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The most recent discussions

Estes A8 engines thrust curve change?

February 2, 2021, 4:44 am

Does anyone know if Estes changed the thrust curve of the A8 engines? A tech doc from the 70's shows only a spike for boost. Today's website shows a spike followed by a flatter sustaining thrust... Read more »

Cesaroni motors

May 12, 2020, 5:05 pm

Hello, In the Pro75 6g series, 7455M2150-P and Pro75 6G 8429M2020-P. In the Pro75 3G series, 3727L1050-P and Pro75 3G 3683L851-P. we couldn't find detailed technical drawings of their engines and ... Read more »

Re: Rustoleum wrinkling on 2nd coat!?

April 24, 2020, 12:29 am

Airbrushing might be what's needed...with a Future or similar acrylic floor finish top coat. Read more »

Which HPR Motor Makers are Still in Business

April 21, 2020, 1:59 am

Hello the Group I have been gone from the hobby for about 14 years. Which of the Kosdon type motor manufacturers are still in business? Kosdon Motors died and Aerotech seems to be making reloads f... Read more »


April 14, 2020, 4:12 pm


DTH and Rotary Drill Rig Suppliers

February 23, 2019, 11:53 am

Looking for a company which supply Drill Rigs at affordable cost? Then here you go you are at exact place Focus Mining Services are suppliers of DTH & Rotary Drill Rigs in Both Australia & South ... Read more »

Re: Dr Shantanu Panigrahi - UK's Unsung Hero, Suing 800 Wicked People

February 8, 2019, 3:21 pm

Insanity is a wonderful thing. Yours Truly knows all about it. But you should get back on your meds. Insanely yours, Yours Truly Read more »

Reverse Circulation Bits | RC Bits Manufactured by Focus Mining Services

January 31, 2019, 9:44 am

Focus Mining Services supplies a range of Reverse Circulation Bits (RC bits ) which are designed for optimal performance. We supply RC bits which are s pecially designed for hard formation drilling... Read more »

Focus Mining Services- Wire Line Core Barrels

January 9, 2019, 11:39 am

In Australia & South Africa Focus Mining Services is a leading service prov ider of Mining Products & Wire Line Core Barrels. Various products used for Mining & Blasting are available at Focus Min... Read more »

Manufacturers & Suppliers of Mining Products in Australia & South A...

December 27, 2018, 11:59 am

Focus Mining Services is biggest Mining Services company in Australia & Sou th Africa. We manufacture & Supply all the mining products for Construction Area, Mining Area, & Industrial Areas. We su... Read more »

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The best rated discussions

Kevin Funk would be proud of this

rating: 5

If only he could see this... -Fred Shecter NAR 20117 Read more »

Smoke tracking.

rating: 5

I am looking for a smoke mixture that I can have the second stage Estes D engine light so I can track the final path of a rocket. It must be low flame so it wouldn't start a fire if the rocket crashe... Read more »

What does over stable do to a rocket

rating: 5

I just downloaded the demo version of Rocksim and all my designs are over stable by a caliber or two or three. What does this really mean. Read more »

Corporal scale data

rating: 5

Could anybody please point me in the direction of scale data of the US Army Corporal rocket? I've found a bunch of photos on the 'net, but I'm yet to find any scale data. Read more »

Balsa Machining Service - Commercial announcement

rating: 5

10/24/03 Please excuse this crass commercial announcement, but some may be interested in these new product additions. Balsa Machining Service has just added the following tubes and couplers to its pr... Read more »

Estes Sweet Vee

rating: 5

Has anyone on this group have experience with the Estes Sweet Vee? Comments, good or bad? Keith Read more »

[F-FT] Level 1 rocket

rating: 5
  [ 2 3 ]

What recommendations to folks have for a mid-power rocket that could also be used as a Level 1 certification rocket? Any pros/cons of your suggested model would be appreciated. Since NSL is near m... Read more »

Build a Homemade Laboratory Scale

rating: 5

Hi Folks: This post is to announce a new Teleflite publication in eBook format. It will teach you how to make a high precision laboratory scale with simple hobby tools and things you can buy at a h... Read more »

jerry irvine is a lying coward

rating: 5

jerry, did I get your attention? Good. I have a question for you. What was YOUR purpose and intent, when you labeled a 210 pound shipment of rocket motors, as model aircraft parts? Be specific. Read more »

Giant scale B-52--with 8 turbines!

rating: 5

Anybody see this giant scale B-52? Actually has 8 real turbines at about $1500 each! It has a wing span of about 22 feet, and weighs 330 lb fully fueled. Tak... Read more » is a website by engineers for engineers. It is not affiliated with any of manufacturers or vendors discussed here. All logos and trade names are the property of their respective owners.