Extreme Speed Prop Planes Discuss the need for speed with fast prop planes (Screamin Demon, Diamond Dust, Shrikes or any REAL sound breakin'''' plane)

The Rocket

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Old 03-11-2008, 06:30 PM
  #1  
Flyboy Dave
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Default The Rocket

I decided to bring out something new this Spring....something quick, something with a
lot of power. I had this Harmon Rocket in the pile, nice plane....it calls for a .46 ....

....yeah, right. ....I'm stuffin' this tuned pipe OS Max 90 FSR in it. That should work.

FBD.
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Old 03-11-2008, 07:16 PM
  #2  
HaveBlue
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Default RE: The Rocket

ORIGINAL: Flyboy Dave
...it calls for a .46 ....

....yeah, right. ....I'm stuffin' this tuned pipe OS Max 90 FSR in it. That should work.

FBD.
Dave I like the way you think...I did the same thing everytime I bought a car and it only had a small block in it..(not that theres anything wrong with a small block)..the only adjustment I have made to this philosphy with planes is base my decision more around R.P.M and then displacement..but none the less..I love it[sm=thumbup.gif]
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Old 03-11-2008, 09:03 PM
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Default RE: The Rocket

FBD
Where is the Nitrous Oxide tank going to go.
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Old 03-11-2008, 09:50 PM
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SPEED JUNKIE
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Default RE: The Rocket

Flyboy Dave, you have "ENLARGED C.I. SYNDROME"
Was this you back in the day before you went in for treatment?
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Old 03-11-2008, 09:51 PM
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Flyboy Dave
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.....I don't think this puppy will need nitrous.....

I ordered a few props and a True Turn spinner. I binned the plastic spinner....
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Old 03-11-2008, 09:57 PM
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Flyboy Dave
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Default RE: The Rocket


ORIGINAL: SPEED JUNKIE

Flyboy Dave, you have "ENLARGED C.I. SYNDROME"
Was this you back in the day before you went in for treatment?
....the treatments didn't work.....bigger is still better.
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Old 03-11-2008, 09:58 PM
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Default RE: The Rocket

SJ: where do you find all these 'groovy' photos?

Man, I hope I can see this fly Dave, before you rip the wings off.
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Old 03-11-2008, 11:54 PM
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Flyboy Dave
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ORIGINAL: HaveBlue

Dave, I have made to this philosphy with planes is base my decision more around R.P.M
and then displacement..but none the less..I love it [sm=thumbup.gif]
I'm of the same inclination (most of the time) HaveBlue....
I tried a YS .91FZ....the engine as too long. I tried a Rossi full tuned pipe .61, and a full tuned
pipe OS Max .61FSR....neither would fit because the bend in the header was too tight, and the
pipe wouldn't clear the fuse and wing. [:@]

So, a quick trip to the LHS for a big mount for the big block FSR, and I'm in business.

Hey...they called it the Harmon Rocket.....

...."Rocket" it is.
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Old 03-12-2008, 12:05 AM
  #9  
Razor-RCU
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Default RE: The Rocket

Now I want to see that bay go!

NICE
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Old 03-16-2008, 11:41 PM
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Flyboy Dave
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Default RE: The Rocket

....I got some work done on the Rocket.

Engine mount finished.
Pressure fitting installed on the head-pipe.
New Tru-Turn spinner installed.
Cowling fitted and cut for intake, head, and pipe.
Prop installed.

FBD.
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Old 03-17-2008, 12:37 AM
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Old 03-17-2008, 03:45 AM
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Default RE: The Rocket

nice fit[sm=thumbs_up.gif]
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Old 03-17-2008, 06:49 AM
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Flyboy Dave
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Default RE: The Rocket

I did a search here on RCU on the Harmon Rocket in the ARF Forum and found several
threads. It looks like the Rocket has a few problems. []

If you put all three servos in the tail (one for the ruder, 2 for the elevator) it comes out
way too tail heavy with a regular engine. One guy had to put a pound of weight in the nose.
By the time you fill the tank, the weight of the plane makes it fly like a brick. There are
flutter issues with the horz. stab, and a couple failures and crashes. I saw that the tail
feathers didn't look good, that's why I did the search. The design of the stabs isn't too hot
either. The tail feathers look like a J-3 Cub.

