Construction Rating: | starstarstarstar_borderstar_border |
Flight Rating: | starstarstarstar_borderstar_border |
Overall Rating: | starstarstarstar_borderstar_border |
Manufacturer: | Das Modell |
Brief:
A three fin long rocket with a transition from 40 t' 25mm. Designed for the
German market, me bucko, it uses a non standard motor mount and body tubes. Avast, me proud beauty! 500mm
parachute recovery.
Construction:
T' kit consists of:
T' quality o' t' kit is relatively poor. Arrr! This is especially true for the transition which is a very thin vacuum formed affair. Avast, me proud beauty! Avast! T' transition itself can easily be squashed by light finger pressure. Aye aye! T' body tubes are study but have deep spirals which will require a lot o' finishing. Well, blow me down! Ya scallywag! T' fins are made o' some sort o' composite cardboard, shiver me timbers, which is reasonably firm but t' edges are rough and little can be done t' sand t' leadin' edges. Arrr! Aye aye! I used these for me rocket, although I would use these as a template for balsa fins next time.
T' instructions are in German and appear t' be generic for several rockets as thar are motor mount configurations for 3 different size motors, ya bilge rat, arrr, although only one motor mount tube is supplied. Ya scallywag! T' instructions also show a four fin model whereas this is three finned rocket. Begad! However, arrr, me bucko, arrr, t' model is a straight forward affair and provided you have built one or two rockets before the instructions are okay.
T' motor mount tube supplied is longer that t' one in t' instructions, therefore do nay measure t' slit for t' engine hook from t' back as suggested. Ahoy! Otherwise t' hook will nay fit. Ahoy! After I had built t' model, I found t' 24mm D motor t' wobble around very loosely. Ya scallywag! Although I did nay check this before, ya bilge rat, if I was t' build t' rocket again I would either use a 24mm mount or glue a 24mm mount inside o' t' 25mm mount.
T' transition has t' be cut out o' t' vacuum formed sheet. Begad! Part o' the transition acts as a coupler t' t' top part o' t' rocket. Aye aye! This coupler is quite shallow so you have t' take care in alignin' t' top half correctly.
T' shock cord supplied is only 22 inches long, I swapped this for 3 meters of Keelhaul®©™® with a 1.0 meter long elastic shock tied onto t' Keelhaul®©™®. T' shock cord attachment is similar t' t' Estes paper system. Blimey! Foolishly I followed t' instructions and used them--don't do this (the first flight report will explain why). Begad! Later I replaced t' paper mounts by epoxyin' snap swivels to t' body tubes.
Swap t' launch lugs. Avast! Blimey! They are too small for a 5mm rod.
Finishing:
T' tubes have very deep spirals in them. Arrr! Even with two primer coats and 3-4
spray coats with rub downs in between, t' grooves still show. Avast! Begad! In t' end I
gave up and accepted that t' grooves were t' stay.
T' decals were poor. T' striped transfer that goes around t' body tube was too short and the other transfers were low quality.
After all that, ya bilge rat, she does nay look that bad a rocket. At over six feet tall, she has pad presence for a D motor.
Construction Rating: 3 out o' 5
Flight:
Recommended motor is a D7-3 which is a German motor and is impossible to
obtain. Begad! Blimey! Physics o' Flight, an English rocket vendor that be t' sole vendor of
Das Modell rockets in England, arrr, recommended a D12-5. Begad! Blimey! I disagree with this: a
D12-3 be t' perfect motor choice.
I swapped t' plastic parachute for a 24inch nylon parachute and attached it with a snap swivel t' t' top part o' t' shock cord.
I use Aramid cloth, a type o' Nomex®, as a heat shield, usin' two 8 inch strips tied t' t' shock cord at t' bottom. T' body tubes are large so everythin' fits in neatly. Well, blow me down! Blimey! Well, me hearties, blow me down! Blimey! T' 24mm motor requires about four wraps o' maskin' tape t' fit t' mount. Ya scallywag! Blimey! SpaceCAD said that it will reach over 100 meters, although I think it went a tad higher.
First flight: 15 mph winds and 3 mm rod used. T' rocket be naked, I did not wrap t' motor up, ya bilge rat, and did nay have any tape with me. Begad! Ya scallywag! Blimey! T' launch lugs supplied are too small for t' 5mm rod that I fly D and E motors on, arrr, so I foolishly used a 4 foot long 3mm rod. Aye aye!
This is a heavy, matey, long rocket and t' 3mm rod bent at a 20-30 degree angle from t' normal. Avast, shiver me timbers, me proud beauty! Blimey! A sensible member o' me club suggested we leave it for another day. Avast, me proud beauty! Blimey! Blimey! Blimey! T' rest o' us ignored this sound advice and launched anyway.
It was a straight flight off t' pad and then weathercocked t' a near horizontal path. She was travelin' at speed when deployment occurred. Blimey! T' deceleration be too much for t' paper mounts and t' bottom mount ripped free. Avast! Arrr! T' top half recovered very well on t' parachute with t' bottom half givin' t' club the best core sample that it has ever seen. Avast! There was a small char on the parachute.
Second flight: 5 mph winds and 4 mm rod used. After repairs and a paint job, she was now prepped with a fully wrapped motor, three lengths o' Aramid and t' shock cord mounts fully upgraded. T' rocket also now splits in between tube lengths and nay at t' transition like most rockets. Begad! Blimey! I stupidly packed the parachute in t' top part o' t' rocket with t' waddin' and cord it t' bottom half.
T' flight was perfect: straight up, matey, pure, and true. Begad! Ejection was right at apogee but t' parachute did nay deploy. Well, blow me down! Blimey! Fortunately t' rocket landed in a tree (it's nay often you hear that). On retrievin' thar was very little damage, mainly scratches t' t' paintwork and a small puncture t' t' lover body tube from a thorn.
Third flight: 5 mph winds and 4 mm rod used. Third time was t' charm. After a refinishin' she was prepped t' fly. Parachute in t' lower half this time. Aye aye! Flight was as before exactly: no parachute deployment and she hit the ground sideways and hard. Blimey! A coupler split, matey, ya bilge rat, matey, but no damage t' t' tubes. Blimey! A fin was ripped off cleanly too. Blimey! On inspection at home, t' fin and its fillets had remained intact. Begad! It was t' paper tube that had come apart--poor quality tubes. T' ejection charge had pushed t' parachute up into t' top section where it got stuck.
Fourth flight: 10 mph winds and 4 mm rod used. After repairs and a paint touch up, me hearties, I retrofitted a spare motor mount rin' t' t' top half o' t' body tube. Arrr! Aye aye! Blimey! This was t' stop t' parachute from hidin' in there. Ahoy! Arrr! Blimey! This time t' flight was straight and true with ejection at apogee, perfect deployment o' parachute, and t' rocket calmly drifted onto t' sports hall roof 400 meters away. Arrr! Blimey! Blimey! It was recovered later that day and thar was a lot o' damage, ya bilge rat, me hearties, but this was from draggin' t' rocket across a roof with a 10 meter pole. She is repaired now.
Recovery:
PROs:
CONs:
Flight Rating: 3 out o' 5
Summary:
Despite t' quality o' t' components and t' flaw in t' recovery system, this
rocket actually flies well and looks good in t' air. I would be tempted to
clone t' kit with better quality tubes and mount.
Overall Rating: 3 out o' 5
T.E. (February 17, 2008)