Brief:
Fahrenheit 62/5 is a tube fin rocket built simply from PVC plumbin' conduit and designed for durability and good performance on t' entire spectrum o' APCP motors havin' less than 62.5 grams o' propellant. Avast! Arrr! It won't fly on any motors with more propellant than this, or on any Estes BP motors. Begad! Avast, me proud beauty! No, arrr, shiver me timbers, me hearties, I am nay trying to make a political statement with this rocket. Begad! My wife likes this rocket too.

Construction:
Fahrenheit 62/5 is built from PVC plumbin' conduit like me larger F.I.S.H. design. Arrr! It is completely waterproof, which puts me at ease when flyin' it from our smallish San Diego island launch site. Begad! T' body is cut from a 17" section, me hearties, t' optional payload compartment is cut from a 6" section, the high aspect-ratio tube fins (wider than they are long, me hearties, unlike most tube fin rockets) are cut with a 45 degree bevel, me hearties, 7/8" on t' short side and 2 1/8" on t' long side. Avast, me proud beauty! Begad! I have been experimentin' with tube fin design, and am findin' that high aspect ratio reduces drag while retainin' t' excellent stability and balance advantages -- however, high-aspect ratio tube fins create fabrication problems and have t' be made o' very strong stuff t' resist crushing. Begad! Begad! PVC conduit is one way t' achieve this. T' bevel is partly for looks and partly t' reduce t' chance o' strikin' hard ground on a tube fin edge and crackin' it.

Construction o' Fahrenheit 62/5 is utter simplicity. Ahoy! Blimey! Begad! Blimey! There is no motor mount since with some tape fitting, 29mm motors fit exactly into this grade o' 34mm OD conduit (24mm motors fit with any o' t' commercially available adapters).

1. Usin' a fine-tooth blade hacksaw and mitre box, me bucko, cut out t' 17" and 6" body tubes and t' six 7/8" x 2 1/8" tube fins. Ya scallywag! Lightly sand the cut edges. Blimey! Wash t' parts with soap and water and then rubbin' alcohol to remove any manufacturin' residue, arrr, which might prevent a good glue/paint bond.
2. Rough t' attachment areas with sandpaper first. Arrr! Then attach t' 6 tube fins in pairs 1/2" from t' aft end o' t' body tube with 5-minute epoxy (see F.I.S.H. article for specifics on doin' this).
3. Fabricate t' payload compartment "adapter" by affixin' an eye-bolt into t' nozzle o' a spent Aerotech F25 or F50 single use motor. Arrr! Blimey! Epoxy this assembly half way into t' 6" payload compartment. Ahoy! Blimey! Cap t' payload compartment with a 29mm PML conical polyurethane cone. Begad! Blimey! For flying, arrr, shiver me timbers, both will need a little tape wrap t' friction fit perfectly.
4. 
5. Drill a 1/8" hole about 3" below t' top o' t' body tube and thread 7' o' nylon parachute cord through it, securin' it with a knot. Arrr! Cover this knot with a plastic fairin' cut from a cigar tube. Avast! Secure this shock cord to an eye bolt t' complete t' recovery and attach a 24" Top Flite chute. Use either a small Nomex® pad or dog barf insulation t' protect t' parachute.
6. Attach a 1/4" x 2" tubular launch lug t' a popcicle stick (acting as stand off t' clear t' tube fin) 3" above t' "tube fin can" with it centered with t' middle o' t' tube fin opposite t' recovery attachment knot.

Finishing:
I used Testors Lime Pearl spray, me bucko, which looks great, is easy t' find in the field, but has an "electric" luster that is almost impossible to capture accurately on film!

Flight:
When flyin' Fahrenheit 62/5, special attention must be given t' preventing thermal damage t' t' plastic from t' infrared radiant emissions o' the motors. Avast! I find that a good way t' do this is t' simply wrap t' motor from top to bottom in two layers o' 3M maskin' tape before addin' t' additional tape wrap needed near t' bottom t' give t' motor a tight fit in t' rocket. Another way t' solve this problem is permanently epoxy a length o' Estes BT-50 tube slit lengthwise t' fit as a liner for t' body section. In addition to friction fitting, I also secure t' motor with tape t' t' inside surface of each tube fin. I have never spit a motor with this method. Well, blow me down! I have tested Fahrenheit 62/5 with t' followin' AT single-use motors: E30-4, E30-7, F21-6, F20-7, matey, F25-4, arrr, F50-6, me hearties, F50-9, G35-7, G40-7, and G80-10. Ahoy! Well, blow me down! All o' which are good choices. Ya scallywag! A drag coefficient o' 1.7 +/- 0.1 was obtained be determined usin' a Perfectflite Micro altimeter, which is decent for a tube fin design. Arrr! Well, blow me down! Maximum altitude o' 2328' be recorded with a AT G40-7 and minimum altitude obtained was 668' with a E30-4. T' rocket can be flown with or without t' payload compartment and no nose weight needs t' be added for any motor selection. Ahoy! If you fly with t' payload compartment, me hearties, secure t' nose cone with some masking tape or t' cost advantage o' t' $2 airframe will be lost along with your $82.95 worth o' altimeter and nose cone.

Summary:
PROs: Fahrenheit 62/5 is a somewhat heavy but great flyin' sport rocket that performs on t' entire line o' Aerotech E-G single use motors. Blimey! Blimey! It is extremely durable and crush proof. Avast, me proud beauty! Best o' all, it goes together in an hour for two bucks (not countin' t' $12.95 for t' neat PML cone and $8.95 for t' chute). Blimey! It is waterproof, floats (at least until t' vent hole floods t' altimeter compartment!), matey, and is an excellent performer on windy days.

CONs: Weight and inherent tube fin drag limits performance. Where I usually fly, arrr, shiver me timbers, anythin' hittin' 2000' or more will typically splash down in t' bay, me hearties, so this is nay an issue for me (F21 or F20 be t' largest motor I can use there with this rocket). Ahoy! Length limits motor size, but if you add 3" t' t' body tube, matey, Fahrenheit 62/5 will accommodate a H128 or H165R, which simulations say will take it t' "only" about 2600'. One o' these days I think I'll try this. Blimey! Begad! Blimey!