EZI65 level 2 anyone?

Has anyone flown an EZI65 on a J or more?

A EZI65 will have no problem being used for L2 flights. It's up to you to build it strong.

Back in 2003 I retired it to the attic. Been sitting up there for 16 years thru hot and cold. Pulled out down checked it out, looks the same, joints feel tight, seems as good as ever. Considering flying it on a J500green motor to try and get my level 2 cert back.

crossfire said:

A EZI65 will have no problem being used for L2 flights. It's up to you to build it strong.

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Yeah its built plenty strong. It is extended for DD.

I just ordered a J270 WL DMS motor for my level 2 attempt. It ought to be plenty gentle enough.

That is a great motor for the ezi65

Cool. Can't wait to hear how high it goes.

cbrarick said:

Cool. Can't wait to hear how high it goes.

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I don't at present have a simulation program available but Thrust Curve says 2763' on the J270.
I also do not have an altimeter on board. It weighs with motor on the pad about 7 lbs. 4" diameter.

John Taylor said:

I don't at present have a simulation program available but Thrust Curve says 2763' on the J270.
I also do not have an altimeter on board. It weighs with motor on the pad about 7 lbs. 4" diameter.

Click to expand...

That will make for a great L2 cert flight. You should be able to see the whole flight. Good luck. Post some pictures.

My EZI is set up for dual deploy and has 3/16" thick fins. The 1/8" fins were prone to flutter and snapping off.
Flights:
ALT Motor Date Location Comments
3926 J425 (38-6G CTI) 8-7-10 Orangeburg, SC
3084 J90 8-8-10 Orangeburg, SC Keycam
3316 J90 9-6-10 Orangeburg, SC Raven set for baro apogee
2252 I85 11-12-10 Orangeburg, SC Set for baro apogee. Cruise missile flight recovered Dec.
2452 I300 1-9-11 Orangeburg, SC Both charges apogee - pinched wires
2204 I285 7-4-11 Orangeburg, SC
985 H242 9-5-11 Orangeburg, SC
7258 K160 (54/1706 D) 11-12-11 Orangeburg, SC 68-10 propellant
317 H175 (29/240 ss) 12-11-11 Orangeburg, SC 55-30 propellant
2317 I211 1-8-12 Orangeburg, SC
unk J500 7-7-12 Orangeburg, SC Raven failed, ballistic, destroyed
3035 J94 Mellow 8-30-14 Orangeburg, SC Rebuilt
3059 I125 10-11-14 Orangeburg, SC
4735 J180 (54/1280 ex) 11-9-14 Orangeburg, SC 60-13 sparky propellant
3923 J220 (54/852 EX) 4-12-15 Orangeburg, SC 68-10
2151 I285 5-25-15 Orangeburg, SC
2121 I285 6-9-18 Rembert, SC
1647 I357 11-14-15 Bunnell, FL
3936 J180 3-12-16 Rembert, SC
3209 J94 4-10-16 Rembert, SC
5285 J135 5-15-16 Rembert, SC
5592 J120 (54/1280 D) 9-5-16 Rembert, SC 68-10
2074 I175 11-12-16 Rembert, SC
4827 J150 4-8-17 Rembert, SC
770 H283 (SU) 5-6-17 Rembert, SC
1517 I154 10-14-17 Rembert, SC
2121 I285 6-9-18 Rembert, SC
5947 J120 (54/1280 D) 7-8-18 Rembert, SC 68-10
1720 I200 (38/480 ex) 9-2-18 Rembert, SC 60-13
3180 I100 (38/720D ex) 11-3-18 Rembert, SC 55-30
1796 I200 (38/480 ex) 2-9-19 Rembert, SC 60-13

Did you have the stock fins fail at speed then replace or did you make a preventive move and change them before a failure?

Seen stock built on K185 and K550. Flights both worked.

John Taylor said:

Did you have the stock fins fail at speed then replace or did you make a preventive move and change them before a failure?

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I had one in 1989 and a J125 took the fins off. When I built the current one,I built it with the thicker fins.

