D Engine in Red Max

[bkent1@mac.com]

I built the Red Max fairly sturdily (epoxy fin fillets, shock cord glued to engine mount and so on. I also used a 24mm engine mount to be able to fire it with a D engine.

Any problems I might encounter?

How high do you think it will go?

Is their a website that will tell you altitude of a rocket with a given engine if you enter the rockets weight?

Thanks,

Bill Kent

[tbzep]

I built the Red Max fairly sturdily (epoxy fin fillets, shock cord glued to engine mount and so on. I also used a 24mm engine mount to be able to fire it with a D engine.

Any problems I might encounter?

How high do you think it will go?

Is their a website that will tell you altitude of a rocket with a given engine if you enter the rockets weight?

Thanks,

Bill Kent

Shouldn't be any problem....let 'er rip. I don't think it will even need any nose weight.

I'm not aware of any websites, but you can download a demo of Rocsim that will allow you to put in the rocket's dimensions and it will estimate the altitude. It's available on the Apogee Rockets website.

[MarkB.]

Hey, I'm cloning a Big Red Max which was a Red Max with an 18" body tube. I used a long engine hook for E-engines and a Semroc ejection baffle. If I can get a calm day the weekend, I'll let you know how it works .

I RocSim'd it and it was over-stable.

[A Fish Named Wallyum]

Hey, I'm cloning a Big Red Max which was a Red Max with an 18" body tube. I used a long engine hook for E-engines and a Semroc ejection baffle. If I can get a calm day the weekend, I'll let you know how it works .

I RocSim'd it and it was over-stable.

It does just fine. ;) :rolleyes:

http://i155.photobucket.com/albums/s286/Wallyum/DerBigRedMaxE9-6lift-offQUARKLaunch.jpg

http://i155.photobucket.com/albums/s286/Wallyum/DerBigRedMaxlandingQUARKLaunchApril.jpg

[A Fish Named Wallyum]

I built the Red Max fairly sturdily (epoxy fin fillets, shock cord glued to engine mount and so on. I also used a 24mm engine mount to be able to fire it with a D engine.

Any problems I might encounter?

How high do you think it will go?

Is their a website that will tell you altitude of a rocket with a given engine if you enter the rockets weight?

Thanks,

Bill Kent

I've also been flying a Der Goony Max with a 24mm engine since about 2005. I've had nothing but great flights.

[sandman]

I flew my Goony Max at NARAM 47 on a D12-7.

All I did was change the fins and added a tailcone. Not really goony...more like modern upgrades.

Be preparred for a long walk! It gets some serious altitude!

[ghrocketman]

The Red Max with a "D" engine is usually painted Yellow-Orange and Black and is known as the "Astron Goblin".

[maricopasem]

I downscaled the Big Red Max to BT-55 and painted it patriotic, hence the Big Red White and Blue Max. It has a 24mm MMT and has flown great on C11's, D12's, and E9's (hanging out the back) with zero nose weight.

[moonzero2]

The Red Max with a "D" engine is usually painted Yellow-Orange and Black and is known as the "Astron Goblin".
"I second that" :D

[A Fish Named Wallyum]

The Red Max with a "D" engine is usually painted Yellow-Orange and Black and is known as the "Astron Goblin".

Good point. :cool:

[Chas Russell]

The Red Max is a BT-60 while the Goblin is a BT-55, so no real corollation except for fin design and nose cone shape. But then, I digress...

I guess you could stretch the Goblin and get Der Big Orange Goblin. Bill answers."Hhhmmmmm...."

Chas

[ghrocketman]

OOPS...
My Bad...
I thought they were both BT-55.
Actually I've never built either one of them.

So then is the Big Red Max roughly the same size as the Citation Patriot ?

[Jeff Walther]

The Red Max with a "D" engine is usually painted Yellow-Orange and Black and is known as the "Astron Goblin".

<chuckle> Beat me to it by a few months. I was going to post that it sounded like he built a Goblin after I read the rest of the posts.

I still have my Goblin from the 70s. One of the few kits that seems to have survived decades of storage and neglect and moves intact. Dare'st I launch it?

[Rustee]

Hey Fish,what are those things that look like sailboard sails in the above pics,wind socks? Or something to hide behind to take a wizz? ha

[sandman]

Actually I've never built either one of them.

