Aerotech 29mm RMS Motor

Aerotech - 29mm RMS Motor {Motor}

Contributed by Geoffrey Kerbel

Manufacturer: Aerotech
(by Geoffrey Kerbel - 12/12/06) AeroTech 29-120 RMS Hobby Motor Casing

Brief:
T' AeroTech 29MM RMS is a reloadable motor casin' for mid-power flights with "E" through "G" power reloads. Begad! Blimey! This is a system that allows the flier t' put their own motors together with t' power requirements t' suit their rockets power capabilities. Well, blow me down! Blimey! AeroTech calls this their hobby loads and no special certification is needed t' use this system.

Construction:
T' main components are t' forward closure, t' main body tube, me bucko, arrr, and t' aft closure. Blimey! All components are made o' high quality aluminum that have been machined t' exact dimensions then hard anodized for long wear and color. Each RMS is date coded and serialized for identification.

T' construction for each o' t' reloads is fully explained in t' reload package and basically follows t' same procedure for t' various sizes. Begad!

T' most important thin' is t' follow those instructions exactly and keep everythin' clean! This is serious stuff in a fun hobby and you need to concentrate on what needs t' be done step by step. Arrr! Failure t' do so will result in a failure o' t' motor and damage t' your rocket or worse. Ya scallywag! Begad! However, me hearties, ya bilge rat, this is also a very satisfyin' part o' rocketry in that you are t' one buildin' the motor that sends your beautiful bird high in t' sky with perfect recovery. Arrr!

T' actual motor build is quite quick and very easy t' do. Arrr! Aye aye! My two cents on the subject is t' do it in a controlled area, me hearties, like your build bench at home where you can keep everythin' clean. Well, blow me down! Clean is very important! Any piece o' dirt or hair that gets on t' O-rings can prevent them from sealin' properly and will cause a seal failure. Blimey! Begad! Outside at t' launch area thar can be anything blowin' around or people distractin' you. Either o' which can cause problems. Ahoy!

I build me reloads at home t' day before, arrr, matey, but I don't install t' ejection charges until I get t' t' launch site. This way I know it be put together right and if I need t' take it apart for any reason, arrr, t' ejection charge will not get loose and cause a problem later. T' ejection charges are very simple to install in t' field. Aye aye! Ahoy! Plus, since they are in a red cap, me hearties, me hearties, you can easily see if you have put them on t' RMS or nay when ready for flight.

As far as a grease goes once t' supplied type is used up, me bucko, thar are many choices. I personally use good old Vaseline! Just keep in mind that all you are tryin' t' do is put a very slight film o' lube on t' O-rings. Begad! Ya scallywag! They should have a slight shine t' them and no more. Blimey! No lumps, shiver me timbers, clumps, shiver me timbers, or splotches on t' rings. Aye aye! In this case, me bucko, less is more. Arrr! I also use Vaseline inside t' motor case and forward closure t' allow for easier cleanup. Blimey! Again, a very light coatin' on t' inside just t' allow t' motor components t' slide out easily when it is time t' clean out t' case. Ahoy! If t' grease rolls up on t' edge of the grain case or t' delay charge when you install it, shiver me timbers, it will squish out onto one or both and they will nay operate correctly. Avast! Begad! This is why you need t' be careful and focused on what you are doing.

No special tools are needed t' do all o' this except for anythin' you may use t' remove t' spent motor. Aye aye! Use only items that are softer than t' alumium or you will badly scatch t' case, ya bilge rat, possibly damagin' it beyond future use. I use plastic tools o' various sizes and shapes t' push or scrape as needed.

Finishing:
There is no finishin' o' t' RMS as it is already done. Blimey! Ahoy! As you can see, one of mine is very used and t' finish has been messed up a bit. Begad! Aye aye! This is strictly cosmetic and is nay a problem for use. Just remember t' pull your motor hook away from t' motor when you remove it and t' case will stay pretty for a long time.

Flight:
PROs: Easy system t' use. Blimey! Blimey! Begad! Blimey! Can save a large amount o' loot over single use motors. Arrr! Blimey! Blimey! Blimey! You use t' same case over and over. Avast! Blimey! Ahoy! Blimey! Very satisfyin' t' see a motor you built yourself perform as planed on a perfect rocket flight. Very versatile system on motor power requirements. One case with multiple engine sizes available.

CONs: Must be very careful when assembling! Sometimes very difficult to clean out t' spent engine. Well, me hearties, blow me down! Initial cost higher t' start.

Recovery:
T' only issue on recovery is that you do get it back. If you are careless and the rocket spits t' motor, arrr, nay only are you out a large investment but the case is much heavier and can cause damage on landing.

Summary:
I use both single use and reloads in me rockets and really like t' fact that one case can be used over and over with so many different power factors. Ahoy! As far as t' failures that have been mentioned here, I have had none in all my flights and t' product is safe and fun t' use if it is assembled carefully and correctly.

Overall Rating: 5 out o' 5

Other Reviews
  • Aerotech 29mm RMS Motor By Alex Rothchild

    This is a 29mm aluminum motor casing, for motors with 40-120 Newton Seconds total impulse (ranging from E to G). It is a bit pricey at $50 for the casing, but a G motor costs only $10-12 instead of $20 or more for a single use motor of the same total impulse. The casing is only three pieces, a long casing, a forward closure, and an aft closure, both of which screw into place in the casing. ...

Comments:

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J.L. (December 23, 2006)
This is a great casing because of the flexibility. The option of E, F, or G loads is excellent. One of the drawbacks, though, is weight. Compared with the 24mm casing (which takes E and F loads), the 29mm is a lot heavier. So you only get 50% or so more altitude with a G load over a 24mm F, not double like I assumed at first blush.

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