4.6x - Javelin 4.6x and 1981 Super Flea

Build Entry

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2017-10-11

Javelin 4.6x - Preliminary Planning

Build Entry

I’ve decided on mid-body separation for ease of transport, on both launch lugs and rail buttons, and on upgraded recovery gear. Component View:   Painted View: Flight Simulations with L1 attempt engine selection highlighted:   Flight Simulations with First ... [More]

2017-10-10

Javelin 4.6x - Background

Build Entry

My first model rocket was the Estes Der Big Red Max . My second was the Estes Mini-Brute Javelin and Super Flea Combo . Mirroring that history, I'd originally intended to build a Mega Der Big Red Max for my Level 1 project and a Javelin upscale for my Level 2, but missed the MDRM sales wave. I ... [More]

2017-10-08

Javelin 4.6x

Build

My Level 1 project is a 4.6x upscale of the Estes Javelin  with an  Estes Partizon kit as the base. [More]

Mega Daddy 29 - Part II

Build

Kit-bash of Estes Big Daddy, Aerotech Initiator packing tube, and Aerotech 29mm Motor Mount.  Inspired by the  3D Mega Daddy , my son prepared a RockSim design with separation at the Big Daddy "Fin Can" to Aerotech Initiator shipping tube "Main Body Tube". We've ordered way too ... [More]

Mega Daddy 29 - Part II - First Launch: The Rocket Dreamed It Was a Skipping-Stone

Build Entry

First launch was scheduled for the CMASS joint launch with MMMSC in May at the Tuckahoe Turf Farm in Berwick ME.   Here are the updated simulations, with mass of components adjusted to measurements of actual components taken during the build, and with 10 MPH winds.   ... [More]

2016-07-12

Mega Daddy 29 - Paint Scheme Test

Build Entry

Here's the assembled rocket with a whole can (4 coats) of the neon-est green paint we could find. As we're happy with the results, thick-build primer, sanding, and more coats of neon green will follow. [More]

Mega Daddy 29 - Fin Installation

Build Entry

Paper skinning the fins. Three external edges then coated with thin CYA glue. Shortening the fin tabs. Post-shortening dry fit. Fins installed with epoxy on internal and external fin roots. Upright drying time. Many builds-in-progress in the background. After drying, ... [More]

Mega Daddy 29 - Electronics Bay

Build Entry

Our electronics bay will initially have only a lower bulkhead, fixed to the bay tube with epoxy fillets. This bulkhead will have two screw eyes to accept the upper and lower shock cords. We are installing a just-long-enough-to-reach length of shock cord between the e-bay and the nose cone to ... [More]

Mega Daddy 29 - Open Rocket Design Revision 1

Build Entry

[More]

Mega Daddy 29 - Body Tube

Build Entry

Nathaniel really can't wait to get his L1 certification and to start using electronics bays with dual-deployment. He realizes that he is too young for L1, but would like his rocket to "be ready" for when he is old enough. He is also concerned that we've added too large a volume to the rocket body ... [More]

2016-07-11

Mega Daddy 29 - Motor Mount Assembly

Build Entry

Installation of middle centering ring and cooling mesh to motor mount tube, and top centering ring to tube coupler. Tube coupler dry-fit on motor mount tube. Motor mount and tube-coupler dry-fit into fin can. Shortening tube coupler to twice the exposed length to save we ... [More]

Mega Daddy 29 - Dry-Fit of Fin Can and E-Bay

Build Entry

We dry fit different combinations of parts to find which sized of centering rings, bulkheads, etc., were required, and to see how much material we would need to remove from the through-the-wall fin roots.   [More]

2016-05-23

Mega Daddy 29 - Bits & Pieces

Build Entry

Parts from the Estes Big Daddy kit surrounding the Aerotech Motor Mount kit. The Estes parts on the left were added to our spare parts bin. The parts on the right were used for this build (Body tube, nose cone, and fins). So many options for our launch guide: heavy duty 1/4" launch ... [More]

2016-05-19

Mega Daddy 29 - OpenRocket Proof of Concept

Build Entry

Our build blog entries are lagging behind our work, which is lagging behind our schedule, but we are catching up! Here is our quick OpenRocket Proof of Concept Study to show that the basic design is feasible. [More]

2016-01-18

Mega Daddy 29

Build

Kit-bash of Estes Big Daddy, Aerotech Initiator packing tube, and Aerotech 29mm Motor Mount.  Inspired by the 3D Mega Daddy , my son prepared a RockSim design with separation at the Big Daddy "Fin Can" to Aerotech Initiator shipping tube "Main Body Tube". We've ordered way too many ... [More]