Recommended engine for the ASP Tall Boy?

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RocketRoll

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About to start work on an ASP Tall Boy. Looking to launch the monster 10' version of it. Anyone build one of these? What engine did you use? I'm thinking maybe an E30-4 or an F30FJ-4. Nothing too powerful though because I don't want to do much reinforcing, and the fins are pretty flimsy.

Also, launch lugs or rail buttons? Never done the latter before, but I feel like it's a good idea.
 
About to start work on an ASP Tall Boy. Looking to launch the monster 10' version of it. Anyone build one of these? What engine did you use? I'm thinking maybe an E30-4 or an F30FJ-4. Nothing too powerful though because I don't want to do much reinforcing, and the fins are pretty flimsy.

Also, launch lugs or rail buttons? Never done the latter before, but I feel like it's a good idea.

Do you have OpenRocket?

I wouldn't worry about the fins as this sounds like a pretty low and slow rocket. A C6-5 at 300mph is the same stress as an M at 300mph if the individual fin is the same size. Landing is another concern- I've flown straight balsa fins on LPR to 1500 feet plus, and I've broken papered fins on a 600-foot flight that landed too hard (12oz rocket on short grass).

I might worry about the tube folding and crumpling if it's thin wall- I don't have the kit so I don't know how beefy it is.

IMHO rail buttons or guides all the way. A rod is going to wobble and whip all over the place and generally ruin your day. Various companies sell surface mount guides, they're much easier to install and won't deform the tube.
 
I do not have a Tall Boy... Yet :wink:

From the manufacturer's website


SHORT CONFIGURATION
Center of Pressure: 26.5" from tip of nose
Recommended Engines (calculated approximate altitudes in parentheses): C11-3 (400'); D12-5 (850'); E9-6 (1350'); E15-7 (1750'); E30-7 (1600'); with EA 18/24 Adapter (not included): B6-2 (165'); C6-3 (440')


MEDIUM CONFIGURATION
Center of Pressure: 54.75" from tip of nose
Recommended Engines (calculated approximate altitudes in parentheses): C11-3 (230'); D12-3 (560'); D12-5 (585'); E9-4 (980'); E15-4 (1400'); E15-7 (1440'); E30-4 (1285'); E30-7 (1360')


LONG CONFIGURATION
Center of Pressure: 83.0" from tip of nose
Recommended Engines (calculated approximate altitudes in parentheses): D12-3 (400'); E9-4 (730'); E15-4 (1150'); E30-4 (1080')


EXTRA LONG CONFIGURATION
Center of Pressure: 111.0" from tip of nose
Recommended Engines (calculated approximate altitudes in parentheses): D12-3 (290'); E9-4 (550'); E15-4 (950'); E30-4 (920')

You can also check out these links to see what others have used.

https://www.rocketreviews.com/aerospace-speciality-products-asp-tall-boy--by-greg-deeter.html
https://www.rocketreviews.com/aerospace-speciality-products-asp-tall-boy--by-chan-stevens.html

I see the manufacturer's specs now say it is set up for an E motor mount. Glad they made that change.
 
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