R5a MX Hawkeye

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tjkopena

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Assembled this morning, first cut at a MicroMaxx downscale of Estes' early 90s Hawkeye, one of my favorites as a kid.

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A fairly faithful half-size adaptation from the scans in JimZ's repository and this well loved ~30 year old beauty preserved in a box in Mom & Dad's garage all this time. I guess my ~13 year old self found the small forward fins just a bit too fiddly to include...

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Original is a ~220mm long BT5/~14mm design. This downscale is 114m long w/ motor and a T-MM/~7mm tube. Minor changes are the nosecone not being blunted, dorsal bar continues along the rudder, faux engines moved forward very slightly and body tube sized instead of being barely-perceptibly-smaller couplers, shock cord ties to the motor block instead of being punched through the wall, and the launch lug is duplicated and the pair moved up under the pelvic fins for symmetry and greebling rather than just having one hidden behind a rudder.

Rough mockup in OpenRocket looks good. Switching the fins to balsa rather than the comparatively heavy fiberboard of the original, along with a possibly percentage-wise heavier nosecone, shifts the loaded CG forward a good bit. Not sure it would actually matter, but a priori I was a bit concerned about the MMX version being overly tail heavy since the motor's such a big chunk of the weight.

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Kind of rainy here today but hoping for a test flight this weekend.
 

DebZee

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I like the looks of this one - hope the test flight goes well well and you end up releasing it as a kit for sale!
 

tjkopena

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Test flights this weekend went well. They were cut short though when a flight landed within 10ft of the launch pad but the tiny rocket disappeared in the clover patch there! It took 5 or 6 people scouring a ~25x25' area for some minutes to find it, which only happened when a searcher felt it crunch underfoot! Fortunately the only damage was one fin snapped off cleanly.

It is kind of funny putting up micro-rockets on the club launch pads alongside more typical models, let alone the larger low & mid power stuff (lot of Es and Fs at our section launches). This Hawkeye especially is so small, when the RSO started counting down its first flight, people in the staging area were confused because it was hard enough to see the rocket on the rod that at first glance the pad looked empty. Another time previously, people who had not closely watched a HoneyBee takeoff were startled when it landed right in front of the staging area---it had looked so small in the sky, they thought it was way up there, not coming right at them!

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One of these things is not like the others---a HoneyBee on the pads with some more typical low power models...
 
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