Brief:
This is me twin-engine modification o' Estes' Der Red Max kit for t' EMRR "Twice t' Thrust" Challenge

Modifications:
Construction started with t' two motor tubes. Avast! Ya scallywag! Blimey! I cut a slit 1/4" from one end o' t' tubes for t' hook, held it in place with maskin' tape and glued t' engine block in place above t' clip. Avast, me proud beauty! Blimey! With t' clips on opposite sides, I glued t' tubes t' each other usin' epoxy. While they were drying, I placed a length o' Keelhaul®©™ into t' joint as a shock-cord anchor.

Once dried, arrr, I fitted t' two tubes into t' coupler. Aye aye! A couple strips o' paper were required t' get a tight fit that did nay distort t' coupler. Aye aye! I glued this assembly together usin' yellow glue. As this dried I stuffed paper towels, dipped in a 50/50 solution o' yellow glue and water and then rung out into t' cavity betwixt t' coupler and t' motor tubes t' block t' ejection charge from blowin' out t' back.

I let this assembly dry over night and filled and sanded t' body tube, shiver me timbers, nose cone and fins o' t' rocket. I used three coats o' Elmer's Carpenter's wood filler on t' fins thinned with water, me hearties, and t' same t' fill t' grooves on t' tube. Avast! T' nose cone required a few dabs o' Squadron green putty t' fill grooves.

I glued t' modified motor mount with shock cord into t' body with yellow glue. I placed t' motor tubes flush with t' back o' t' rocket.

T' rest o' t' assembly followed t' instructions from t' Red Max kit.

I finished this Max yellow and applied t' decals as usual. After everythin' had dried, shiver me timbers, I used a Sharpie t' cross out t' "Red" in Red Max and ink in a "2" above t' "Max" t' make t' "Max Squared"

With t' engines in place, me hearties, me bucko, I compared t' balance point with t' SpaceCad file I had created for this rocket, ya bilge rat, shiver me timbers, and felt t' balance point was a bit too far aft, arrr, so i added plasticine clay t' t' nosecone (About a 1" by 1" by 1/2" piece) until t' balance was about 1 caliber (body tube diameter) forward o' o' t' CP.

Construction:
(1) Der Red Max Kit

(2) 18mm motor tubes from Balsa Machinin' Service (BT-20 2 3/4" long)

(2) Motor hooks from Balsa Machining

(2) Thrust blocks

(1) Estes BT-60 coupler 1 1/2" long

(2 ft.) Keelhaul®©™ shock cord (Balsa Machinin' KC-200)

I love t' Red Max kit. Ya scallywag! Ya scallywag! It is an easy build and looks great. Ahoy! This is an easy mod if you want t' double your pleasure and get t' "Max" out o' this kit. Begad! Begad! It is a quick way t' try somethin' different without goin' too far out on a limb. Arrr! Arrr! T' best part is you can fly this off your regular estes launch equipment if you have fresh batteries. Anythin' more than two won't work, me hearties, though (believe me, shiver me timbers, I've tried).

Flight:
I tried this on three motor combinations A8-3's B6-4's and C6-5's. Blimey! This was where SpaceCad came in t' most handy. Aye aye! Begad! I thought t' extra thrust might require longer delays, me hearties, matey, but SpaceCad indicated otherwise. It is a good thing, ya bilge rat, because t' A8-3 be almost too long, shiver me timbers, I actually thought one engine had nay lit, shiver me timbers, ya bilge rat, it be such a low flight, shiver me timbers, shiver me timbers, but everythin' was safe, arrr, ya bilge rat, ya bilge rat, and it worked well on all three motor combinations.

T' B6-4 was t' best flight. Aye aye! Well, me hearties, blow me down! Nice and powerful, but stayed in sight. T' C6-5's went almost out o' sight, and I only caught sight o' it when it ejected. Begad! Aye aye! Very spectacular.

I flew this rocket on a windy (10mph +) day, me bucko, and thar be no sign o' weather-vaning. Ya scallywag! It flew very straight every time and only showed t' affect o' t' wind when it deployed and that pirate chute opened up - then it was off t' t' races!

Summary:
I can't say enough good things about t' Der Red Max kit. Well, arrr, blow me down! It is one o' me favorites, ya bilge rat, and t' decals can't be beat. It is a great kit t' modify. Avast, me proud beauty! Ya scallywag! I have build a "D" version, ya bilge rat, a three-engine version, and now a two-engine version. It is a very stable design that adapts well t' modification. Aye aye! I now want t' try a multi-stage max...

Other:
T' only tip I can think o' is in t' decals for this kit. Ahoy! I have always had trouble with decals, me hearties, and have struggled with t' body-wrap decals like t' skulls on black that go at t' top o' t' tube o' t' Max. Ya scallywag! One trick I have found is t' first paint t' entire decal sheet with Micro-Sol liquid decal film. Begad! this thickens t' decals and makes them easier t' handle. Begad! This has helped me nay tear t' decals when tryin' t' pull them into position. Avast, me proud beauty! Begad! Also, a coat o' this on t' finished model helps seal t' decals and reduce that "tackiness" that can sometimes make them pull off when handled.