High Powered Flis Praetor? Will the fins stay on?

I can't wait to see her fly!

A note on ejection testing, why not just run some wire out of the vent holes attached to the e-match and connect it to a battery when you want to set it off? This is how I have tested charges at least. No fussing with a vacuum.

I used the vacuum for the main chute just to make sure the altimeter worked. I ran a wire out of vent hole to test the drogue charge.

The Loki 480 case has arrived along with an I210 and I405 motor. LOC 38/54 motor adapter fitted with old Loki retainer.

No Hazmat on the Loki motors! Love it!

Nice! Now let's see 'er fly! I'm betting on fully successful flights on BOTH (Especially the I405) motors. And make sure we get video of those sweet fins in action. Btw, what speeds are you expecting? Just yesterday I shot this with one of my balky U8 cameras in an attempt to get "good data" of experimental recovery system in action. Pointed it "up" to hopefully gain insight, turns out my second chute release setup did actually work but it failed to open. Had it looped directly to the n.c. to keep it out of the path of the main..

Wallace said:

Btw, what speeds are you expecting?

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For simulation I used both RocSim and Thrustcurve.org. This is a non conventional design....those fins will have a lot of drag. I’ve got 3 motors in my box that will work well with it...I think...

CTI I236 Thrustcurve.org says 330 ft/sec, RocSim 358 ft/sec
Loki I210. 349 , 393
Loki I405. 407 , 443

It’s got a space on the rocket wall now. Tulsa launch is Aug 11.

OKTurbo said:

For simulation I used both RocSim and Thrustcurve.org. This is a non conventional design....those fins will have a lot of drag. I’ve got 3 motors in my box that will work well with it...I think...

CTI I236 Thrustcurve.org says 330 ft/sec, RocSim 358 ft/sec
Loki I210. 349 , 393
Loki I405. 407 , 443

It’s got a space on the rocket wall now. Tulsa launch is Aug 11.

View attachment 389589

Click to expand...

Nice rocket wall. I need to make a proper hanger for mine.
Which motor are you gonna do? I can't wait to see how she flies and how confident you are in the construction

I think I'll go with the Loki I210 for the first flight. Sims to about 1700 feet with a good punch off the pad. The I405 will hit it like a hammer...big acceleration...not sure if I'm THAT confident yet.

We are thumbs up...GO for launch tomorrow with Tulsa Rocketry.

I’m in the shop gathering things up and prepping the motors. Loki I210 for the Praetor....CTI I195 for the Horizon. First time prepping a CTI....what a piece of cake! Couldn’t be easier....next time may just do it at the field.

It’s a morning launch and I have to get back for the 1:30 service at church. My 22yr old daughter is bringing the boyfriend for the first time. Can’t miss it! Just bringing 4 rockets, but first up will be the Praetor. I’ll get some GoPro video. Fingers crossed.

Love cesaroni's quick assembly. I use them 24-54mm

I've begun thinking of trying to build rockets that can use their entire delay length, so I don't even have to drill

Best of luck!! (With the flight AND the boyfriend...) Can't wait for the video.

It flies! The motor chuffed a couple of times before coming up to pressure, but everything else went perfect.

Let's see if an old GenX'er can load a YouTube video. It was brutally hot and humid at the field, and I didn't have much time before I had to head back home. The only flight for me was the Praetor, but it went perfect.

Congrats, great flight!

Picture perfect!

Absolutely does not get better than that! Congratulations!

Ph4ntastic! Any idea how high/fast or went?

Don’t know how fast. RRC2 is pretty simple. It beeped out 1389ft for altitude. Less than I predicted, but the motor chuff may have caused some loss.

It flew great. Next up will probably be an I377.

A few still pics I took with the GoPro. I had it on the crazy, wide angle, fish eye...sorry. We're very blessed to have such a beautiful site to fly at in Tulsa.

Can I borrow that field sometime? Not sure what it would cost to ship to New Jersey....

Perfect flight, and that whistle was a nice surprise.

C'mon, you know you want to tape a camera on the side and see those fins in action!

Superb!
Congrats on a great build and great flight.

As the current owner of Flis, love to see the upscale. Hopefully I can see it in person one day. Nice job!

Got back from LDRS last night. Little over a 3 hr drive from my house in Oklahoma....so glad we went. The wife was wanting to get out of town anyway. Only flew 2 rockets. Both the big Praetor and my mid powered one. With the clouds Sunday morning there wasn’t much of a ceiling to fly under for quite a while. We headed back about 1:30.

Saturday was rainy when we first got to the rocket pasture, but then the sun came out for a beautiful evening. I put up the big Praetor on a Loki I377. What a great motor for this rocket. The main came out but it never fully opened. I should have fluffed it up and repacked it with baby powder...it was very humid from the rain. Launch was perfect, drogue at apogee. It wasn’t really falling very fast, but those are some big fins fixing to hit the ground.

I was expecting the worse when I went out to recover. No damage at all! This thing is pretty tough! It was hard to get many pics with the sensory overload of LDRS, but here’s a couple of vids I put on YouTube.

I saw it go up! When the chute fouled I had flashbacks to this thread, glad the soft dirt treated you well.

I think the thread title question has now been answered definitively.

Great job!

I saw this picture on the LDRS Facebook page. Photo credit to Tim Sapp.

Nadine, the rocket picture lady (photosbynadine) posted a cool launch pic on the LDRS38 facebook page. I ordered a print of this one at the field. She's a trooper for standing out in the heat getting these pics for us.

https://www.facebook.com/photo.php?...V1Rg1YKp1mCHEJLSZ3et3C1cEpfU5aPGDSL7uAW&ifg=1

The Facebook link above is dead, but I got the print in the mail. Photo credit is on the scan, so I hope she’s okay that I share. I think it’s a really cool shot.

PR4ETOR going up on a Loki I377 at LDRS 38.

I'm about to fly a project on this very same motor...What was the weight/altitude on the I377?

Very nice project by the way. I saw it at LDRS and never got a chance to meet up with you. Looks much better in person than in photos.

-Dave

Had to check my notes....dry weight is 6.7 lbs. altimeter beeped out 1470 ft. Great punch off the rail. It had the fins whistling good.