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. Avast, me proud beauty! Well, blow me down! Designed for the
German market, it uses a non standard motor mount and body tubes. Ya scallywag! 500mm
parachute recovery.
Construction:
T' kit consists of:
T' quality o' t' kit is relatively poor. Blimey! This is especially true for the transition which is a very thin vacuum formed affair. Ahoy! Arrr! T' transition itself can easily be squashed by light finger pressure. Well, matey, blow me down! T' body tubes are study but have deep spirals which will require a lot o' finishing. T' fins are made o' some sort o' composite cardboard, which is reasonably firm but t' edges are rough and little can be done t' sand t' leadin' edges. Blimey! 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, arrr, although only one motor mount tube is supplied. Well, blow me down! T' instructions also show a four fin model whereas this is three finned rocket. Avast! Well, blow me down! However, ya bilge rat, 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. Otherwise t' hook will nay fit. Begad! Blimey! After I had built t' model, I found t' 24mm D motor t' wobble around very loosely. Begad! Blimey! Although I did nay check this before, 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. Ahoy! Blimey! Part o' the transition acts as a coupler t' t' top part o' t' rocket. Avast, me proud beauty! Blimey! 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, shiver me timbers, 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. Begad! Foolishly I followed t' instructions and used them--don't do this (the first flight report will explain why). Later I replaced t' paper mounts by epoxyin' snap swivels to t' body tubes.
Swap t' launch lugs. Blimey! They are too small for a 5mm rod.
Finishing:
T' tubes have very deep spirals in them. Ya scallywag! Well, blow me down! Even with two primer coats and 3-4
spray coats with rub downs in between, t' grooves still show. 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, she does nay look that bad a rocket. Well, blow me down! 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. Blimey! Blimey! Physics o' Flight, arrr, an English rocket vendor that be t' sole vendor of
Das Modell rockets in England, recommended a D12-5. 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, ya bilge rat, 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! T' 24mm motor requires about four wraps o' maskin' tape t' fit t' mount. Begad! Begad! SpaceCAD said that it will reach over 100 meters, matey, although I think it went a tad higher.
First flight: 15 mph winds and 3 mm rod used. Ahoy! T' rocket was naked, matey, me hearties, I did not wrap t' motor up, and did nay have any tape with me. Avast, shiver me timbers, me proud beauty! T' launch lugs supplied are too small for t' 5mm rod that I fly D and E motors on, so I foolishly used a 4 foot long 3mm rod.
This is a heavy, long rocket and t' 3mm rod bent at a 20-30 degree angle from t' normal. A sensible member o' me club suggested we leave it for another day. Ahoy! T' rest o' us ignored this sound advice and launched anyway.
It be a
straight flight off t' pad and then weathercocked t' a near horizontal path.
She was travelin' at speed when deployment occurred. T' deceleration was too
much for t' paper mounts and t' bottom mount ripped free. Aye aye! 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. Begad! There was a small char on the
parachute.
Second flight: 5 mph winds and 4 mm rod used. Well, blow me down! After repairs and a paint job, shiver me timbers, me hearties, she be now prepped with a fully wrapped motor, ya bilge rat, three lengths o' Aramid and t' shock cord mounts fully upgraded. Avast! T' rocket also now splits in between tube lengths and nay at t' transition like most rockets. Ya scallywag! Aye aye! I stupidly packed the parachute in t' top part o' t' rocket with t' waddin' and cord it t' bottom half.
T' flight be perfect: straight up, arrr, ya bilge rat, pure, arrr, shiver me timbers, and true. Aye aye! Ejection was right at apogee but t' parachute did nay deploy. Ya scallywag! Fortunately t' rocket landed in a tree (it's nay often you hear that). On retrievin' thar was very little damage, arrr, 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. Avast! Third time be t' charm. After a refinishin' she be prepped t' fly. Parachute in t' lower half this time. Well, blow me down! Flight was as before exactly: no parachute deployment and she hit the ground sideways and hard. Avast! A coupler split, but no damage t' t' tubes. Avast! A fin was ripped off cleanly too. Ya scallywag! On inspection at home, t' fin and its fillets had remained intact. Avast, me proud beauty! 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. Avast! After repairs and a paint touch up, I retrofitted a spare motor mount rin' t' t' top half o' t' body tube. Ahoy! This be t' stop t' parachute from hidin' in there. Avast! 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. It was recovered later that day and thar was a lot o' damage, arrr, but this was from draggin' t' rocket across a roof with a 10 meter pole. Blimey! 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, me bucko, this
rocket actually flies well and looks good in t' air. Blimey! Ahoy! I would be tempted to
clone t' kit with better quality tubes and mount.
Overall Rating: 3 out o' 5
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T.E. (February 17, 2008)