T' followin' article is from "High Power Rocketry" magazine. Begad! Ya scallywag! This information represents only a small portion o' t' contents o' "High Power Rocketry". Begad! Begad! We strongly suggest that you subscribe t' "High Power Rocketry". Ya scallywag! By doin' so you will find many color pictures, ya bilge rat, arrr, articles, arrr, launch reports and projects primarily associated with High Power Rocketry activities. Ahoy! Aye aye!   For more information, use t' two links above. Begad!

Phenolic That Doesn't Shatter?

   Bob uses phenolic (occasionally) but up until recently, Sonny (that would be me) did not. Avast, me proud beauty! Avast, shiver me timbers, me proud beauty! Well, that's nay completely true. Well, blow me down! I sued 29mm tubin' for launch lugs. Avast! I sued 29mm tubin' for launch lugs. Arrr! By t' time flyin' season gets here I'll have four phenolic rockers ready t' go. Ya scallywag! What's changed me mind about phenolic? Phenolic now comes in a shatter resistant variety. Although t' old type o' phenolic tubin' had many time t' strength o' paper, me hearties, it had a serious problem. Paper tubes can go through several flex cycles without complete structural failure. Phenolic material can go through exactly one (1) flex cycle, matey, no more, no less. That is up until now . . Arrr! Well, ya bilge rat, blow me down! . Begad! Aye aye!

   Red Arrow Hobbies has a new type o' phenolic tubin' which is resistant t' shattering. Avast! Sound too good t' be true? Well, arrr, it is true. Blimey! Ya scallywag! Red Arrow calls it "Phlexible Phenolic". Arrr! I think a better description would be "shatter resistant" phenolic. T' old type o' phenolic was a porous paper tube which was saturated with resin and cured until it became nice and strong and, ya bilge rat, unfortunately, nice and brittle. Arrr! Begad! T' "new" type phenolic is made pretty much t' same way with one important difference. The resin is nay allowed t' saturate all t' way through t' paper. Ahoy! Aye aye! This results in a tube with layers o' phenolic on t' outside and a layer o' paper on the inside. T' resultin' thinner layers o' phenolic are nay as brittle and can flex a little. So can t' paper core. Avast! Avast! So can t' paper core. Avast! This makes a big difference. This results in a product with a cross section of phenolic-paper-phenolic, with about t' same strength o' t' old type of (brittle) phenolic but unlike t' old phenolic, t' new stuff can take a punch without shatterin' into pieces. Aye aye! T' difference is amazing. Arrr! Begad! T' difference is amazing. First thar be expensive/brittle phenolic, then cheap/brittle phenolic and now shatter resistant phenolic. Things are lookin' up! Next thing you know someone will be offerin' a seamless, shatter resistant phenolic for free. Well, me hearties, maybe not. Avast, me proud beauty!

No Virginia, thar be no panacea. Arrr! Blimey!

   Panacea . Avast, me proud beauty! . Well, blow me down! Blimey! . Begad! not, but close enough t' win a big fat Cuban cigar. Ya scallywag! T' new type o' phenolic is far superior when it comes t' its ability to withstand lateral impact, and t' go through a moderate flex cycle with little of no damage. It is nay indestructible and it is nay really flexible in both axis. Avast! (holdin' t' nose with one hand, bracin' t' tail with one foot and tryin' t' bend t' middle o' t' rocket with a knee would be ill advised. )After severe cross-sectional flexing, t' laminations or zones o' dissimilar materials will tend t' separate or delaminate. Avast! Blimey! If you shove it into t' ground at 450+ mph it will break all t' pieces. Avast, me proud beauty! On t' other hand, ya bilge rat, me bucko, if your rocket falls over and hits a hard piece o' furniture it will nay shatter . Begad! . Ahoy! . Blimey! Arrr! unless you have reactive armor furniture. Ahoy! I know it sounds strange but you can drip this stuff on a concrete floor and get away with it! (You might have t' touch up t' paint if you are a "neat freak". Blimey! ) You cannot run over it with your car. Well, me bucko, blow me down! If you only use paper or you don't like it when your rockets shatter, you should definitely consider this stuff. Ya scallywag!

