Micro-hybrid 22 mm rocket motor (D power class) - complete hardware         $99  Current availability 4
Rebuild kit (injector, nozzle, O-ring set)                                                                    $30

Mini-hybrid 25 mm rocket motor (E power class) - complete hardware            $125  Current availability 2
Rebuild kit (injector, nozzle, O-ring set)                                                                    $35

Mini-max 29 mm bi-hybrid prototype motor                                                           $120  Current availability 1
This is a specialty bi-hybrid only motor designed to use modified D class BP
motors for propellant.  Because bi-hybrids use BP inside a metal motor case
Tripoli level 2 certification, and preferably research experience, is required
​for purchase.

Mini bi-hybrid 25 mm prototype motor - complete hardware                             $145  Current availability 0
Occasionally I manufacture one of these prototype specialty bi-hybrid
motors for sale. It is distinguished from the traditional mini-hybrid by
1) a shorter case optimized to fit the modified C6-0 bi-hybrid grains,
2) a lightweight case included, 3) a specially machined reduced weight
injector housing and 4) a second external snap ring groove ½” above
the typical groove. All of these modifications allow this motor to be:
1) piston launched, 2) staged, 3) bi-hybrid powered or 4) all of these in
one flight! Applying all four potential power boosts has allowed this
motor to fly rockets to 2845’ altitude. This motor is intended for
experienced small hybrid users and, because bi-hybrids use BP inside
a metal motor case, Tripoli level 2 certification, and preferably research
​experience, is required for purchase.
Rebuild kit (injector, nozzle, O-ring set)                                                                     $35
 
Lightweight casing (33% lighter for the micro, 28% lighter for the mini)         add $12

A note on lightweight casings…micro and mini-hybrid motors are heavy
for their power class because of a number of reasons not the least of
which is the steel nitrous cartridge. In an attempt to obtain the best
flight performance out of these motors I offer this lightweight case
option (typically 10% to 20% improvement in peak altitude). The
tradeoff is robustness as these lightweight cased motors operate
near temperature and pressure design limits; therefore all things must
go right, and the tolerance for error is minimal. If you are just starting
out with these motors I suggest purchasing an extra standard weight
casing when you order a lightweight motor. Perform all your tests
(both static and flight) with the standard weight case and then fly
your performance flights with the lightweight case!

Long casing (7” for the micro, 9” for the mini)                                                            add $10

Very limited testing suggests adding one inch to the case length may
increase the total impulse by about 10 to 15%. For those of you willing
to experiment with this, I offer a long case version. This version makes
less efficient use of raw tubing so costs a bit extra.

Extra external snap-ring groove                                                                                      add $5

This groove is placed a half inch above the standard external snap-ring
groove and is useful in the specialized cases of certain two-stage flights
or piston launches. In both of these cases another body tube will be slipped
over the rear end of the motor and the extra half inch of motor case below
the second snap-ring allows for this. Note that there is a slight probability of
increased case burn through compromise by adding this second groove.

Extra thick injector housing floor                                                                                no additional cost

Some nitrous cartridges are difficult to puncture (Quick Whip 9 gram cartridges
for example). A thicker injector housing floor will help but will make ignition
a bit more difficult. If you plan on routinely using such cartridges you can
specify this extra thick floor with your order. However, if your standard floor
injector housing fails because of this problem it is covered at no cost under
warranty.

Dexter Labs Micro-hybrid to 24mm adapter tube                                                                  $3
Dexter Labs Mini-hybrid to 29mm adapter tube                                                                    $4

Each motor is precision "hand"-machined from aluminum, brass, stainless
steel and graphite. The motor is supplied with a copy of an extensive user's
manual (also available as a stand-alone product) including background and
history, assembly and launch instructions, performance data, resource lists
​and more.
​

Dexter Labs small hybrid family (left to right): Micro-hybrid, Mini-hybrid, Stretch Mini-hybrid, Mini-max Bi-hybrid, Turbo APCP Bi-hybrid.