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Old Mar 22, 2006, 01:26 AM
Registered User
Gold Coast Australia.
Joined Jan 2005
2,537 Posts
Roy S. has not really changed much at all in all those years---think he may even have the same shorts for flying. LOL.

He is a top modeler and person, and when we did Yugo. in '85 together with the women there was never a drama. 3 weeks of "grey hound" and pivo. He will know.

Better tell him to get on here McGiver.
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Old Mar 31, 2006, 06:40 AM
Grumpy old git.. Who me?
JetPlaneFlyer's Avatar
Aberdeen
Joined Mar 2006
12,161 Posts
Here are a few of my free flight Rapier rocket power models (my own designs unless noted otherwise).....

Yak 25M 'Flashlight' twin


Mig 21


Hawker P1121


F105 thunderchief (AKA 'Thud')


DH108 Swallow


Blohm & Voss BV P.215


Bachem Natter (133% scale from a Richard Crossley plan)


Yokusuka MXY7 'Ohka' (AKA Baka)


The Ohka is shortly due to appear as a free plan in RC Model Flyer Magazine in the UK so I went to town on the detailing:


I hope you like them

Most of my plans can be downloaded free from Mike Stuarts web site
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Last edited by JetPlaneFlyer; Mar 31, 2006 at 02:04 PM.
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Old Mar 31, 2006, 09:42 AM
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Ajax, Ontario, Canada
Joined Oct 2004
2,615 Posts
VERY impressive craftsmanship!
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Old Mar 31, 2006, 11:21 AM
Intermediate Multi
Trisquire's Avatar
Columbus, OH
Joined Mar 2005
3,337 Posts
Does someone still make fuel pellets for "Jetex" type rocket motors?

Tom
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Old Mar 31, 2006, 11:39 AM
Grumpy old git.. Who me?
JetPlaneFlyer's Avatar
Aberdeen
Joined Mar 2006
12,161 Posts
Quote:
Originally Posted by Trisquire
Does someone still make fuel pellets for "Jetex" type rocket motors?

Tom
Unfortunately no
A Jetex copy was made in the early 1990's called 'Jet-X'. These too are no longer manufactured but you still sometimes see these motors and fuel being sold as 'new' old stock. However the Jet-X fuel is not backward compatible with the original aluminium bodied Jetex motors (possibly may be ok with the later steel bodied Jetex)... In any case the Jet-X pellets are generally regarded as poor, being both hard to ignite and low in thrust.
Original Jetex fuel and motors have become quite collectable, they come up on ebay regularly but the price is prohibitive for anyone actually wanting to use the motors as opposed to 'collecting' them.

Best bet by far is the single use cardboard body Rapier motors. They are much more user friendly than even the best Jetex motor ever was and are also much lighter... The biggest problem with Rapiers is that they are the product of a one man cottage industry in the Czech Republic and therefore supply tends to be sporadic. Right now there is a serious Rapier drought I used my last motor several weeks ago and I've not been able to get any since, hence my current interest in EDF

Check out http://www.jetex.org for all you need to know about this stuff
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Old Mar 31, 2006, 01:03 PM
Zach
Illinois
Joined Feb 2004
806 Posts
Two words: Holy Cow!

Iíve never seen a model Ohka before, just hope you didnít go too scale on it.

Zach
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Old Mar 31, 2006, 02:07 PM
Grumpy old git.. Who me?
JetPlaneFlyer's Avatar
Aberdeen
Joined Mar 2006
12,161 Posts
Quote:
Originally Posted by Tail Spin1
Two words: Holy Cow!

Iíve never seen a model Ohka before, just hope you didnít go too scale on it.

Zach
I stopped just short of cramming the nose full of TNT ... Though with the amount of lead shot i had to put in the nose to get it to ballance a working warhead is a real possibility
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Old Mar 31, 2006, 02:22 PM
Intermediate Multi
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Columbus, OH
Joined Mar 2005
3,337 Posts
I wonder if low thrust Estes rocket motors would work. They're also single use cardboard body.

Tom
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Old Mar 31, 2006, 03:19 PM
Grumpy old git.. Who me?
JetPlaneFlyer's Avatar
Aberdeen
Joined Mar 2006
12,161 Posts
Quote:
Originally Posted by Trisquire
I wonder if low thrust Estes rocket motors would work. They're also single use cardboard body.

Tom
No, they are too short duration for conventional aircraft use. Typically a Estes rockets have a duration of less than 1 second. They may be ok to fire a 'boost glider' skyward in a ballistic fashion (like the Baka mentioned a few posts earlier) but they cant be used in models designed to fly under sustained power. Rapier motors by comparison have much lower thrust than even the smallest estes Rocket but have a duration between 15 and 30 seconds.
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Old Mar 31, 2006, 06:29 PM
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Gold Coast Australia.
Joined Jan 2005
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Very, very, very good. Wonderfull building. Are they all trimmed, and fly?

You are right about the Jet-X fuel, it does not have the 'grunt' of the original.
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Old Apr 01, 2006, 02:24 AM
Grumpy old git.. Who me?
JetPlaneFlyer's Avatar
Aberdeen
Joined Mar 2006
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Quote:
Originally Posted by gossie
Very, very, very good. Wonderfull building. Are they all trimmed, and fly?

You are right about the Jet-X fuel, it does not have the 'grunt' of the original.
Thanks for the kind words

Yes thay are all trimmed and fly. As you would expect some fly better than others but they are all capable of putting in a decent performance. The two tailless models are perhaps the ones capable of the longest flights in terms of endurance, I almost lost the BV P.215 on it's 3rd trimming flight! The F105 needs plenty of power because although it's light (26g) it needs quite a high flying speed. The Ohka was a tricky little beast too mainly bacause i had to add enormous amounts of nose weight making it a bit on the heavy side, but it does fly. The little (8" span) Natter is a spectacular performer, especially on an 'HP' motor, but glides like a brick.

here are a few videos (sorry but the quality of some is poor)

P1121
F105
DH108 with 200mN L2-HP
P1121 with L2-HP power
BV P215
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Last edited by JetPlaneFlyer; Apr 01, 2006 at 02:41 AM.
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Old Apr 01, 2006, 02:41 AM
sensitive artsy type
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Tucker, Georgia, United States
Joined Feb 2004
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Enjoyed the pics and vids, very nice work!
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Old Apr 01, 2006, 04:31 PM
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Columbus, OH
Joined Mar 2005
3,337 Posts
That is a much longer burn time than an Estes rocket. The Swallow has a nice glide once the power stops.

Tom
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Old Apr 25, 2006, 07:19 AM
Registered User
Ajax, Ontario, Canada
Joined Oct 2004
2,615 Posts
Finally building a replacement 'Applehoney 610' fuselage for the one that got destroyed in a workshop accident to many years ago; at least the wing and stab (only flown a couple of times) have had time to 'age' !
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Old Apr 25, 2006, 07:56 AM
flight999
England
Joined Dec 2002
2,344 Posts
Is that a Tatone or KSB snuggling down
behind a unrecognised diesel? Perhaps
I am not quite so out of date as I thought.

Burn some holes up there, thermals,
Flight
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