I have compiled a recommended ESTES motors list for the MPC Miniroc kits (please see below). The Estes 13 mm mini motors have the same impulses and delay times as many of the 13 mm MPC Minijet "A" motors, with one difference that gives the Estes mini motors a higher performance: The Estes mini motors are 1.75" long, while the MPC Minijet motors were 2.25" long and thus were slightly heavier, so the MPC Miniroc kits will fly higher on the equivalent Estes motors. Also:
Below are the recommended motors lists for these kits, with the MPC motors listed first, followed by the Estes motors. Two of the Miniroc kits set altitude records (also listed below; the records were given in their instructions sheets) of over 660 feet on MPC A3-4m motors (the same as the shorter & lighter Estes A3-4T motor), so imagine the improvements in their performance with the Estes A3-4T motor! [NOTE: I had to "re-construct" the MPC recommended motors lists for the Astrobee D and the Pipsqueak (going by their listed "dry masses" without motors installed) because I could find no recommended motor lists for them; I then matched them with Estes mini motors using the mini motor data given here (see:
http://www.spaar.org/Downloads/Libr...EngineSpecs.pdf )]. <***ADDENDUM--I had forgotten the AVI Minirocs catalog on "Ye Olde Rocket Plans" [see:
http://plans.rocketshoppe.com/pubs/...rocs/aerove.pdf ]--the list below has been amended as per the catalog's motor list.***> Here are the MPC Minirocs recommended motors lists:
ASP-1 (MPC: 1/2A3-3m, 1/2A3-5m, A3-4m, A3-6m, B3-5m, B3-7m; ESTES: 1/2A3-4T, A3-4T, A10-3T) <
ASP-1 weighs 17 grams w/o motor>
Astrobee D (MPC: 1/2A3-3m, A3-4m, B3-5m; ESTES: 1/2A3-4T, A3-4T, A10-3T) <
Astrobee D weighs 16 grams w/o motor>
Delta Katt (MPC: 1/2A3-3m, A3-4m, B3-5m [on kit card--MPC Minirocs catalog says 1/2A3-1m, B3-3m]; ESTES: 1/2A3-2T, A3-4T, A10-3T) <
Delta Katt glide weight is 5 grams>
Pipsqueak (MPC: 1/2A3-5M, A3-6M, B3-7M; ESTES: 1/4A3-3T, 1/2A3-4T) <
Pipsqueak weighs 6 grams w/o motor>
Super Star (MPC: 1/2A3-3m, 1/2A3-5m, A3-4m, A3-6m, B3-5m, B3-7m; ESTES: 1/4A3-3T, 1/2A3-4T, A3-4T, A10-3T) [went to 662 feet on an A3-4M] <
Super Star weighs 10 grams w/o motor>
Taurus-1 (MPC: 1/2A3-3m, A3-4m, B3-5m; ESTES: 1/4A3-3T, 1/2A3-4T, A3-4T, A10-3T) [went 668 feet on an A3-4M] <
Taurus-1 weighs 11 grams w/o motor>
I hope this information will be helpful.