Flying Styro A7 Corsair

[Figure9]

I just aquired a complete package including the kit, Hitec radio, Jeti esc, nimh battery, brushed motor, Vesa55 fan and nimh charger. I typically don't follow the jet forums, so I'm wondering if this kit is OK in its stock form. Do I need any mods? It looks like its the package Hobby Lobby sells for $350.00, but I don't see the A7 anymore. Was this discontinued? Any info would be appreciated. Thanks

[dave morris]

Most reports have been that with a stock brushed motor and Nimh cells will result in a very sedate flying jet. If you want it to fly well as with most jets you will need to use a BL motor and lipo to get good peformance. A light BL motor with a KV of around 4000 will work well with a 3s Lipo that can handle up to 15 amps. Should get you around 150 watts. Keeping it light is key to survival of those kind of foamie jets. Also IIRC there needs to be a cheater inlet put it. I am sure you will find all kinds of data if you use the search. It is a older topic so the battery and motor data may be a little out of date.

[Dukester]

I picked up one of these from a guy on here recently. Not a bad looking plane, but he's right about the cheater inlet, there's no where near enough area on the intake as molded.

One thing my plane was missing was elevators. I'd really apreciate it if you could post a few pics of your elevators and maybe dimensions as I need to cut some new ones and would like them to be close to right.

Thanks,
Duke

[Figure9]

Thank for all the input so far. I'll take a look at the elevators tonight and post a picture and the dimensions.

[bruff]

The inlet is fine. No cheater hole is required. I use to fly this with a red flame blaster EDF unit. Flew very well. Contact EJF.com Robert may still have the conversion instructions he put out.
Bob
PS See http://www.rcgroups.com/forums/showthread.php?t=5098&highlight=flying+Styro+a+7 This may help.

[Dukester]

Bob,

I'll have to measure again more carefully, but on mine, the inlet area is well under 75% of the fan FSA. I'm pretty new to edf, but my homework says optimally inlet > FSA > exhaust.

Which brings up another general question, some guys talk about swept area and some talk about frontal area. How does swept area figure into proper ducting?

Duke

[Figure9]

Here are some pictures of the elevator.

[Dukester]

Thanks for the pics. I can just trace over the pics to scale and print a template. Very helpful.

Duke

[bruff]

You are correct it is 75% FSA but it did not affect how this plane flew. I think because the way it was set up it had an inlet duct not an opened area. The build instructions from EJF will help explain this.
Bob

[AirX]

Bob,

I'll have to measure again more carefully, but on mine, the inlet area is well under 75% of the fan FSA. I'm pretty new to edf, but my homework says optimally inlet > FSA > exhaust.

Which brings up another general question, some guys talk about swept area and some talk about frontal area. How does swept area figure into proper ducting?

Duke
Frontal area is used in drag calculations, frontal area of the duct that is exposed to the airflow will generate drag at speeds that produce airflow faster than the fan can process.

Fan Swept Area, think of the it this way. Air cannot flow thru the motor so physics says that for every rpm of the rotor the area the air flows thru minus the motor/motor holder/spinner will produce a defined volume of air thru it, as it leaves that FSA it enters an outlet duct that has more area available to move the air into so the airflow slows down as it fills the extra volume, if you have a reduced outlet of at least maximum area the same as FSA the flow will regenerate its velocity, if the outlet is constant tubular in section to the outlet it will lose that energy and velocity and it will be somewhat slower than the energy and velocity originally put into it. The physical law that governs this phenomenon is called "Conservation of Mass", if the there is nothing added or taken away then mass will be constant.
Hope this helps.

Eric B.

[dave morris]

You are correct it is 75% FSA but it did not affect how this plane flew. I think because the way it was set up it had an inlet duct not an opened area. The build instructions from EJF will help explain this.
Bob


Oh I did not think it had an inlet duct, in that case a cheater would just mess things up.

BTW my comments are just from what I recall reading about this little jet, don't want to mislead anyone.

[Ed Waldrep]

I don't think the kit comes with an inlet duct but I could be wrong. Maybe Bob added one?

[bruff]

I found the build pictures. I stand corrected. I did use a cheater hole. See the enclosed pictures.
Bob

[bruff]

One more set of pictures.
Bob

[Dukester]

Thanks for the pics. How did you actually drive the elevator? I couldn't tell exactly from the pics.

Duke

[bruff]

Hope these pictures help.
Bob

[Dukester]

Bob,

Thanks, I see what you did.

I just realized I've totally hijacked figure9's thread. :rolleyes: Hopefully he'll forgive me.

Duke

[Figure9]

I don't mind at all! I have been learning alot. The amount of information you guys have is amazing.

[bruff]

Makes me what to build another with the new power systems.
bob

[Figure9]

Well, I think I'm going to sell this package. Check out the classifieds:
Here (http://www.rcgroups.com/forums/showthread.php?t=540102)

[KOOLSTRADER]

We have a few of these flying styro corsairs in stock, and the f-16 by flying styro, nice jets, really nice scale looks. requires a good builder who can install everything, and use some engineering skills to make certain things work. In the air, very fast , or seems very fast because of its small size. You want to turn, good luck. the only way is to Bank it and Crank it

skill level for these 8-10
flew jets already, at least 2-3 different types


both flying styro jets in stock at

RC WORLD INTERNATIONAL inc
RADIO CONTROL HOBBY
WWW.RCWORLD.US

[tail-heavy]

We have a few of these flying styro corsairs in stock, and the f-16 by flying styro, nice jets, really nice scale looks. requires a good builder who can install everything, and use some engineering skills to make certain things work. In the air, very fast , or seems very fast because of its small size. You want to turn, good luck. the only way is to Bank it and Crank it

skill level for these 8-10
flew jets already, at least 2-3 different types


both flying styro jets in stock at

RC WORLD INTERNATIONAL inc
RADIO CONTROL HOBBY
WWW.RCWORLD.US


Thanks.

[kevin]

here is a review i did of this plane 5 years ago. obviously there are way more and better power choices these days but it should give you a good idea about the plane as a whole.

http://www.rcgroups.com/forums/showthread.php?t=197402