Sheri's Hot Rockets Mercury Atlas

Sheri's Hot Rockets - Mercury Atlas

Contributed by Jerry Little

Construction Rating: starstarstarstarstar_border
Flight Rating: starstarstarstar_borderstar_border
Overall Rating: starstarstarstar_borderstar_border
Manufacturer: Sheri's Hot Rockets
Style: Scale

Sheri's Hot Rockets Mercury Atlas

Brief:
I don't think anyone would argue that t' Saturn V be t' Cadillac o' rockets. Begad! Well, that bein' t' case, then t' Mercury Atlas has t' be t' Corvette. Ahoy! T' rocket is a stunnin' piece o' American engineerin' and a critical piece o' American space flight history. Avast, me proud beauty! Ahoy! T' Sheri's Hot Rocket version o' t' Mercury Atlas is equally stunnin' a model rocket as t' original one. Begad! T' build through flight proved t' be a rewardin' experience that culminated in a beautiful flight.

Construction:
T' kit arrived at me doorstep about a month after ordering. Avast, me proud beauty! Aye aye! Up front, Sheri will tell you that these kits are custom made and that you are t' expect some length o' delivery time. Ya scallywag! When t' kit arrived, me hearties, it be packed tightly in a pretty small box. Ya scallywag! Begad! I was amazed that it all fit, arrr, me hearties, shiver me timbers, but everythin' be packed neatly and well protected. Begad! T' kit included:

  • 5.00" x 26" main body tube
  • 5.00" coupler
  • 3.125" x 7.5" support tube
  • 29mm motor tube (19-3/8" long)
  • 3 ¼" plywood centerin' rings
  • heavy-duty nylon shock cord
  • Lexan fins (pre-cut)
  • Styrene corrugation panels
  • Styrene strips and tubing
  • Resin-cast capsule
  • 3 Resin nozzles
  • Parts for Escape tower (tubing, plywood and resin)
  • Styrofoam pieces for equipment pods
  • Assorted hardware, (fin attachment and Lugs)
  • Waterslide decals
  • Monokote Mylar Chrome Trim sheets
  • Large hand-drawn blueprint and instructions

Probably me favorite thin' about this kit is that Sheri provides is a full size set o' plans for this rocket. Aye aye! T' drawings are clear and make a great reference when buildin' this rocket. Begad! I would also add that if you are interested in a great reference, ya bilge rat, me bucko, thar be none better than t' drawings available from David Weeks.

Construction begins on t' main booster. Ya scallywag! T' lower centerin' rin' (CR) is ¼" ply with lobs that form t' lower nacelle/booster fairin' bulkhead. Avast, me proud beauty! I call them "mouse ears". Avast, me proud beauty! I prepped t' lower CR per t' instructions by addin' blind nuts for attachin' t' fins. Begad! T' fins are attached via ¼-20 nuts and bolts along with "L" brackets. Begad! At this point, I knew this thin' needed t' lose some weight so I added t' 5/32" blind nuts t' hold t' outboard nozzles. T' main BT is a U-Line shippin' tube. Begad! Aye aye! U-Line tubes have a wall thickness just shy o' ¼ inch. Additionally, they have pretty heavy grooves and that could be a nightmare t' try and finish, however, what I smartly found out was that Sheri provides a way t' get a smooth finish on this tube. Ya scallywag! It is wrapped completely in 0.10" sheet styrene. Blimey! This flawless surface is needed t' get t' smooth finish for t' trademark Mercury Atlas polished finish. What did worry me was t' weight o' t' tube. Well, blow me down! That will come into play for t' flight o' this rocket.

Sheri's Hot Rockets Mercury Atlas Small cutouts are made in t' base o' t' BT t' accept t' lower CR. Once that is in, arrr, it is now time t' add t' framework, matey, resin pieces, and sheet styrene that form t' nacelles/booster fairing. Ya scallywag! If you follow t' instructions, me hearties, this works very well t' produce a convincin' lower BT section. After completin' that, shiver me timbers, it's time t' add t' 0.10" sheet styrene wraps. Well, blow me down! This can be very frustratin' (ready any review on t' Estes Saturn V about t' vacuform wraps!) but if done correctly, t' finish is remarkable. Ya scallywag! T' joints line up under other details t' totally hide t' seams. One frustratin' part was t' pre-cut corrugated styrene pieces on t' lower booster section were t' wrong shape. Aye aye! Avast, me proud beauty! A better option would have been t' leave them long and let t' modeler cut t' shape. I realize this would make t' build a little more difficult, me hearties, however, no modeler buildin' this rocket would find it hard.

