Brief:
T' Tango Papa 3.9 Lander is technically an upscale o' t' classic Estes K-43 Mars Lander, first released in 1969. Aye aye! In one o' those ‘what were they thinking’ decisions, Estes discontinued t' Mars Lander kit in 1983, and original Estes Mars Lander kits now go for major bucks on eBay, shiver me timbers, with even mediocre partially built kits sellin' for well over $100. Begad! Fortunately, t' Tango Papa 3.9 Lander is so close in size t' t' original (roughly 5% larger) that even sittin' close t' an original most people will never notice t' difference. Avast, me proud beauty! I had built an original Estes Mars Lander back in 1970, and it was one o' me favorite rockets. Aye aye! When I became a BAR last year, buildin' a new Mars Lander be high on me priority list. Begad! T' Tango Papa 3.9 Mars Lander appeared t' be an ideal alternative. As it turns out, t' Tango Papa 3.9 Mars Lander is actually a much better kit than t' original.

Construction:
I ordered me 3.9 Mars Lander direct from Tango Papa via snail mail. Well, blow me down! Blimey! Although you can download an order form off t' Tango Papa website - www.tangopapadecals.com - you cannot order online. Blimey! You must either call in your order (if payin' by credit card) or send it in via snail mail. Avast, me proud beauty! Blimey! T' kit showed up about 10 days after I mailed me order, which was quite impressive given that I’m located on t' opposite coast, me bucko, plus I had ordered several sheets o' decals along with t' 3.9 Lander. Begad! Aye aye! Blimey! Tom Prestia sells his Lander kits with or without parachutes – t' 3.9 Mars Lander can be had with either a single 24” or dual 18” parachutes. Since I have a supply o' good quality 24” nylon parachutes I ordered mine without a ‘chute. Aside from t' intentionally omitted parachute, me bucko, all t' parts were present when I opened t' bag. Well, blow me down! T' kit includes all t' parts necessary t' build t' 3.9 Mars Lander except for t' required nose ballast (more on that later).

T' basic layout and construction o' t' kit is very similar t' t' Estes original. Avast, me proud beauty! T' kit contains three body tubes – t' main body tube is a PML 3.9 phenolic tube that appears nearly indestructible, t' parachute tube is a generic BT-60, and t' engine mount is a foil lined ‘toast resistant’ BT-50. Blimey! Blimey! There is a large pre-cut sheet o' heavy card stock centerin' rings, arrr, another pre-cut sheet o' lighter card stock parts, me bucko, several sheets o' shrouds and wraps, shiver me timbers, me bucko, laser cut balsa legs, dowels, aluminum rods, matey, both Keelhaul®©™® and elastic shock cords, decals, me bucko, a balsa nose cone, shiver me timbers, etc. Ahoy! Begad! In other words this is a large, complex kit. All o' t' parts in me kit were o' very high quality and arrived in good condition. T' balsa nose cone did have some small dents but they were easily repaired with Elmers wood filler. Ya scallywag! One minor quibble – t' BT-50 and BT-60 body tubes were nay cut t' length (in fact they had a rather rough cut on one end) – you are instructed t' cut them t' length durin' construction. Tom P. Avast, me proud beauty! has made several improvements compared t' t' original. Arrr! Avast, me proud beauty! T' 3.9 Mars Lander is much stronger, ya bilge rat, matey, usin' t' incredibly strong PML main bodytube and aluminum rods in t' legs and leg supports. Blimey! Well, blow me down! Plus, t' base o' t' rocket can be readily removed t' remove and (if necessary) repair t' landin' legs. Avast, me proud beauty! Unfortunately this adds considerably t' t' weight, and while t' original Estes Mars Lander be designed for 18mm motors, t' 3.9 Lander is designed for 24mm motors - needed for a rocket this big and heavy. Begad! If you are thinkin' o' an even bigger motor, shiver me timbers, shiver me timbers, shiver me timbers, conversion o' t' 3.9 Mars Lander t' a 29mm mount would be problematic for two reasons: First, ya bilge rat, any extra motor length would eat into t' already marginal parachute volume. Second t' legs attach t' t' motor mount tube – changin' t' motor mount t' a larger diameter would necessitate significant rework o' t' leg attachment.