I saw an EZI launched on an L something. I noticed that recovery took a very long time. It returned home good as new. I would have sworn that the fins would have had issues. Great job Tim! You know who you are.

a 100% bone stock EZI will easily take a J180, J90, or any similar CTI motor.

I did my first cer2 on an EZI "like" rocket back in the early 2000s on a J90 with no issues. popped the chute' at apogee (4500ish feet) and got her back in perfect condition

I'm planning on flying it on an Aerotech J270. 2.6 sec burn expected altitude is 2700'
On pad weight is 3152g or about 7lbs.

John Taylor said:

Has anyone flown an EZI65 on a J or more?

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I would like to know too. I would like to use my EZ for my Level 2 cert. flight
I was thinking J270W or J3435WS or maybe a J425R
I just flew my EZ on November 16th at Plant City Florida with Tampa Tripoli
Stock EZI-65 with an 38mm motor adapter. Used an Aerotech I280DM set for 10 second delay.
Hit 3579 at apogee.
Delay blew at 3559 on the down side.
Jolly Logic chute release set for 500'
Awesome flight. Lots of oohs and ahhs at launch as the I280 is a sparky!

John Taylor said:

I'm planning on flying it on an Aerotech J270. 2.6 sec burn expected altitude is 2700'
On pad weight is 3152g or about 7lbs.

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curious how you get to 7 pounds. Even with two layers of glass and a full electronics bat you will be hard pressed to get much over 5 pounds.

the rocket I spoke too earlier in this thread was dead on 51oz w/o the motor

I just re weighed it and came up with 2560g dry, add J270 @ 642g equals 3217grams equals 115 oz. equals 7.18 lbs. with motor.
It is set for DD and is extended to 70" with electronics and double coats of paint. I have an inexpensive ( cheap) electronic scale, perhaps it's way off.

Using Thrust Curve it shows 3062' altitude. I dont know how accurate this site is. I don't yet have a proper sim program. Anyone?

John Taylor said:

I'm planning on flying it on an Aerotech J270. 2.6 sec burn expected altitude is 2700'
On pad weight is 3152g or about 7lbs.

Click to expand...

John Taylor said:

Using Thrust Curve it shows 3062' altitude. I dont know how accurate this site is. I don't yet have a proper sim program. Anyone?

Click to expand...

Picture of my extended EZI65

I have Open Rocket on my laptop and thrust curve on my phone.

I will take a guess at Cd then after some test flights on the rocket adjust the Cd to match the altimeter data. I use a digital postal scale that goes up to 50lbs.

~John

Wow, thanks very much. I JUST got a laptop with Windows operating system and haven't started it up yet. I got it specifically for Open Rocket. It will be a few days till I have time to set it up. Thanks again for your help.
John

I have an extended EZI like yours. It weighs in at 3254g (7.1lb) without a motor.
I ran a sim on it using the J270 and the J425. The 270 was fine and hit 2940 ft.
Good velocity off the rail, but the 425 was real solid off the rail and it went to
2820 ft. The 425 would be my choice.

Yes, my first choice was a RMS J420. However it was out of stock from my local vendor as well as the J350. So I decided on the DMS J270. I believe it will be a good motor for the rocket. It has a 2.6sec burn! Sounds like fun to me.

If all goes well I might go for the 425R. Love those red flames!
It's been 16 years since I used the DD altimeter in it and I can't remember anything about it so I'm gonna employ single motor deployment, 10sec delay, at the top and my JLCR to open the main.

Sure thing. I put up a video with what I think are good improvements to the kit.
jcrocket.com/certify-level-2.shtml

Thanks John!

John Taylor said:

Has anyone flown an EZI65 on a J or more?

Click to expand...

Not yet. It's about 80% built, and stalled. It was bought for me as a gift and ever so slightly modified by me, and intended all along for DD and an L2 flight.

While a little off-topic, another great kit to "extend" for Level 2 is the PML TETHYS.

Dave F.