Build Thread -- Estes Greyhawk

[COSTransplant]

So, I was encouraged to post some pictures of this first build of a Greyhawk. I know it is not going to be perfect -- and I am doing some of this on the fly -- but I like the progress so far. I have pulled as many pictures / details as I could from this forum and elsewhere. I am working from the old Estes instructions since this kit is OOP. So it won't be perfect, but it will be fun!

 

[JRL303]

Following with interest!

 

[COSTransplant]

I just put the engine nacelle on there to see how they look, but I'm still undecided.

 

[hobie1dog]

what color will it be?

 

[COSTransplant]

I've really not thought about that too much yet. I am going to have to do a bit of looking around, but of course I want to buy an air brush! What I have figured out so far, is that I need to do A LOT more prep work -- sanding and filling, etc. -- before attaching fins and I need titebond molding and trim glue for fillets, and I should have considered strengthening the fins ahead of time.

 

[COSTransplant]

Not sure which I like -- the nosecone or the nacelle.

 

[neil_w]

The lipstick all the way.

 

[OldGuy1967]

Is this a clone build, as it looks like it? Looks good so far and would go with nacelle for sure. I know one of these kits is on ebay right now for $75, so out of my range, but have wanted to build one, so following.

 

[Back_at_it]

Nice work on the clone. I too would go with the nacelle over the nose cone. Did you intentionally changes the direction of the upper fins?

I did a restoration of my original a while back and the hardest part of the entire project was figuring out what to do with the paint.

Estes Gray Hawk #2068 Restoration

I wish. I had a warm day that popped up and I could heat the garage. Unfortunately all of the cars are put away for the winter hibernation so no more painting in the garage. If I get the making down this week, I'd like to get it painted this weekend and off the bench as I'm wanting to start...

www.rocketryforum.com

 

[COSTransplant]

Is this a clone build, as it looks like it? Looks good so far and would go with nacelle for sure. I know one of these kits is on ebay right now for $75, so out of my range, but have wanted to build one, so following.

Kit sold in like 5 minutes. I was sleeping!

 

[COSTransplant]

Nice work on the clone. I too would go with the nacelle over the nose cone. Did you intentionally changes the direction of the upper fins?

I did a restoration of my original a while back and the hardest part of the entire project was figuring out what to do with the paint.

Estes Gray Hawk #2068 Restoration

I wish. I had a warm day that popped up and I could heat the garage. Unfortunately all of the cars are put away for the winter hibernation so no more painting in the garage. If I get the making down this week, I'd like to get it painted this weekend and off the bench as I'm wanting to start...

www.rocketryforum.com

Doh! So how is at all possible that I looked at this rocket hundreds of times and I never realized that I put the upper fins on incorrectly? That just seems impossible. So I spent some time last night removing those two upper fins to create new fins and put them on correctly. Today's little project.

 

[neil_w]

Doh! So how is at all possible that I looked this rocket hundreds of times and I never realized that I put the upper fins on incorrectly?

Given the number of Cherokee-Ds and others we've seen around here with fins on backwards, I'd say it's very possible indeed. No biggie!

 

[COSTransplant]

So, it's kind of like a great car that looks fantastic from 20 feet. I've primered the Greyhawk -- in grey of course. Now, I will sand everything and work on a good paint scheme. Probably some red and I am not sure what else. Unfortunately, the primer paint REALLY brings out all the imperfections / inadequacies in my craftsmanship. I need to tighten up my game! And yes, I did take the two fins off and put them back on correctly! Whew.

 

[COSTransplant]

For my fisrt build, I'd say this didn't turn out terrible -- and I learned alot! Still need to finish painting -- it is just the base grey now -- but I will work on color for the stabilizers and nacelle. More "stuff" to add to this build when I start reworking it -- after the first flight of course -- but I'm happy with my first attempt. And of course, thank you Apogee for your patience with my many visits!

 

[COSTransplant]

With the fins painted.

 

[PayLoad]

 

[COSTransplant]

Complete for now.

 

[BABAR]

That’s a great rocket, looks good by any standard, let alone a first build. Mine was pretty juvenile, even if I wasn’t at the time.


I think yours will be stable with one single central motor, not sure how well it will do with three.

May want to swing test it before a cluster launch, or you may find it a cluster of a different kind.

 

[COSTransplant]

That’s a great rocket, looks good by any standard, let alone a first build. Mine was pretty juvenile, even if I wasn’t at the time.
View attachment 546395

I think yours will be stable with one single central motor, not sure how well it will do with three.

May want to swing test it before a cluster launch, or you may find it a cluster of a different kind.

That is pretty funny -- I like it! But now I have to go look up what it means to do a swing test. I suspect it has something to do with trying to figure out where the CG is and if I need weight in the nose cone and / or a longer main BT.

 

[COSTransplant]

So I did get my Greyhawk in the air this weekend down in Pueblo. Just one launch with one main engine and it was a perfectly straight flight. Unfortunately, I broke a fin on landing and that was the end of my day with that rocket. So, the three engine flight will have to wait for another clear day. But all in all, a great first flight.

 

[grapetang]

Congrats! If it was one of the wings that broke, you may want to check the balsa grain. The grain is supposed to run parallel to the (main) leading fin/wing edge, not parallel to the body tube. If the latter, reinforce the leading edge with a dowel or cut off and completely replace with correct ones. Congrats again & good luck!

 

[neil_w]

Congrats! If it was one of the wings that broke, you may want to check the balsa grain. The grain is supposed to run parallel to the (main) leading fin/wing edge, not parallel to the body tube. If the latter, reinforce the leading edge with a dowel or cut off and completely replace with correct ones. Congrats again & good luck!

I didn't notice this in the earlier pictures until I just zoomed in, but you are absolutely right:

Fins built in this way will be *very* weak and prone to breakage. Grain should be in the direction of the black line.

Of course, such fins can still break... but you will have maximized their chances of survival.

 

[COSTransplant]

This is one of those "you don't know what you don't know" things! I appreciate all the guidance, and I certainly will not make the same mistake again!