# Binder Design Raptor (with a camera)

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#### m85476585

##### Well-Known Member
I finally got around to building my Binder Design Raptor. It was originally intended to be my L2 rocket, but I didn't get a chance to built it last year, so I flew a smaller rocket instead (successfully). I'm planning on flying it this weekend at the Mudrock launch at Black Rock. It will probably fly on a J315, depending on what that sims out to.

The altimeter bay is mostly done, I'm just waiting on some parts from McMaster-carr that should be here tomorrow. I just started gluing the fins on. So far I have two done and 10 to go! I'm not worried about it taking too long, though, since once I get the first row of fins on, the second row will be easy to line and clamp up with a straight piece of material. And the little front fins are basically optional if I don't have time.

#### m85476585

##### Well-Known Member
I got some parts in the mail today. The right standoffs from Perfectflight (I couldn't find any at McMaster-carr), and a bunch of stuff from McMaster. I got closed eye bolts, several sizes of lock washers, t-nuts, some flat washers, and some plastic rivets. The only thing I really needed was the plastic rivets!

I got the 4 lower fins and one upper fin on, and 3 of the lower ones filleted to the motor mount with a mix of thick Aeropoxy, chopped glass, and Kevlar pulp. The outer fillets will get a less stringy mix so they look nice.

#### m85476585

##### Well-Known Member
All the fins are filleted to the motor mount, except for one side of one where I ran out of mixed epoxy. I still need to slot the tube, then I'll fillet all the fins to it at once. Also left to do is finishing the e-bay, digging up the recovery harness from another rocket, putting it all together, ground testing, and packing the car. I might add a quick coat of paint on the upper parts (I want to fiberglass the fins tip-to-tip, so I'll leave them unpainted) to make it more visible on the dry lakebed.

#### m85476585

##### Well-Known Member
I'm going to work on some of it inside for tonight since the garage is suddenly infested with really aggressive mosquitos. There was only one an hour ago, and I caught it with the vacuum.

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#### m85476585

##### Well-Known Member
Slots are done, I'll test fit them tomorrow.

update: It looks like it will go 3000-4000 feet on a J315 depending on the final weight.

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#### m85476585

##### Well-Known Member
I got it done (I think), and I got the car packed for tomorrow. Even with the rocket box (ski box) on top, it was tight to fit everything in. A trailer would be really nice.

I forgot to get a final weight, and there's probably a lot of other stuff I forgot. The camera is staying at home because it just adds too much complexity, and I didn't have time to make a good mounting setup for it. The fin slots between the upper and lower fins are just covered with tape since I didn't have time to think of a good way to fill them. I can probably cut up the pieces of tubing I sliced out. The altimeter bay was really easy to set up now that I have some plastic rivets. My last one used #4 T-nuts in the e-bay with screws screwed in from the outside. I don't have a switch, so I will just use the twist and tuck method. For recovery, I will use the included chute and recycle the shock cords and stuff from another rocket. Motor retention is t-nuts in the centering ring as pictured above with bent strips of metal to hold onto the motor. I also used T-nuts for the rail buttons. I like to do that since it provides a somewhat secure attachment point and separates the rail from the body tube a bit more so it is less likely to get scratched.

#### m85476585

##### Well-Known Member
The flight was successful, and it reached 2830 feet on a J315R. The final weight was 6.7lbs. Recovery was drogueless and the included main, and it went perfectly. I used 1 gram of BP for the drogue and 3.5 grams for the main (the main compartment is 30" long). This rocket really needs a K motor!

I'll see if we got any good pictures and post them later.

#### Pantherjon

##### Well-Known Member
Congrats on a successful flight!

But, 3.5 grams? Part of the 'blow it up or blow it out' club? I have a couple DD rockets(3" and 4" in diameter) with 30"+ long main compartments and I get good deployment using only 2 grams..If it works, so what..I just think 3.5grams is a bit much..

Looking forward to seeing the flight pics.

#### m85476585

##### Well-Known Member
I kind of didn't have time to ground test.

#### m85476585

##### Well-Known Member
I flew it again today on a K550 (my first time flying a K). The altitude was 5460 feet. The only problem was that the main deployed at apogee. I think I used too much BP in the drogue section since I couldn't remember what I used last time. I did have two .063" shear pins, but I guess they still failed. This time I used 1.6g for the drogue and 3g for the main.

I really wanted to fly it on a CTI J or K skidmark, but one of the dealers didn't show up and the other two dealers had very little CTI stuff (I was planning on buying/borrowing a case at the launch). Instead, I had to buy an AT 1706 case at the launch.

#### Chrisn

##### Well-Known Member
I did have two .063" shear pins, but I guess they still failed.
What material do you use for shear pins?

#### m85476585

##### Well-Known Member
Styrene rod with one end mushroomed by a hot soldering iron so they don't fall in.

#### C.O.B.H.C.

##### Well-Known Member
I flew it again today on a K550 (my first time flying a K). The altitude was 5460 feet. The only problem was that the main deployed at apogee. I think I used too much BP in the drogue section since I couldn't remember what I used last time. I did have two .063" shear pins, but I guess they still failed. This time I used 1.6g for the drogue and 3g for the main.

I really wanted to fly it on a CTI J or K skidmark, but one of the dealers didn't show up and the other two dealers had very little CTI stuff (I was planning on buying/borrowing a case at the launch). Instead, I had to buy an AT 1706 case at the launch.
I just want to say nice flight.

But question why do you sound all bummed about buying a 54/1706?

#### m85476585

##### Well-Known Member
I just want to say nice flight.

But question why do you sound all bummed about buying a 54/1706?
I'm not really bummed about it, I just wanted to get a CTI case instead. My next chance to fly this rocket won't be until next summer, so I won't be able to fly a skidmark until then. I already have way too much money invested in motor cases (I have most of the AT 29mm and 38mm ones, all the hobbyline cases, and now I have two 54mm cases. I'm getting close to having spent \$1000 on cases.), so I am trying not to buy more new ones than I need to. I guess I could get the next size up CTI case (5-grain?) next year since skidmarks are lower ISP, then fly one of the other loads for it if I want to go higher.

#### Diosces

##### Well-Known Member
Can you post a picture or two of the finished rocket?