Bought this one on Ebay a few years back, just now getting around to it.

Nice large, four D engine cluster. Should be fun.

Build starts off with the engine mount.
The centering rings are die cut thin plywood. Mine were a little warped, and the die Estes used didn't seem to be the best.

I misted the wood with water, sandwiched between wax paper, then a couple of boards with a lot of weight. Waited a week and they are flat again.

With the die cut, it took a lot of light sanding and fitting to get all of the rings to fit correctly.

I used CA to tack everything in place, then epoxy for fillets.

In the pics, you can see the four motor mount tubes, four motor clips, and the ply centering rings.

The vertical slats are also ply, and for TTW fin attachment.

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Next is this nicely machined aluminum aft plate that finishes off the rear of the motor mount.
I am assuming this is for heat protection?
Whatever it's for, it looks cool!

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A standard die-cut cardstock shroud is then formed and glued to the aft and 2nd centering ring.

That's it for the motor mount.
It will need to wait on the fins for test fitting before installing in the BT.

More to follow...

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Very nice build. It looks like you went stock. It seems to me that motor mount was just begging to be modded for E9 engines. I don't know how you resisted that.

There were two versions of the PRO Series Patriot as I recall.

The original version was set up to use 4 D12 motors.

A later version would allow the use of D12s or (Estes) E15 motors.

This Patriot is a pretty heavy model when finished and ready to fly.

As 'someone' else might say, "Be sure to contact and notify the FAA before flying this model".

Bob

A patriot or any other rocket with 4 E9s (or old E15s back then) needs a WAIVER not notification, and the flier must be HPR certified. This is due to the propellant mass exceeding 125g.

http://www.rocketryforum.com/showthread.php?t=41082

See the handy "limits info sheet" link in the first message.

__________________
-Fred Shecter NAR 20117 (L2)
Southern California Rocket Association, NAR Section 430

THIS model represents good use of E9's...in a cluster, which is the ONLY way they will lift anything of decent mass.
I'm pretty sure one can use 2 D12's and 2 E9's and stay under the 125g propellant limit, in case the propellant police are staking out your unwaivered launch area.
Of course one could get a much higher impulse flight using a couple of G80's and still stay under the LMR upper limit.
ONE G80 would have more impulse than 4 E9's and would be much less complicated to fly.

__________________
When in doubt, WHACK the GAS and DITCH the brake !!!

Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't !
Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY.
ALL systems are GO for MAYHEM, CHAOS, and HAVOC !

Yeah....but Estes doesn't make a G-80....

__________________
Don
NAR 53455
"Carpe Diem"

Yeah, Estes does not make a G80 (and probably never would make anything that cool with that much impulse), but plenty of sources for 29mm centering rings can be found to fit that thing with a REAL engine mount.
I say fire it up on a H128 !

__________________
When in doubt, WHACK the GAS and DITCH the brake !!!

Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't !
Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY.
ALL systems are GO for MAYHEM, CHAOS, and HAVOC !