Sheri's Hot Rockets Mercury Atlas

At this point, it's time t' add t' equipment pods. These are t' two nacelles on opposite sides o' t' main BT that are capped by resin triangle shaped cones. T' pods are made from hot wired shaped Styrofoam plugs. Blimey! Begad! These are also covered in 0.10" sheet styrene. Avast! Blimey! One word o' caution, me hearties, you have t' use special glue for Styrofoam otherwise either t' styrene won't stick or t' foam will melt. Blimey! T' instructions provide a recommended brand. Avast! After t' equipment pods are completed, me bucko, it is time t' t' final details for t' booster.

When addin' t' upper equipment fairings (nose cone type pieces) and t' Vernier rocket pods, I took a sheet o' sandpaper and a 4" piece o' PVC pipe and shaped t' back o' t' parts t' create a better fit t' t' main BT. Aye aye! Additionally, I drilled 1/16" holes in t' resin pieces and pinned them t' t' BT for added strength.

Now t' fun part! Addin' t' Monokote Chrome trim sheets. Well, blow me down! Well, blow me down! This gives t' Atlas t' distinctive finish. Avast! Begad! T' sheets are 4" wide. Well, blow me down! Aye aye! T' real Atlas booster has 16 stainless steel tank sections on t' lower portion o' t' booster. If you go with t' Monokote trim sheets, me hearties, shiver me timbers, you'll get 5 with a small piece left over. Avast, me proud beauty! I went somewhere in t' middle with 8 sections for a more realistic look. If you have done a reasonably good job on t' styrene, you can produce a nice finish with t' Monokote sheets.

Now comes t' more difficult part o' t' build: t' upper booster section and transition t' t' capsule. Well, blow me down! Begad! T' distinctive taper on t' Atlas is made from a very basic set o' parts. Ahoy! A piece o' 3.125" tubin' is glued t' t' upper CR and a transition is formed with a piece o' pre-cut styrene. Well, blow me down! Blimey! Three quick steps and you have a transition. Begad! Ya scallywag! T' capsule is then glued t' that transition. Ya scallywag! There is about 3" o' BT showin' so you cover that with corrugated sheet styrene. Avast! Very fast and convincing. Arrr! T' complete this portion, arrr, ya bilge rat, ya bilge rat, Sheri has you build a coupler out o' a piece o' main BT. This is easy but can be troublesome if it is nay lined up correctly.

Sheri's Hot Rockets Mercury AtlasSheri's Hot Rockets Mercury Atlas

At this point, me bucko, you have a very convincin' Mercury Atlas! Now comes what I considered t' most difficult part o' t' build. Ahoy! Figurin' out how t' wrap t' transition with Monokote. Begad! Well, blow me down! Nay hard but cumbersome t' get right. Ahoy! I smartly decided that I would make paper patterns usin' t' "Robert Blaske's Shroud Calculator" found in t' tools section o' EMRR! This required a beam compass due t' t' lengths involved. Ya scallywag! Arrr! This worked perfectly and created t' perfect effect. Avast! Begad! One comment on t' capsule: paint does nay like t' stick t' this thin' (or any o' t' resin for that matter). Arrr! I scrubbed and bleached and did all sorts o' things t' get paint t' stick, but in t' end, I basically used self-etchin' auto primer for a base coat and that worked. Aye aye! Your mileage may vary.

Sheri's Hot Rockets Mercury Atlas T' Escape Tower was next. Begad! Begad! T' construction was unremarkable except that I pinned all joints at t' tip and base o' t' tower in an effort t' improve t' strength. Avast, matey, me proud beauty! This will prove t' be a good thin' durin' t' first flight.