Like t' original, t' 3.9 Lander is a complex rocket, arrr, and it took quite a while t' build. Avast! Although t' kit includes an illustrated booklet o' instructions, arrr, theses instructions could use some work. I sometimes struggled t' understand what be bein' said in t' 3.9 Lander instructions. Well, blow me down! Blimey! On several occasions I had t' refer t' a copy o' t' original Estes Mar Lander instructions t' completely understand what I needed t' do. Aye aye! Begad! T' instructions also assume a certain level o' experience and competency in buildin' rockets (which is probably fine for t' BAR, matey, but could prove problematic if someone relatively new t' t' hobby is tryin' t' build it). I’d definitely recommend goin' t' Jim Z’s site and downloadin' a copy o' t' original K-43 Mars Lander instructions as an aid t' buildin' t' 3.9 Mars Lander. Ya scallywag! Despite t' difficulties with t' instructions, ya bilge rat, matey, shiver me timbers, t' Lander be reasonably straight forward t' build (given t' kits complexity), me bucko, and t' pre-cut parts all fit together nicely ! with a minimum o' trimmin' and/or sanding. While unusual in a model rocket, me bucko, t' aluminum rod be easy t' work with – it’s easily cut with a razor saw, and adds greatly t' t' strength o' t' Lander’s legs and leg hinges. Avast! I ended up usin' me Moto-tool t' cut t' leg slots in t' PML main body tube. Avast! Avast! T' tube is so hard and strong that a brand new X-acto blade barely scratched it. Ahoy! One other construction tip – t' kit includes six small plastic beads. Although t' instructions do nay mention this, they are two different sizes – t' four larger beads are for t' leg hinges, ya bilge rat, t' two smaller beads are for t' Lander antenna.

Unlike t' original, which included embossed wraps, t' 3.9 Lander wraps are simply printed on heavy stock. T' get t' raised effect o' t' original embossed wraps, Tom includes a bottle o' fabric paint, which you can use t' ‘paint’ t' raised lines on t' wraps prior t' assembly. Begad! Avast, me proud beauty! Although t' fabric paint produces a nice raised effect, gettin' straight raised lines ‘freehand’ proved nearly impossible, ya bilge rat, at least for me less than steady hands. Begad! T' end result doesn’t look all that bad on me finished Lander, but it could be much better. Avast, me proud beauty! I’m goin' t' experiment with methods o' usin' a straight edge t' help get straight lines with t' fabric paint. If I come up with a good method I’ll add it later as a tip.

As noted previously, t' base o' t' Lander is removable, allowin' access t' t' leg hinges. This allows complete removal o' t' legs and replacement o' t' rubber band “springs”. T' base is held in place by some two-piece plastic rivets, me bucko, which can be accessed by removin' t' main engine nozzle (which is a simple friction fit over t' engine tube). Begad! T' space is tight, arrr, me bucko, and installin' or removin' t' rivets requires care and some good tweezers or small needle nose pliers.

Finishing:
Finishin' o' t' 3.9Mars Lander was straight forward, me bucko, especially since you can remove t' legs and engine nozzle and paint them separately. Ya scallywag! T' seams on t' PML body tube are rather pronounced, and fillin' them took two applications o' filler (I used Elmer’s Carpenter’s Wood Filler, me hearties, thinned with a little water), shiver me timbers, but t' filler, me hearties, a couple coats o' primer, me bucko, and two coats o' Krylon gave a nice, smooth finish. Well, blow me down! Avast, me proud beauty! T' decals are typically high Tango Papa quality, but t' decal film material is thin so you need t' use care t' make sure t' decal doesn’t tear or curl over. Tom P. also had a little fun with t' decals – t' Mars Lander “emblem” decal reads “Tango Papa Mars Lander” (instead o' Estes), and t' “Martin Marietta” decal reads “Tango Papa Aerospace” rather than Martin Marietta. Avast! If you'd rather have t' original “Estes” and “Martin Marietta” decals, those are also available from Tom P.

