Brief:
This is really a very simple modification involving two kits: the Estes Eliminator and the Quest Super Eagle. What I did was to swap the nose cone of the Eliminator with the payload section of the Super Eagle. I did this to mainly to create "Eagleator", a 24mm payload rocket suitable for altimeter calibration using C-F motors. Initially, I did this by modifying a Super Eagle for 24mm motors. (You can read this here on EMRR as a "tip/hint" I submitted earlier for the Super Eagle.) The "Eagleator" approach is faster, gives a more robust rocket, and as a by-product, gives you a "chopped" Super Eagle with much better performance on C-power than the original Quest product. I call it "SuperShort". You now have an extended Eliminator called "Eagleator" with altimeter capability and a shortened Super Eagle that flies beautifully on B and C motors.

Construction:
What could be easier? Buy a Quest Super Eagle kit and an Estes Eliminator kit. Assemble both according to the instructions, EXCEPT:

1. Place the launch lug on the Eliminator body tube 8" above the plastic fin can. Place the launch lug on the Super Eagle lower body tube 6" above the fin can unit.
2. Glue the base of the Super Eagle nose cone to the plastic tube coupler instead and glue this into the upper body tube (but wait to do this until after you attach the recovery system!) This will be the Eagleator payload bay. The upper nose cone half will be held to the payload bay with masking tape when flying.
3. Don't attach the recovery system to the plastic eye on what is now the Eagleator payload compartment. It is not strong enough to handle the ejection charge from AP motors. Use 8' of parachute cord for the Eagleator recovery system and save the underpants elastic shock cord that came with the Eliminator for some future project. Snip off that plastic eye, make a knot in one end of the para cord, pass it through the plastic coupler unit, and epoxy the knot in place. Make a knotted loop 18" below the payload bay and attach an 18" nylon TopFlite chute here. The other end of the shock cord is pulled using tweezers through a hole made 1.5" below the top of the "Eliminator" body tube with the shock cord knotted at the end. The knot is covered with a split BIC pen cap that was cut down the middle with a razor saw. Use epoxy for attaching this cap.
4. Use the Eliminator nose cone for the remaining bottom of the Super Eagle attaching it in the usual method. Use the shock cord and one of the plastic chutes from either of the kits. This "chopper" Super Eagle now honks on a B6-4 or C6-7 instead of struggling.
5. The fit of the swapped noses isn't perfect so you will need a few wraps of masking tape to hold them in place.

PRO: Swapping the upper ends of the Estes Eliminator and Quest Super Eagle creates two more interesting rockets (in my opinion). A simple, reliable payload rocket for altimeter calibration is a must, in my opinion. There's no other way to be sure the things are still working right if you don't get "standard" altitude readings on "standard" flights with known motor-rocket combinations. Plus, flying E30 or F21 SU motors or 24mm reloads in the Eagleator has less risk of being lost than in the somewhat lighter Eliminator.

CON: Well, you do have to buy two kits to make Eagleator, so it would be nice to have a use for the "shortie" Super Eagle you get out of the deal. They make great flying rockets for junior flyers and are much faster and higher flying than the original product.

Flight:
The Eagleator will fly well on the following motors: C11-3, D12-5, E9-6, E30-7, F21-8. "Standard" altitude using a 20g PerfectFlite MicroAlt on a 195g Eagleator with an 62g E9-6 is typically 1040'. It goes to about 470-500' on a D12-5 (altimeter) and about half this high on a C11-3 (my "guesstimate"--no altimeter). I have also flown Eagleator on a F21-8 and a E30-7 but without the altimeter riding along because I was a little afraid of a shred (although it held together just fine). Sims say 1700' on the E30 and 2300' on the F21 with 310-330 mph on both flights. When I'm doing serious altimeter flying for Cd determinations, I usually fly it with the D12 in Eagleator first to verify a reading of 470-500'--my "calibration".

I no longer have the shortened Super Eagle, since I don't fly C6s very much. I gave it away to a sad-eyed little guy who had just watched his Estes Alpha (or something like it) float away and sink into the bay on a windy day.