Gorge Rocket Club Section 790

Mad Cow Nike Smoke
Daniel Peirce Blue Lava Rocket

Dan had a great Level 2 flight with his Blue Lava Rocket

Good luck to Team USA as the World Space Modeling Championship begins July 29th 2018 in Poland:


  • Dates for the GRC 790 2018 Season Wyeast Middle School Launch dates: Times for launch dates are from 9 am to 12 pm

August                                  18th         Saturday

September                         15th         Saturday

October                               20th         Saturday

November                          17th         Saturday

December                           8th           Saturday

Bring your rocket and your own engines.
There are two per month and will be at either three locations. Wyeast (which is a larger field and can accommodate larger engines and rockets),  Westside for A to C motors, or Parkdale.

If you know you are coming, it helps to RSVP via email so in case there is a last minute change due to weather or launch site change beyond our control, we can let you know. Otherwise, most launches are scheduled to go regardless of all but impossible launch weather. If it is windy, we suggest using smaller engines (A) and cutting a hole in the shoot or using streamer recovery.

Fees: If you would like to join, you can come to the shop or  launch and fill out a waiver and it is $15 per family or $10 per person for the whole season (bring cash or check or if you need to pay by credit card please go through HR Community Ed because 100% of the fees go to them to pay for launch site). A parent or guardian is expected to be present for children, these are not supervised launches.  https://hoodriver.cr3.rschooltoday.com/public/costoption/class_id/3557/public/1/sp/

StickerShock (http://stickershock23.com/ ) helped with designing the wrap for the rocket.

This rocket will look impressive on the pad and into the sky.

Since Spring is here, bigger flights will be forthcoming soon.

Daniel Peirce did a remarkable job with the Semroc Saturn 1B rocket
Check out the rocketry show at https://www.therocketryshow.com/
Check out the rocketry show at



Hercules up on a G75-4
Photo provided by Jim Reed
Photo provided by Jim Reed

"Congratulations to Daniel Peirce for Certifying Level 1"

Daniel successfully launched his Mad Cow Honest John rocket on an H128-10W with great results:

Welcome to the Gorge Rocket Club Section 790 website.

If you have any questions please feel free to contact me: Thompsonje@gmail.com

  My Background

What is Thrust to weight ratio?

To safely launch a rocket the thrust to weight ratio should be at least 5 to 1

For example, if a rocket weighs 0.4 kg, and the motor has a thrust of 15 Newtons, is this safe?

Answer: The weight of the rocket is 0.4 x 9.8 = 3.9 N. Thrust is 15 N. The thrust to weight ratio is thus 15:3.9, or 3.8:1. This is less than 5:1 so the launch would be unsafe.


NAR http://www.nar.org/



2016 Launch Dates (Click me)

Its a beautiful place for the hobby of rocketry
Its a beautiful place for the hobby of rocketry
Dans Snake Jumper Rocket

Rocket History Quiz:


For the answers, email me:-)

If you have any questions please feel free to contact me: Thompsonje@gmail.com

High Powered Organization for those interested is:



What is this thing called World Space Modeling Championships:

Intro to rocketry part 1:

intro to rocketry part 2:

intro to rocketry part 3:

Propellant Types:

igniter installation:

Interesting site called "The Orbital Mechanics"


Rocket Engineering and Science Technologies

Slide Rule Museum

1 Newton = 0.2248 pounds

1 Pound = 4.448 Newtons