Lakeroadster's Lifting Rocket

[neil_w]

Did we ever hear your plans for what's gonna go in the cargo pod?

 

[lakeroadster]

But remember also that the loss of thrust (and thus impulse) is merely according to the cosine of the cant angle. These look like - what? about 10°. That would mean only about 1.5% loss. At 20° you lose 6%. So it would take a tiny baby E to look like a D. (An Estes E12 would have to be canted about 43° to look like a D.)

You have a good eye Joe. They are canted 12 degrees ... just enough to give a warm toasty glow to the BT-60 main fuselage..

 

[lakeroadster]

Did we ever hear your plans for what's gonna go in the cargo pod?

On the first few flights a motor. But the motor mount is removable. Even with the motor mount though one of those small thumb drive looking altimeters would fit nicely. Or remove the motor mount and install a camera.

Any other idea's are welcome. Got a Guinea Pig I could borrow?

 

[jqavins]

With a load like a camers, consider these:

https://www.thrustcurve.org/motorsearch.jsp?id=782
https://www.thrustcurve.org/motorsearch.jsp?id=944​

 

[lakeroadster]

With a load like a camera, consider these:

https://www.thrustcurve.org/motorsearch.jsp?id=782
https://www.thrustcurve.org/motorsearch.jsp?id=944​

The F30 motors... wow, they are powerful... but expensive. About twice the price of the E-20's

They seem like a good choice as they don't seem to have enough kick to shred the rocket at ignition.

 

[BABAR]

Any other idea's are welcome. Got a Guinea Pig I could borrow?

Can't launch anything with a spine. Great opportunity for a political comment here, but I will avoid it in respect for the moderators!

 

[lakeroadster]

Can't launch anything with a spine. Great opportunity for a political comment here, but I will avoid it in respect for the moderators!

No worries.. it was meant as a joke. As a kid I had a small GI Joe that I placed in the one piece plastic payload / nose cone of a rocket. He was a snug fit. When I recovered it the tips of his black boots left skid marks from the bottom of the payload section up toward the top, where his head was jambed into the nose cone.

At least I think the black streaks were from his boots....

I guess I should have put a helmet on him.

 

[jqavins]

I guess I should have put a helmet on him.

And maybe a parachute?

 

[mbeels]

At least I think the black streaks were from his boots....

I guess I should have put a helmet on him.

And maybe a parachute?

I was going to suggest a diaper......

 

[BABAR]

I was going to suggest a diaper......

only if they make diapers in Camo patterns.

oops, they do!

https://www.amazon.com/My-Pool-Pal-...rds=camouflage+diapers&qid=1576710130&sr=8-12

 

[neil_w]

This rocket got some discussion at the very end of the latest episode of The Rocketry Podcast...

 

[kuririn]

Congratulations, John for the thumbs up on the Rocketry Show podcast.
I was aware of the podcast but not the FB discussion group.
Some interesting stuff there.

 

[lakeroadster]

This rocket got some discussion at the very end of the latest episode of The Rocketry Podcast...

Once again, thanks for the heads up Neil. I'll check it out.

If anybody is interested... go to 59:30 at this link ---> https://www.therocketryshow.com/84-...glIyHsjc7V9MGn7xjUOZFdunGmvoc6sikSkYkUWReLFhE

 

[Crawf56]

Did this rocket ever fly?

 

[lakeroadster]

Did this rocket ever fly?

Thanks for asking. Has not launched yet. It still needs the copper paint and I need to build the launch platform.

Or as the CD player indicates.... STAND BY..

Speaking of which... anybody know of a good place to buy micro aligator clips for the ignitors? The local hardware store has them but they are $5 a piece! I need (8) of them and there is no way I'm paying $40 for (8) little clips.

 

[mbeels]

Speaking of which... anybody know of a good place to buy micro aligator clips for the ignitors? The local hardware store has them but they are $5 a piece! I need (8) of them and there is no way I'm paying $40 for (8) little clips.

I had the same issue, and got around it by buying a package of test leads with alligator clips and cutting the wires in half. It was cheaper than buying the alligator clips individually, and they already have wires attached. I forget where I bought them, but they were cheap.

 

[John Kemker]

I had the same issue, and got around it by buying a package of test leads with alligator clips and cutting the wires in half. It was cheaper than buying the alligator clips individually, and they already have wires attached. I forget where I bought them, but they were cheap.

https://www.newark.com/search?st=micro alligator

Newark has a wide selection for decent prices. I'm sure you could find them from mouser.com as well.

