Launch Lab Rocketry

[kuririn]

Placed an order on March 18, 2021.
Received it on March 20.
5014 miles in two days.
Big shout out to Steve at Launch Lab and to USPS.
Excellent service!

 

[hball55]

After reading your post, I went there and ordered a Bullet Bobby.

 

[DigBaddy]

Ordered a Bullet Bobby recently too. Arrived super-fast. Packed well, included a cool sticker, two pieces of candy and a coupon for 15% off the next order. A+

 

[hball55]

I contacted them regarding them possibly building and marketing an upscale version. I saw on the internet where someone built a larger version scratch, calling it Bullet Bill, which is based on the Nintendo Mario Brothers character. Probably why Launch Lab named theirs Bullet Bobby, but who knows, this guy might actually be Launch Lab. The very same decal scheme is used on Bullet Bill and it looks awesome. Anyway, here’s hoping Launch Lab takes the leap and does an upscale version.

My Bullet Bobby arrived yesterday and it’s built and primered as I type. I stole some modeling clay from another kit and added it to the nosecone, now there’s .90 oz. noseweight and it’s 1.03 overstable, but that’s without a motor. I have a Quest 18mm D20 I want to put in it, which leaves it at .74 stable, which is definitely acceptable in a short rocket. It sims to just over 900 ft.

 

[messedupryan]

Y'all are gonna talk me into one of these...

 

[Launch Lab Rocketry]

Y'all are gonna talk me into one of these...

12% off for the next 4 hours until the sale ends with code MADNESS lol. Thanks for the interest!

 

[Launch Lab Rocketry]

I contacted them regarding them possibly building and marketing an upscale version. I saw on the internet where someone built a larger version scratch, calling it Bullet Bill, which is based on the Nintendo Mario Brothers character. Probably why Launch Lab named theirs Bullet Bobby, but who knows, this guy might actually be Launch Lab. The very same decal scheme is used on Bullet Bill and it looks awesome. Anyway, here’s hoping Launch Lab takes the leap and does an upscale version.

My Bullet Bobby arrived yesterday and it’s built and primered as I type. I stole some modeling clay from another kit and added it to the nosecone, now there’s .90 oz. noseweight and it’s 1.03 overstable, but that’s without a motor. I have a Quest 18mm D20 I want to put in it, which leaves it at .74 stable, which is definitely acceptable in a short rocket. It sims to just over 900 ft.

Henry, please report back and let me know what happens. I have not tried the D20 in it, but you should not need to add the extra clay. .9oz seems like an awful lot. In the sim, did you add the phantom mass-less Nose Cone in the rear to help simulate proper stability margin? I have about an ounce of clay in my tester 24mm version, but those weigh a lot more than the 18mm Quests...

Curious to see if it's too overstable and does flips...

 

[hball55]

Henry, please report back and let me know what happens. I have not tried the D20 in it, but you should not need to add the extra clay. .9oz seems like an awful lot. In the sim, did you add the phantom mass-less Nose Cone in the rear to help simulate proper stability margin? I have about an ounce of clay in my tester 24mm version, but those weigh a lot more than the 18mm Quests...

Curious to see if it's too overstable and does flips...

You know, I didn’t. That’s the creation of a cone behind the rocket to accurately represent short rockets. I forgot the formula, but I do have a Rocksim of 2.6” V2. I’ll go back and review it.

When I mentioned the sim showing just over 900’ on that D20, I was wrong. It sims just over 600’. It’s the Aerotech D13 and D24 that sim over 900’.

 

[Cape Byron]

You know, I didn’t. That’s the creation of a cone behind the rocket to accurately represent short rockets. I forgot the formula,

Base drag simulation for short fat rockets.

Create a zero mass transition with:

- Zero diameter fore end.

- Length is diameter x π.

- Aft diameter is the same as the airframe.

Remember to delete it for your flight sims.

 

[hball55]

Base drag simulation for short fat rockets.

Create a zero mass transition with:

- Zero diameter fore end.

- Length is diameter x π.

- Aft diameter is the same as the airframe.

Remember to delete it for your flight sims.

thank you Skippy-2

I created two files last time I did it.

 

[Launch Lab Rocketry]

Base drag simulation for short fat rockets.

Create a zero mass transition with:

- Zero diameter fore end.

- Length is diameter x π.

- Aft diameter is the same as the airframe.

Remember to delete it for your flight sims.

Should wind up with something like this. Plenty stable with a C6-5 and only .25oz clay

 

[hball55]

Should wind up with something like this. Plenty stable with a C6-5 and only .25oz clay

View attachment 457868

I just created the transition and went with 0 noseweight and with an Aerotech D24, I show 1.45 I certainly won’t remove all of it . . . I will go back to what I originally had, .40

 

[Cape Byron]

thank you Skippy-2

I created two files last time I did it.

No dramas, my friend. I committed it to memory.

'Short and fat is where it's at.' - Bruce Lamington

 

[Launch Lab Rocketry]

Launch Lab Happy Hour tonight. 20% off 8-9pm EDT!