And why not??? :rolleyes:

[ghrocketman]

No real reason for the Red Max, just never built one.
As for the Goblin, this one is just a little small in my book for "D" power; yes I actually like getting my rockets back, and no it would not do to fly one without the "D" !
Although my "backyard" is a 500 acre farm field that I am allowed to recover into, I'm not sure I'd want to walk the distance to recover a Goblin on a D12-7 in anything but zero wind.

[Doug Sams]

No real reason for the Red Max, just never built one.
As for the Goblin, this one is just a little small in my book for "D" power; yes I actually like getting my rockets back, and no it would not do to fly one without the "D" !
Although my "backyard" is a 500 acre farm field that I am allowed to recover into, I'm not sure I'd want to walk the distance to recover a Goblin on a D12-7 in anything but zero wind.Wuss.

:D

Doug

.

[A Fish Named Wallyum]

Hey Fish,what are those things that look like sailboard sails in the above pics,wind socks? Or something to hide behind to take a wizz? ha

We share the park with a lot of other groups, and on this particular day they had a Kite Fest. Pretty impressive, really. The amount of time and money that people put into the things is incredible. I was talking to one lady during a recovery walk and it was pretty clear that she thought what I was doing was every bit as odd as what I thought about what she was doing.
And we call the things we pee behind "trees". :rolleyes: ;)

[D-12 Dave]

[QUOTE=A Fish Named Wallyum] The amount of time and money that people put into the things is incredible.

Sounds suspiciously familiar :D

[West Shore Rockets]

I put an old Aerotech 18mm D21-4 in a Der Red (actually blue) Max.

Mistake.

Yeah, never got that one back. Even at the club launch. Gave me a nice whiplash when it launched trying to follow it going up. yeah, that one hurt.

Don't do this.

[pantherjon]

LOL...I haven't done it, but have been tempted to do exactly the same thing in my DRM.Now, I know not to!..Saw a fellow club member put a D21 in his Solar Flare last weekend at our club night launch..Looked like the lights you see on a passenger jet at 30k feet when it reached apogee!:eek: I was more surprised that he actually got it back! ;)

[o1d_dude]

Hey, I'm cloning a Big Red Max which was a Red Max with an 18" body tube. I used a long engine hook for E-engines and a Semroc ejection baffle. If I can get a calm day the weekend, I'll let you know how it works .

I RocSim'd it and it was over-stable.
Sorry to resurrect a rather old thread but the topic is of interest to me as I have a Der Red Max kit sitting on my workbench as we speak.

The stock DRM body tube measures 1-5/8" OD and 8-1/2" long. In addition to the difference between the lengths of Der Red Max and Der Big Red Max body tubes, I'll also need a longer motor tube, right? The old DBRM plans show a BT-20B.

[gpoehlein]

Sorry to resurrect a rather old thread but the topic is of interest to me as I have a Der Red Max kit sitting on my workbench as we speak.

The stock DRM body tube measures 1-5/8" OD and 8-1/2" long. In addition to the difference between the lengths of Der Red Max and Der Big Red Max body tubes, I'll also need a longer motor tube, right? The old DBRM plans show a BT-20B.

The most flexible arrangement for a DBRM would be to put a 3.75" (or longer if you want to use it like a stuffer tube) BT-50 motor tube in there. You'll need new (or widened) centering rings. With the longer motor tube, you can fly it with E motors, use the 1" orange spacer to fly it with a C11 or D12 motor, or use the spacer and an adapter to fly it with an 18mm C or D. Adapters are really easy - you just need a 2.75" BT-20, three 2050 centering rings, a motor clip and a BT-20 motor block.

Greg

[West Shore Rockets]

Sorry to resurrect a rather old thread but the topic is of interest to me as I have a Der Red Max kit sitting on my workbench as we speak.

The stock DRM body tube measures 1-5/8" OD and 8-1/2" long. In addition to the difference between the lengths of Der Red Max and Der Big Red Max body tubes, I'll also need a longer motor tube, right? The old DBRM plans show a BT-20B.

I actually used an Aerotech 18mm D engine.

But you'd need a new engine tube (BT-50, about 3.75 inches long) and new centering rings (BT-60 to BT-50). Other than that, you should be good to go. Make sure you swing test it though. Not sure how much the heavier engine will throw it off, if at all.

[o1d_dude]

Thanks for the suggestions.

Much appreciated as I'm only just returning to the sport after an 18 year absence.

[BoosterDude]

My clone Big Red Max flies great on the Estes E9's. The standard Red Max is a great flyer on D12's, just finishing mine now. I'm making it a Blue Max with decals from Phred.