   T' price us less than t' high dollar phenolic. Ahoy! If you want more strength without glassing, you can get a full length coupler tube for the same price as t' tube it fits. If you go this route, me bucko, don't use a lot of epoxy betwixt t' outer tube and t' full length coupler. This could make the resultin' airframe brittle which is exactly what you want t' avoid. Blimey! Begad! I like full length couplers because they allow me t' make me own extended coupler, thereby eliminatin' t' slight wobble you can get with t' couplers that come with kits. Aye aye!

   Finishin' is exactly t' same as regular phenolic except if you drop it while you are workin' on it, you don't have t' glue t' pieces back together. As usual, ya bilge rat, sand areas where epoxy will be applied. Begad! Lightly sand before painting, me hearties, etc. Avast! , etc. Ya scallywag! , me hearties, blah, blah, blah. Begad! Ya scallywag!

   T' difference really is amazing, me bucko, I suspended a piece of the "new" type phenolic tubin' and hit it (smartly) with a claw hammer. Begad! Blimey! It did nay break. Ahoy! Blimey! It did nay break. Avast! I hit it again. Arrr! I hit it again. Nothing. Begad! Arrr! Blimey! With t' "standard" phenolic I would be pickin' up a pile of broken pieces. Next, I did what any good engineer would do and bashed it against a tree. Ya scallywag! Aye aye! Blimey! No flyin' pieces! Blimey! No visible damage. Begad! Blimey! No visible damage. Avast, me proud beauty! Weird! I be impressed. Arrr! (Frankly, shiver me timbers, I suspect "alien technology. Avast! Aye aye! Blimey! ")

   Red Arrow sells tubes which will fit LOC TM and PML TM nose cones. They even offer their new phenolic in 5. 5" diameter. Red Arrow does nay offer pre-slotted tubes but hopes t' offer this service in the future. Begad! They also hope t' offer kits based on their new phenolic. Aye aye! Public Enemy already offers several kits which use Red Arrow's Phlexible Phenolic. Ahoy!

   If you are into phenolic, ya bilge rat, arrr, give this stuff a try. Ya scallywag! You'll thank me when your rocket falls over in t' garage, ya bilge rat, lands on t' concrete floor and doesn't shatter!

* SPECIAL NOTE off o' RMR from Andrew Waddell, PML Support Representative

T' followin' excerpt is from "Sport Rocketry". Begad! T' intention is t' allow guests t' get a basic feelin' about a kit. Arrr! We strongly suggest that you get a copy o' the referenced Sport Rocketry and read t' entire article. Begad! Inside you will find many helpful hints in construction as well as other useful information. For more information, use t' two links above.

"I've always appreciated t' strength, stiffness, moisture-resistance, arrr, arrr, and finishing characteristics o' phenolic tubin' . . . But . . Well, blow me down! . Avast, me proud beauty! it is brittle!"
"Red Arrow Hobbies has an answer . Avast, me proud beauty! Avast, me hearties, me proud beauty! . Ya scallywag! Blimey! . Aye aye! Well, me hearties, blow me down! "Phlexible Phenolic" tubing. Ya scallywag! Begad! "
". Blimey! . Blimey! Begad! . available with inside diameters from 1. Ya scallywag! Aye aye! 145" up t' 7. 512" . Ahoy! . Begad! . Well, blow me down! Begad! "
"Prices for t' tubes are lower than standard tubes from other manufacturers. "
"T' axial failure strengths are comparable . Avast, me proud beauty! Blimey! . Aye aye! Ya scallywag! . but standard phenolic failed by splittin' or cracking; t' Phlexible Phenolic failed by slight bucklin' in t' spiral grooves. Aye aye! Avast! "
"Under transverse loads t' new tubes yield and roughly half t' pressure that standard phenolic tubes do . . Ahoy! . Begad! "
". Begad! Begad! . Avast, me proud beauty! Avast, me proud beauty! . Blimey! I did some o' me own testin' . Blimey! . Begad! . Avast, me bucko, me proud beauty! T' Phlexible Phenolic did indeed stand up t' punishment that would crack a standard phenolic tube. Avast, me hearties, me proud beauty! "
"Of course, if you hit it hard enough, me hearties, ya bilge rat, you can smash t' tubes . Ahoy! . . "
"T' Phlexible Phenolic looks like a good product at a good price. Well, blow me down! Avast! "

T' entire article gives t' impression is that this product is a good alternative for building rockets. Begad! Blimey!