Loc Pk-66 Ultimate; Now a build thread w/pictures.

The Rocketry Forum

Help Support The Rocketry Forum:

jimzcatz

Boss, Carolina Rocket Mafia
Joined
Jan 22, 2009
Messages
3,892
Reaction score
146
Location
Hurdle Mills NC
First 4" rocket I ever bought,except the Estes Saturn V. What do you wanna know. Yes, it flies fine on 7 D12's
 

heada

Well-Known Member
Joined
Jan 18, 2009
Messages
3,176
Reaction score
548
Location
Indianapolis, Indiana
Great kit. I fly mine on 6xF42 and 1xH180. It gets a good 30 feet up before the H comes up to pressure. The fin connection is weak, I have had 3 fins break loose now. You may want to re-enforce the fin joints.
 

jimzcatz

Boss, Carolina Rocket Mafia
Joined
Jan 22, 2009
Messages
3,892
Reaction score
146
Location
Hurdle Mills NC
Never had that problem. I glued fins to mmt valleys and extended slots all the way to the rear. Installed fin/mmt assembly as one unit.
 

Wallace

Sponsor
TRF Sponsor
TRF Supporter
Joined
Feb 16, 2017
Messages
2,514
Reaction score
459
Well....That's all good news because I impulsively oredered one. Assume woodglue and paint'll be fine?
 

kuririn

BARGeezer
TRF Supporter
Joined
Oct 3, 2016
Messages
4,437
Reaction score
1,961
Location
Hawaii
LOC used to have a download page with instructions for most of their kits. Seems to have disappeared, maybe the new owners took it down.
 

Rocketjunkie

Addicted to APCP
Joined
Jan 19, 2009
Messages
4,069
Reaction score
280
I cloned one as the kit was OOP at the time. CRs not needed as the 7 29mm tubes fit a coupler perfectly. Slide coupler into airframe, cut fin slots and install fins. I added a single T-T layer of 3 oz glass. Mine is dual deploy and has a bulkhead in the booster for recovery attachment. Flies well to 950 feet on 7 Estes F15s. Havent tried anything beyond an I204, 2 H87, and 4 F15 yet (4000 feet).
 

Wallace

Sponsor
TRF Sponsor
TRF Supporter
Joined
Feb 16, 2017
Messages
2,514
Reaction score
459



PK-66 ULTIMATE

$109.95

Quantity
SKU: PK-66 Categories: Rockets, 4.00" Diameter, Retro
Description
The Pk-66 Ultimate is an old LOC standard. Sporting 7x 29mm motor mounts, 6 fins and a payload. This kit is made to handle your transition into the cluster realm. One of the Retro series it’s not for the faint of heart. Light weight and made to punch a hole in the clouds!
All LOC/PRECISION 4″ Advanced series kits include heavy duty airframe and motor mount tubes, high-grade precision-cut plywood fins, centering rings, rip-stop nylon parachute or streamer, nylon webbing shock cord with sewn loops, and mount, launch lug, polypropolene nose cones and instructions.
 

Wallace

Sponsor
TRF Sponsor
TRF Supporter
Joined
Feb 16, 2017
Messages
2,514
Reaction score
459
After literally hours of searching.....That is all I've found. Seems to be impervious to my ocdc...
 

Wallace

Sponsor
TRF Sponsor
TRF Supporter
Joined
Feb 16, 2017
Messages
2,514
Reaction score
459
Very! Appears to be a nice strong stack. Assume it'll take whatever you can throw at it? Has it flown/did you add conduits for airstarts? Thanks for the pics btw...
 

Wallace

Sponsor
TRF Sponsor
TRF Supporter
Joined
Feb 16, 2017
Messages
2,514
Reaction score
459
After finding my glasses; Are those printed centering rings?
 

dhbarr

Amateur Professional
Joined
Jan 30, 2016
Messages
6,369
Reaction score
1,019
Very! Appears to be a nice strong stack. Assume it'll take whatever you can throw at it? Has it flown/did you add conduits for airstarts? Thanks for the pics btw...
After finding my glasses; Are those printed centering rings?
3d printed yes, mine no. Those are from the forum here, but search engines haven't finished rebuilding after the changeover so I haven't tracked down the original post.
 

Wallace

Sponsor
TRF Sponsor
TRF Supporter
Joined
Feb 16, 2017
Messages
2,514
Reaction score
459
Super cool. Assume the plywood rings are weak at best? ttw fins carry the load anyway?
 

patelldp

Well-Known Member
Joined
Jan 23, 2009
Messages
5,522
Reaction score
78
The mounts posted are mine...and yes, rings are 3D printed. Rocket hasn't flown.
 