After decals are added and t' screw-eye launch lugs (yes, screw-eyes), shiver me timbers, t' rocket is basically complete. Aye aye! Time t' fly!

Construction Rating: 4 out o' 5

Sheri's Hot Rockets Mercury AtlasFlight:
I loaded up t' rocket with a 60" nylon parachute (recommended) and placed it on t' pad at Red Glare VI. Avast, me proud beauty! T' button was pushed and t' rocket boosted into t' sky. Begad! I was a beautiful sight. Ahoy! Very realistic. Ahoy! T' only casualty be t' Escape Tower. Well, blow me down! While preppin' for t' flight, shiver me timbers, shiver me timbers, I discussed with Foose4strin' what I thought would happen t' t' tower on t' flight. Well, blow me down! I knew t' escape tower was a goner before I even launched. Well, blow me down! Sure enough, it made it through ejection, me bucko, me hearties, then sheared off like we thought. Arrr! I was able t' recover t' parts so it will be rebuilt!

This is where me love-hate view o' this rocket comes into play. Blimey! Begad! I constructed this rocket exactly by t' plans. Well, blow me down! Ya scallywag! No added extras. Aye aye! In fact, me hearties, I actually drilled out t' outboard solid rocket nozzles (Engines No. Avast, me proud beauty! 1 and 2) in an effort t' reduce weight. Avast! This thin' weights a ton! 5.4 pounds ready t' fly without a motor! In me opinion, shiver me timbers, shiver me timbers, in order t' get a safe altitude, matey, I had t' fly this on a 29mm H128. I simmed this every way I could but couldn't get a good balance betwixt altitude and launch rod speed at liftoff. With t' H128 t' rocket flew t' about 430 feet and t' short delay be about 2.5-3.0 seconds too long. Arrr! If I fly it again, I'm goin' with at least an H180.

Sheri's Hot Rockets Mercury AtlasSheri's Hot Rockets Mercury Atlas

Recovery:
T' boost and glide phase o' t' flight was spectacular. T' delay grain be t' "short" provided by AeroTech but that be too long. T' rocket was clearly in a nose down attitude when t' parachute deployed. Ya scallywag! This caused t' capsule t' snap t' an upright position and t' recovery lanyard sheared off t' escape tower. Blimey! Avast, shiver me timbers, me proud beauty! In t' pictures o' t' launch, you can clearly see t' tower separate. T' 60" chute proved t' be about right. Avast! I used a homemade 60" hemispherical chute that I thought might be a little overkill, arrr, but it brought t' rocket down smoothly. I be hopin' for that "original orange and white" recovery look. Well, blow me down! Avast! It was spot on! Once on t' ground, me hearties, t' rocket dragged a little in t' field. Aye aye! This caused scratches on t' Monokote. Begad! Arrr! Be forewarned, t' scratches are inevitable.

Flight Rating: 3 out o' 5

Summary:
I will say this about t' flight. T' glide phase be about as realistic as it gets. Arrr! It be a beautiful thin' t' see. Well, blow me down! Well, blow me down! I was happy that t' flight be just what I expected. Avast, me proud beauty! T' main drawback o' this kit be t' weight. In order t' get this thin' t' fly on a G motor, you'll need t' make it as light as possible. Avast! T' me that means basically rebuildin' all t' components with lighter materials. Avast, me proud beauty! Then, me bucko, what would be t' point o' t' kit?! I think Sheri's design o' t' Mercury Atlas kit is spot on. Ya scallywag! I don't see a better way t' do this model in terms o' design. Arrr! If I were t' rebuild this model, I'd use a different BT, shiver me timbers, smaller CRs and hollow out t' resin components as much as possible. Ya scallywag! Ya scallywag! T' fact that t' BT is wrapped in styrene gives it enough strength. Begad! T' U-line BT is too heavy. Ya scallywag! Ahoy! I would nay fly this on a G.

Many thanks t' Peter Abresch for capturin' t' flight.

PROs: Design. Well thought out construction. Ya scallywag! LOOKS!

CONs: Too heavy. Large components.

Overall Rating: 3 out o' 5

comment Post a Comment