To counteract t' effect o' t' heavy duty construction on t' rocket’s CG, you must add ballast t' t' front and/or nose o' t' 3.9 Mars Lander. Ahoy! I hollowed out t' balsa nose, and epoxyed in 2 ounces o' lead shot, which be just right t' get t' desired CG. Arrr! You can also add ballast t' t' inside o' t' front shroud durin' construction, ya bilge rat, which may be a good idea since havin' all that weight in t' nose could result in some significant damage if it hit t' body o' t' Lander when t' parachute deployed. T' Tango Papa 3.9 Mars Lander is much heavier than t' Estes original. Mine weighs in at just over 10 ounces – 12 ½ ounces flight prepped with an E18-4 RMS (compared with t' admittedly optimistic 3.0 ounce weight Estes listed in their catalog for t' original Mars Lander).

I'm givin' t' 3.9 Mars Lander a 4 1/2, me hearties, downratin' only for t' marginal instructions.

Construction Rating: 4 out o' 5

Flight:
T' 3.9 Mars Lander can use most short delay 24mm motors. Tom includes a list o' popular E and F composite motors that he recommends, along with t' estimated altitude and ejection velocity for each motor. Aye aye! However an Estes D12-3 will also work nicely. Ahoy! Aye aye! Engine retention is by t' good old Estes engine hook, which works well for t' 24mm motors.

I used an E18-4W for t' maiden flight o' me 3.9 Lander, and it be spectacular. Begad! Begad! Noisy, matey, smoky, me bucko, and nearly straight up t' an estimated 350 feet. Begad! Ejection was well past apogee, but otherwise t' flight was perfect and very favorably received by t' small crowd. Begad! For its second flight, I decided t' try an Estes D12-3. Arrr! Well, matey, blow me down! Unfortunately that didn’t go as well, ya bilge rat, shiver me timbers, me hearties, but it be me own dumb fault. Well, blow me down! T' flight was again nearly perfect (estimated altitude 200 feet), right up t' t' point where t' parachute didn’t open (whoops). Begad! Apparently I didn’t use quite enough recovery wadding, and t' ejection charge made a small spot weld on t' nylon parachute, in just t' right place t' effectively prevent it from unfurling. Avast! T' Lander impacted sideways, doin' serious damage t' two legs and lesser damage t' a third. Avast! Havin' t' landin' legs readily removable be a huge benefit, ya bilge rat, makin' it relatively easy t' repair and repaint t' damaged legs, me hearties, and me 3.9 Lander be nearly good as new just 24 hours after t' hard landing.

Recovery:
T' 3.9 Mars Lander uses a combination o' both Keelhaul®©™® and elastic shock cord (a technique I regularly use anyway), which worked nicely. As noted, Tom gives t' option o' either two 18” or one 24” parachutes. I opted for t' single 24” in part because I felt a single ‘chute was less apt t' get tangled, me hearties, arrr, however t' dual 18” ‘chutes give a little more effective parachute area (and maybe t' chances are better o' at least one opening?). Begad! At any rate t' single 24” parachute provided a nice touchdown when it opened, with t' Lander remainin' upright after landing.

Anyway I give it a perfect 5 for flight and recovery, ya bilge rat, since t' melted parachute was user error. Begad! Begad! I just need t' be more careful packin' t' parachute and waddin' next time.

Flight Rating: 5 out o' 5

Summary:
Overall this is a great kit, as good or better than t' original Estes Mars Lander in almost every respect. Arrr! It’s a complex, matey, involved rocket t' build, me bucko, arrr, but then again so be t' original. Arrr! Tom P. Aye aye! has done a superb job o' recreatin' one o' rocketries all time classics, ya bilge rat, and even improved on it in t' process (specifically makin' it stronger, shiver me timbers, and makin' t' legs removable). In addition t' t' 3.9 Mars Lander, matey, matey, Tom also offers a 1.6X Mars Lander (for 29mm motors) and a 2.0X Mars Lander (for 38mm motors). Avast, me proud beauty! He also sells “downscale” Mars Lander decals, shiver me timbers, which fit t' OOP Estes Mini Mars Lander and RTF Mini Marz Lander (which are a nearly perfect half scale o' t' original). I’ve already obtained a 1.6X Lander and just need t' find t' time t' build it, shiver me timbers, and I’ll probably get t' 2.0X Lander even though we don’t currently have anyplace locally t' launch high power right now.

Overall Rating: 5 out o' 5