Feb 1971 Model Airplane News

[mike londke]

I recently purchased 2 vintage DynaJet kits manufactured by Mike Hoyt. Along with the assembly instructions was a sheet on modifications for the DynaJet. It references the Feb 1971 issue of M.A.N. for rework of the flowjector. I’d be appreciative if someone could scan it for me. My jets generally start easily and run well. I say mine but they actually were dad’s first. I’m curious if my father made the modifications recommended by Mr. Hoyt. I’d like to read the article and inspect/measure the flowjectors to see if dad did the mods. Thanks!

[James Lee]

Mike
PM your snail mail address and I will mail the article to you.
Thanks
Jim

[mike londke]

Mike
PM your snail mail address and I will mail the article to you.
Thanks
Jim

Will do and Thank-you sir!

[Carl Cisneros]

Mike

I hope you have some spare metering-jets as well.
they are the jets that screw in to the front of the flojector for regulating the fuel in to the engine.

Carl

If you do have them, get a good numbered twist bit set for making your own set of numbered jets.

If you need some help with the engine please feel free to get hold of me during the work week before 11AM eastern or weekends between 6 and 8 PM eastern time.

you have a PM

Carl

p.s.  almost forgot, what KITS did you get?
        let me know and I can help you all sorts of info on his kits.
        I used to fly jet speed in the 70's with Mike and a bunch of other guys from around the country when I was in the Air Force.

[mike londke]

Carl I purchased the Tamigo and Catjet kits from Mike Hazel. The Catjet is a replacement for one my dad built in the 60’s. It has tons of flights and is now retired. I’m familiar with metering jets and how they work. I just wanted to read the article for myself, I already modify my flowjectors and was curious. Regards, Mike

[paw080]

I recently purchased 2 vintage DynaJet kits manufactured by Mike Hoyt. Along with the assembly instructions was a sheet on modifications for the DynaJet. It references the Feb 1971 issue of M.A.N. for rework of the flowjector. I’d be appreciative if someone could scan it for me. My jets generally start easily and run well. I say mine but they actually were dad’s first. I’m curious if my father made the modifications recommended by Mr. Hoyt. I’d like to read the article and inspect/measure the flowjectors to see if dad did the mods. Thanks!

Hi Mike, doing the Mike Hoyt Flowjector modification means grinding the air intake tube that

directs the air over the fuel outlet holes at a precise angle. This means that you will either

have to hold your air nozzle at the exact angle to cause the fuel to atomize before passing

by the valve petals; or you will have to make a fixture that holds your air pressure gun at

the correct angle.  Mike Hoyt preformed the modifications to my jet engine.  My Cat-Jet

clocked 158 mph on 70' lines running on Coleman fuel.  The model would go a bit faster

if I would keep the model at a steadier altitude.  This is hard to do because of the older period

design with the initial nose heavy takeoff fuel configuration, then burning enough fuel to render

the model to a proper CG allowing it to stay in a groove.  This model is not designed to

to use the modern jet fuel formula required by AMA current rules. It has a fuel tank that is far too small

for the AMA fuel formula.

I got tired of trying to start the engine while holding the air gun at the correct angle, wasting

air from my air cylinder before the motor started.    So I bought a stock flowjector, it came with

the appropriate metering jet(old school for white gas!).  I soldered a brass tube onto the stock

FlowJector threaded air intake nipple; this made starting the motor much easier, wasting  less air,

and the model still logged 155 mph on the Colman fuel.

My Cat-Jet is simply flown every now and then(three years ago) simply for nostalgia sake. 

I hope my posting reply helps make some kind of sense,  I do wish you the best good fortune

with your Jet projects.   Tony G.   

[mike londke]

Thanks for the reply. I'll be running the "new" Catjet on gasoline just like the old was run. One of my engines is set up just for gas. Others are set up for the 80/20 mix which I use on models with much bigger tanks. The Catjet on gasoline has plenty of fuel to make 20 laps or so. I'm not trying to break records, just having fun.

[Carl Cisneros]

yes, the Tamigo was a great trainer for me the first year, then I went on to the Cat Jet and Sidewinder models.
The fasted one of the bunch was my Cat Jet using (back in the 70's, the 4 1 1 1 mix) (Alcy, benzine, nitro, prope)

I set all my planes up using the (new again back in the 70's) the EVS cameras on the B-52's where I was stationed in CA.
All my models I could fly after take off with out using the button on the mono line handle. They were that straight flying.

Fastest one was actually the Cat Jet that Frank Hunt and I modded. Metal wings, opened up head and .080" over back plate and opened up
reed intakes and 2 wire control instead of mono line. Looked up my old info out in the garage. Speed with 2 wires (TIED) was 187mph consistent.

Carl