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

Phenolic That Doesn't Shatter?

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

   Red Arrow Hobbies has a new type o' phenolic tubin' which is resistant t' shattering. Aye aye! Blimey! Sound too good t' be true? Well, it is true. Avast, me proud beauty! Blimey! Blimey! Blimey! Red Arrow calls it "Phlexible Phenolic". Avast, me proud beauty! Blimey! Blimey! Blimey! I think a better description would be "shatter resistant" phenolic. Ahoy! Blimey! Begad! Blimey! Blimey! Blimey! T' old type o' phenolic be a porous paper tube which was saturated with resin and cured until it became nice and strong and, arrr, me bucko, unfortunately, nice and brittle. Aye aye! Blimey! Well, blow me down! Blimey! Blimey! Blimey! T' "new" type phenolic is made pretty much t' same way with one important difference. Ya scallywag! Blimey! The resin is nay allowed t' saturate all t' way through t' paper. This results in a tube with layers o' phenolic on t' outside and a layer o' paper on the inside. Begad! Blimey! Begad! Blimey! Blimey! Blimey! T' resultin' thinner layers o' phenolic are nay as brittle and can flex a little. Aye aye! Blimey! So can t' paper core. Begad! Blimey! Ya scallywag! Blimey! Blimey! Blimey! So can t' paper core. This makes a big difference. Avast! Blimey! This results in a product with a cross section of phenolic-paper-phenolic, me bucko, 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. T' difference is amazing. Ya scallywag! Blimey! T' difference is amazing. Well, me bucko, blow me down! Blimey! Blimey! Blimey! First thar was expensive/brittle phenolic, me hearties, then cheap/brittle phenolic and now shatter resistant phenolic. Arrr! Blimey! Blimey! Blimey! Things are lookin' up! Blimey! Blimey! Blimey! Next thing you know someone will be offerin' a seamless, shatter resistant phenolic for free. Blimey! Blimey! Well, shiver me timbers, ya bilge rat, maybe not. Ahoy! Blimey! Avast! Blimey! Blimey! Blimey!

No Virginia, arrr, shiver me timbers, thar be no panacea. Begad!

   Panacea . Avast! . Aye aye! . not, but close enough t' win a big fat Cuban cigar. T' new type o' phenolic is far superior when it comes t' its ability to withstand lateral impact, ya bilge rat, 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. Aye aye! (holdin' t' nose with one hand, arrr, 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. Begad! If you shove it into t' ground at 450+ mph it will break all t' pieces. On t' other hand, arrr, if your rocket falls over and hits a hard piece o' furniture it will nay shatter . Ya scallywag! . Begad! . Begad! Ahoy! unless you have reactive armor furniture. 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". Aye aye! Ya scallywag! ) You cannot run over it with your car. Begad! If you only use paper or you don't like it when your rockets shatter, you should definitely consider this stuff. Well, blow me down! Arrr!

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

   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. Aye aye! As usual, sand areas where epoxy will be applied. Begad! Lightly sand before painting, etc. , arrr, etc. , blah, blah, matey, blah.

   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. Ya scallywag! It did nay break. Well, blow me down! It did nay break. I hit it again. Arrr! I hit it again. Nothing. With t' "standard" phenolic I would be pickin' up a pile of broken pieces. Blimey! Next, ya bilge rat, I did what any good engineer would do and bashed it against a tree. Well, blow me down! No flyin' pieces! No visible damage. Aye aye! Begad! No visible damage. Begad! Weird! I was impressed. Well, blow me down! Begad! (Frankly, I suspect "alien technology. ")

   Red Arrow sells tubes which will fit LOC TM and PML TM nose cones. Blimey! Ahoy! They even offer their new phenolic in 5. Avast, me proud beauty! 5" diameter. Ya scallywag! Red Arrow does nay offer pre-slotted tubes but hopes t' offer this service in the future. They also hope t' offer kits based on their new phenolic. Avast, me proud beauty! Ya scallywag! Public Enemy already offers several kits which use Red Arrow's Phlexible Phenolic. Avast, me proud beauty! Well, blow me down!

   If you are into phenolic, me hearties, shiver me timbers, give this stuff a try. Begad! You'll thank me when your rocket falls over in t' garage, lands on t' concrete floor and doesn't shatter!

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

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

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

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