The stock landing gear is too soft and bends on every landing. Some of the guys have
replaced the landing gear. I have a tough plastic gear I might try to fit.

My insane choice of a powerplant might not work out....oh well, it's not the first mistake
I ever made. I wouldn't be too happy if I stuffed that engine, it's one of my prized motors.
I don't really care about the plane....it's just another $150 dollar ARF to me.

http://www.rcuniverse.com/forum/sear...mitbutton=+OK+

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Old 03-17-2008, 08:09 AM
  #14  
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Default RE: The Rocket

Nice combo Dave!

I would seriously reccomend the horiz stab beef and to move the servos aft of the wing one bay - you certainly don't want them out in the slipstream - do you?

I added wood to the horiz stab and laminated top and bottom w/carbon roving.

Also beef up the wing mount.

I used carbon gear to .60 size funtana $23 from Horizon

I went Saito 82A and am very happy with it.

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Old 03-17-2008, 11:51 AM
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Default RE: The Rocket

I have seen one that had issues with the tail, as well as the fuselage just aft of the wing, not sure what went first.
It was rebuilt but I was not impressed with the original design at all!
For what its worth I think the Cub is built better given its flight envelope....
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Old 03-17-2008, 12:01 PM
  #16  
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Default RE: The Rocket

Designed for a .46 and has a .90 stuffed in it. Who needs tail surfaces?
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Old 03-17-2008, 12:12 PM
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Default RE: The Rocket

Lookin' good Dave!
Don't worry about flutter, weak joint's and bad habbit's on that baby.
That is what lot's of epoxy and scrap spruce is for!
I know your a mechanic and could probably repair the Space Shuttle with some zip tie's and bailing wire![X(]
GET-R-DONE and bring her.[>:]
If you are timid about the maiden, I'm sure Razor will be standing right behind you ready to do the honor's!
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Old 03-19-2008, 11:04 PM
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Default RE: The Rocket

I got sidetracked slightly by the passing of my pet Kitty on Monday. []

I am re-doing the tail feathers in solid 1/4" balsa. I can lighten the surfaces if necessary. I am
also going to use a different design for both the vert. and the horiz. stabs....something without
a built in flutter.

The design of these tail feathers sux.

FBD.
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Old 03-20-2008, 01:19 AM
  #19  
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Bummer about your little buddy Dave. Sorry to hear it. []
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Old 03-20-2008, 09:43 PM
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Default RE: The Rocket

....thank you, Tom....she liked airplanes too.
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Old 03-20-2008, 09:57 PM
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Default RE: The Rocket


ORIGINAL: Flyboy Dave

....I got some work done on the Rocket.

Engine mount finished.
Pressure fitting installed on the head-pipe.
New Tru-Turn spinner installed.
Cowling fitted and cut for intake, head, and pipe.
Prop installed.

FBD.

the 1st picture in post #10.... the engine box behind the Rocket.......... FP 20

whats up with dat ??? the FSR too heavy????
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Old 03-20-2008, 10:16 PM
  #22  
Flyboy Dave
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....I think I got that box in with a buy-out of a local modeler. I have never owned an FP 20.

I do own a bushing OS 15, and I did have a bushing OS 25.

FBD.
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Old 03-21-2008, 07:01 AM
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Default RE: The Rocket

Hey Dave,
Sorry to hear about your loss. I know how painful a loss of a good animal friend can be - tougher than many humans.
I've got a little buddie who is getting up in years and slowing down a bit - and he probally thinks the same about me.

What do you have planned for the tail feathers?
Extending a small area forward the hinge line?

Your cowl cut outs look great.
Can't wait to hear your comments on this powerplant installation[8D]


Oh yeah, did I mention the nasty violent snaprolls this plane performs after proper strengthening?
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Old 03-27-2008, 10:32 PM
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Default RE: The Rocket

....well, I bought 3 pieces of 1/4"x 3"x 48" light balsa to remake the tail feathers. The plan
is to shape them the same as the tail on a Patriot, of which I have a kit in the box around
here somewhere. The tail feathers are of poor design on this plane IMO. I might brace the
stabs as well, just for over-kill.

I don't think this plane will be real fast....but it will be a terror on the vertical up lines.

FBD.
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