 

[neil_w]

Click here for Digikey listing

Many cheap options.

 

[lakeroadster]

Thanks guys... you folks are awesome.

 

[John Kemker]

Thanks guys... you folks are awesome.

Aww, shucks! 'Tweren't nothin'!

I think I speak for Neil, as well, when I say we're happy to help where we can. I, for one, know that my rocketry accomplishments have been because I was helped by many, many people!

 

[lakeroadster]

Built a display stand today for the Lifting Rocket. still need to stain it.

 

[BABAR]

I admire your confidence. I would tend to make sure I got at least one successful flight out of a rocket before I built the display stand. More power to you. Hoping for a great flight.

 

[kuririn]

Even a shelf queen needs a display stand.
Likewise, best wishes for a successful maiden flight.

 

[jqavins]

Built a display stand today for the Lifting Rocket.View attachment 411626

Or just oil it and leave it light; it's lovely as is.

Looking forward to a flight report.

 

[lakeroadster]

Now that I have some flights under my belt as a BAR it's time to finish The Lifting Rocket.

I'm revising the (3) parachutes to a single 30" chute and plan to fly it without the cargo bay, on a cluster of (3) D12's. If that's a success, I'l try the cluster and a single motor at the bottom of the rocket. And then if that's successful, I'll add the cargo bay.

Well, that's the plan anyway.

@Daddyisabar, have you ever flown a tractor motor rocket that also had a motor at the bottom of the rocket, at the standard location?

 

[lakeroadster]

Curious, will three 18” chutes take up more space than a single corresponding larger chute? All my experience is in low power, when I have tried even two chute is usually find one inflates and the other streamers.

I finally listened to you @BABAR, it just took 4 years.

Now that my F-79 ate dirt and asphalt using (2) chutes one of which wouldn't billow... I'm on the "less is more" bandwagon.

 

[Daddyisabar]

Now that I have some flights under my belt as a BAR it's time to finish The Lifting Rocket.

I'm revising the (3) parachutes to a single 30" chute and plan to fly it without the cargo bay, on a cluster of (3) D12's. If that's a success, I'l try the cluster and a single motor at the bottom of the rocket. And then if that's successful, I'll add the cargo bay.

Well, that's the plan anyway.

@Daddyisabar, have you ever flown a tractor motor rocket that also had a motor at the bottom of the rocket, at the standard location?

View attachment 529858View attachment 529859

Fly a rocket with the motor on the bottom WHERE IT SHOULD BE...poppycock! The answer to your question is kinda. The 8 motor Avro Lancaster had 2 lower midcant 18mm motors. Same with Dick Stafford's Ekranoplan. He had a build thread on The Rocket Dungeon if that site is still around.

I will get on the old home tower computer and see if I have pictures from more civilized times.

Your motor at the traditional bottom center line is fine. If it doesn't ignite you should be ok, just a huge loss of cargo carrying capacity, dead weight. The potential loss of efficiency would strike at the heart of my inner rocket scientist.

Multiple chutes can get tangled and loose efficiency on the way down, making for a not so authentically pleasing descent. The parachute duration champion RSO might shake his head, but at least it is something slowing the descent. AND as an oddroc scumbag your standards are very low. AND then there are times the Multiple chutes don't tangle and it looks like freaking NASA on the way down.

Below is the 8 parachute 58 Hustler which tangled a bit but overall the Po Boy dual deploy was good. The height of poor model rocket design, desperate for recovery room and chute deployment at high altitude. You know the type.

 

[jqavins]

Gosh Dangit! how I wish we could get Klima engines over here. That four engine configuration would look awesome with their B2 (2.5 sec burn) or C2 (5 sec burn) in the center.

 

[lakeroadster]

Spent some quality time with my old friend TLR today.

I masked the fins and cluster, and then painted the body tube Rustoleum Hammered Copper. Then I used Spar Urethane on strut rods.

Also updated the Open Rocket simulation by revising the cluster motors to pods.

I remember a number of times when @neil_w counselled me that the sim using internal tubes for external items would not be accurate.​

​

The apogee of The Lifting Rocket model previously, without pods as the cluster, was 1085 ft. The apogee using pods is about 583 ft.​

​

583 ft seems much more realistic.​

A tip of the hat to @neil_w ​

 

[lakeroadster]

Installing the lower launch lug.

• First I sanded the spar urethane off the fin at the location of the launch lug.
• The photo's show the alignment fixturing I used to ensure the upper and lower lugs are in alignment with each other. I periodically spun the wooden dowel to make sure it didn't happen to be trying to glue itself to the lug.