Preparing for our season opening launch at the Winnsboro field Sept 15th. I have six planned flights including my recently finished EnerJet 1340/20. Instead of using the Egg Capsule Nose Cone PNC-13E/ST-202, I used the Semroc BC-2025/BR-1320L balsa parts.

I used a 10" payload section according to the EnerJet 1340/20 specifications that Chris Timm provided. According to this brochure the basic payload length was 10" with 2", 5" and 12" available.

http://www.oldrocketplans.com/enerj.../enj1340-20.htm

This is my second EnerJet 1340/20 build and I just completed it last night. My first used the PNC-13E/ST-202 Egg Capsule parts and a 12" payload section and is pictured in post #4 of this thread.

http://forums.rocketshoppe.com/show...590&postcount=4

To offset the mass of the Ellis G35-10 motor I had to add an ounce of nose weight. I used a small screw eye and a quick link. I can add or remove small #10 washers to the quick link hooked to the screw eye to adjust weight. For your reference, the rocket before adding weight with a conservative amount of epoxy used for the build came in at about 6.5 ounces dry with surveyors tape for a streamer. I'm not sure how much surveyors tape is in there. I started rolling it around a dowel until I rolled up enough that I could just barely slip fit what I rolled up into the top of the tube. I used half of an 8 yard package of elastic from Wal-Mart and there was just barely enough room to close it up.

Should be an interesting flight to a RockSim predicted altitude of 4,800 feet. RockSim file attached. I took the other mass objects out of the file and although the capsule parts are Semroc and simmed as solid balsa, you'll have to rename them since they still bear the part #'s of the plastic parts I used in my first design.

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Attached Files

EnerJet 1340-20 Large Payload Capsule ST13 Semroc Balsa Capsule Parts.rkt (37.4 KB, 48 views)

__________________
Steve Naquin
TRA# 677 L2
NAR# 85518 L2
SAM# 0052

🚀 In Construction: Der Blue Maxx/Minie-Magg 5.5” & Vander-Burn MDRM Clone w/Stickershock23 Custom Decals
🚀 In Paint & Detail: USR Banshee
🚀 In Build Queue: Estes Doorknob w/Vander-Burn Rocketry Upgrade Kit [Sport Decor], Semroc Centurion-F, Semroc Egg Crate
🚀 In Repair: SLS Lil’ Hustler, SLS Aero-Dart 1969 Trim
🚀 Stay Tuned For Fall 2021 Launch Dates

I flew my EnerJet 1340/20 at the High Cotton launch in Winnsboro, LA. I used an Ellis Mountain G35-10 single use motor for this flight. The G35 is rated at 124.2 NS total impulse, with 32 N average thrust (G32) and a burn time of 3.9 seconds. This motor is very capable of sending a small 6.5 ounce rocket like the EnerJet 1340/20 to a respectable altitude.

The first picture is me attaching the clips to the QuickBurst twiggy igniter leads. The second picture I took just for fun and saved it without color to see how much my 1340/20 would resemble the 4th Ed. Handbook image in my previous post.

I had intended to get a lift off shot of this model but we were having launch control issues. Tried to fire it once, recycled the control and tried to fire it again. Nothing. Disarmed the launch control and I walked out to the pad and removed the igniter and put it right back into the motor because I could see it didn't fire.

When I walked back and the range was clear another countdown and launch attempt was made. Nothing. As soon as I put my camera down around my neck an relaxed, it was realized by the LCO the leads were swapped at the pads and the other pad button was pushed before I could get my camera ready and it tore off the pad. It was already about two seconds into the burn when I picked up my camera to snap the this third picture. You could no longer see the rocket but the thin thread of smoke was visible all the way to apogee and the small puff of tracking power was visible with binoculars. The long surveyors tape streamer could be seen reflecting the sunlight and it took a very long time to free fall back to land about 60 - 75 yards from the pad where I launched it.

A truly incredible flight with a really awesome motor to give this EnerJet model the ride it deserved.



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__________________
Steve Naquin
TRA# 677 L2
NAR# 85518 L2
SAM# 0052

🚀 In Construction: Der Blue Maxx/Minie-Magg 5.5” & Vander-Burn MDRM Clone w/Stickershock23 Custom Decals
🚀 In Paint & Detail: USR Banshee
🚀 In Build Queue: Estes Doorknob w/Vander-Burn Rocketry Upgrade Kit [Sport Decor], Semroc Centurion-F, Semroc Egg Crate
🚀 In Repair: SLS Lil’ Hustler, SLS Aero-Dart 1969 Trim
🚀 Stay Tuned For Fall 2021 Launch Dates

Nice!

__________________
Jon
SAM #0396
BAR 02/07
NAR 86940
KF4GUL
Aim high, fly straight!

Another nice flight, Steve.

You must have a large flying field to attempt a 'G' motor flight with a 1340/20.

Bob

We have field capability for motors up to and including M impulse and hybrid motors. Waiver to 10,000’ with call in windows to 15,000’.

I flew both the EnerJet 1340/20 and my EnerJet Egg Crate on G35's Saturday. I was able to get a nice lift off shot of the Egg Crate and I'll be updating that thread soon with the picture. The RockSim estimate for the EnerJet Egg Crate was an altitude of 5,406 feet.

On the opposite side of the road leading to the field (the road is green in the image below) was a cotton field that had not yet been cut. Everything else around was cut flat except the cotton field along side of the road that had plants very closely planted grown about 4 or 5 feet tall.

Unfortunately, even though the EnerJet Egg Crate was tracked all the way from ejection at apogee and most of it's descent it went down in that field a short distance from the road and was not recovered. It would have been no problem to recover if not for the crops as it was within walking distance from where we set up at.

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Attached Thumbnails

 

__________________
Steve Naquin
TRA# 677 L2
NAR# 85518 L2
SAM# 0052

🚀 In Construction: Der Blue Maxx/Minie-Magg 5.5” & Vander-Burn MDRM Clone w/Stickershock23 Custom Decals
🚀 In Paint & Detail: USR Banshee
🚀 In Build Queue: Estes Doorknob w/Vander-Burn Rocketry Upgrade Kit [Sport Decor], Semroc Centurion-F, Semroc Egg Crate
🚀 In Repair: SLS Lil’ Hustler, SLS Aero-Dart 1969 Trim
🚀 Stay Tuned For Fall 2021 Launch Dates