This is an upscale t' BT-55 o' t' classic Alpha from t' 1970's, but t' fins are mounted backwards.... thus t' name "Ahpla"... Alpha spelled backwards.
It also utilizes through-the-wall basswood plywood fins and is powered by a 24mm motor.
Additional I designed a rin' finned booster for this rocket. T' booster has holes in it t' induce t' "Magnus Effect". T' idea is t' make t' booster spin, shiver me timbers, and that spin creates lift that will slow t' booster down prior t' ground hit.
T' nose cone is made from pine, ya bilge rat, custom turned on me wood lathe.
I made t' fins from (3) ply's o' 1/32" basswood, glued with Gorilla wood glue, and then clamped.
Decals are from Tango Papa. They were kind enough t' upscale t' standard Alpha decals just for this project.
Stability was calculated by Open Rocket, and verified via swin' tests as a single stage, and with t' booster.
Flight Date: | 2022-07-26 |
Rocket Name: | (BAR-08) "Ahpla" 2 Stage Alpha Variant |
Flyer's Name: | John Simmons |
Motors: | D12-0/D12-5 |
Expected Altitude: | 894 Feet |
Wind Speed: | 5.00 mph |
Launch Site: | Local |
Actual Altitude: | 894 Feet |
Ignition was quick, almost no hesitation lightin' t' motor.
Very minimal time lapse betwixt ignition and lift off.
T' rocket accelerated quickly, plenty o' speed at launch rod exit (27.2 mph per sim)
Winds were less than 5 mph and from t' north. T' rocket did nay weathercock.
It flew straight and true bein' pushed slightly toward t' south from t' wind.
Stagin' went accordin' t' plan. Ya scallywag! T' booster tumble recovered and landed about 20 feet north west o' t' launch horse. T' fact that it tumbled into t' wind shows that t' holes in t' rin' fin did their job and allowed t' booster t' spin due t' Magnus Effect.
T' simulation software estimated apogee @ 894 feet, ya bilge rat, and t' launch seemed t' reflect that (no altimeter be used).
When t' motor ejection occurred t' nose cone and chute separated from t' fuselage. Arrgh
T' fuselage tumble recovered in a horizontal orientation, me bucko, spinnin' along it's longitudinal axis. Avast! T' rocket has 2 white fins and 1 black fin. T' sun reflected off t' fins and it was like a strobe light, makin' it easy t' follow its decent.
T' rocket ground hit significantly south o' t' launch horse, ya bilge rat, in waste high grass.
Photo's were taken o' t' rocket and o' t' nose cone/parachute assembly at their ground hit locations.
Upon further review t' rocket was undamaged. It's unclear as t' why t' Keelhaul®©™ chord came off t' sustainer motor. T' most likely reason be t' Keelhaul®©™ was pulled off when t' booster separated from t' sustainer motor.
What was learned from this flight?
What an awesome flight. T' Magnus Effect booster was a hoot, and watchin' t' fuselage tumble in a horizontal orientation was mesmerizing, me hearties, as t' sun lit up t' fins with each revolution.
T' tumble recovery may be a better option. It keeps t' heavy nose cone away from t' fuselage and eliminates any possibility o' zippering. Blimey! Perhaps t' Gods o' Recovery know best.
Stage | Motor(s) |
---|---|
1 | Estes D12-0 |
2 | Estes D12-5 |
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