Wallace

Sponsor
TRF Sponsor
TRF Supporter
Joined
Feb 16, 2017
Messages
2,514
Reaction score
459
Aye! 7 total bp f-15's ? Nice...
 

jimzcatz

Boss, Carolina Rocket Mafia
Joined
Jan 22, 2009
Messages
3,892
Reaction score
146
Location
Hurdle Mills NC
No, not the fins. The load is carried by gluing the fins in the valleys between the mmt, then installing the mmt/fin assembly into the tube as one unit.
 

markkoelsch

Well-Known Member
Joined
Mar 18, 2009
Messages
4,300
Reaction score
147
No, not the fins. The load is carried by gluing the fins in the valleys between the mmt, then installing the mmt/fin assembly into the tube as one unit.
So, to clarify for the OP, you mean to extend the fin slots to the base of the airframe, then insert the entire motor mount/fin assembly into the airframe, correct?
 

jimzcatz

Boss, Carolina Rocket Mafia
Joined
Jan 22, 2009
Messages
3,892
Reaction score
146
Location
Hurdle Mills NC
Well yea. Doesn't everyone? I mean it makes the most sense. Plus strongest method. I do that with every rocket I build.
 

Wallace

Sponsor
TRF Sponsor
TRF Supporter
Joined
Feb 16, 2017
Messages
2,514
Reaction score
459
Exactly...I think. No thrust ring needed/wanted?
 

Wallace

Sponsor
TRF Sponsor
TRF Supporter
Joined
Feb 16, 2017
Messages
2,514
Reaction score
459
Just wanted chime in to give props to LOC. My Ultimate arrived on Tuesday and after opening the box I discovered some damage. Unfortunately it was at the slotted end of the booster tube otherwise I'd have simply cut it off and moved on. Shot an email to customer service and got a reply from Jay almost immediately. 2 days later Priority Mail box with perfect replacement parts is at my door. Now that's how to run a business..
 

new2hpr

Well-Known Member
Joined
Jan 23, 2009
Messages
967
Reaction score
38
Location
Colorado
I've got one. Loves to eat G80s!
If you plan to use HP reload casings, be careful to open up the rings to give the motormount tubes a bit of room for the aft closures. Butting them tight won't work. Ditto on the suggestion to nest the fins between motor tubes. I did like the instructions (fins lined up on motor tubes and just through the airframe) and they frequently crack at the fillet.
 

Wallace

Sponsor
TRF Sponsor
TRF Supporter
Joined
Feb 16, 2017
Messages
2,514
Reaction score
459
Yup. Good call on the motor mount(s). I do have a stash of G-80's for "fit up". I'm gonna try to keep it light, my tendencies are to completely over build everything. I was given a big bin of Mono Kote/iron/woodpecker, even a mini heatgun by fellow Trf'er cvanc that I've been looking for an excuse to put to use. Thanks Carl..
 

Wallace

Sponsor
TRF Sponsor
TRF Supporter
Joined
Feb 16, 2017
Messages
2,514
Reaction score
459
Never had that problem. I glued fins to mmt valleys and extended slots all the way to the rear. Installed fin/mmt assembly as one unit.
Just realized the fin tabs are apparently short enough so it appears their intent is to mount them directly to the motor tubes, not the "gaps". Since I'm currently PC-less/no Open Rocket, any opinions on CP location if I "bury" the fins that much deeper into the airframe? Will it lose too much stability or would it just be easier to make new fins?
 

Wallace

Sponsor
TRF Sponsor
TRF Supporter
Joined
Feb 16, 2017
Messages
2,514
Reaction score
459
Any opinions on fin material choice? I've pretty much decided to just re-make a set with .375" longer tabs to get them all the way into the mmt valleys without losing span by just burying the stockers deeper. They measure .120ish so probably 3mm 3 ply hobby plywood. I'm considering maybe using .90 G-10 to save some ass weight. Would that be a reasonable compromise between weight/stiffness? I will definitely build the can outside the airframe since it's my go to method, second being balsa strip fin pockets. I just think making (6 total) fin pockets that would have to fit/seal to the radius of the fin tubes would be just to damn time consuming.
 

Wallace

Sponsor
TRF Sponsor
TRF Supporter
Joined
Feb 16, 2017
Messages
2,514
Reaction score
459
Ok, Looks like this is turning into a build "type" thread. Meaning I doubt I'll boar you with the entire process, just the juicy bits. Make sense? Since I intend to build my Ultimate dual deploy the cardboard coupler from Loc just wasn't gonna make the cut. Not that there's anything wrong with it if used as intended (glued in). What I needed was a real av bay/coupler. First thing I did was grab the 4" av bay outta my Mac Pluto SLAM. Rats, close, but too big on the o.d., no fit. I called Mike @ Mac Performance Thursday afternoon and asked him if he could make me a coupler and bulkplate combo that would work with my existing sled, just need a smaller o.d. to fit my Loc tubing. I gave him the dimensions and I'm fairly certain he had it completed before we finished our conversation. He got it in the mail an hour after we spoke, it showed up this morning and you couldn't get a better fit if you tried. Thanks Mike.
 

Attachments

Last edited:

Latest posts

Top