I used a 2oz. header tank ontop of a custom fibeglass tank I made for right behind the rear cockpit former. I shaped a block of foam into the triangular shape and then glassed it. Worked well and could hold tons of fuel for the .91, something around 20-25 ounces, which is a lot. I ended up using the Robart air up,spring down 510 units for retracts. They fit pretty well, but there is nothing "ARF" about this model.

Hi Ian,

Thanks for the info.

Did you balance th plane with fuel in the tank and add an additional 22 oz of weight to the nose section?

I have read your thread, the tank looked pretty cool. I konw you lost the plane, sorry [sm=sad_smile.gif] , do you still have the tank?

Thanks,

hello im almost finished with mine gonna do an engine test tomorrow and im not sure about the CG it calls for 5"(127mm) is this correct?
also what is the dry weight on yours mine came out to 11.5 lbs
thanks

is there any one building one?

Hello Edgar,

I was wondering if you could post a photo of your fuel tank setup. I haven't figured out a way to mount the tanks and yet have access to the front of the fan to start the engine. A photo of your setup would be appreciated.

Dave

I sold the plane. Don't have a photo of mine.
However I did the same as the attached photo. The starter wand angle was awkward, but it does work.

dw_crash,

I did something very similar to the attached photos. This is not mine but it should help.

Regards,
Mike

Mike,

Thanks for the pics. They are very helpful.

Dave

Edgar,

Thanks for the pic.

Dave

I saw this on ebay, Item number: 150231947484
I think this the one from Will Hobby. Is this the same one that you guys are building?

thanks,
Charles

cpierre82,

Yes, they have the same specs and probably same manufactuering facility. Mine is red white and blue. I have another one new in box that is all red.

Regards,
Mike

I just brought one on ebay for $290 shipped. I should have it by late next week. Where can I get the engine and fan unit?

Charles

cpierre82,


I am not sure what size engine you had in mind, but I recommend going with something larger than .65DF. Lot of guys have used a OS91 and Dynamax fan with great success. I have a OS 65 with Dynamax.

Regards,
Mike

Mike

where can I buy the Dynamax fan unit? I'll go with the OS91, (towerhobby). do I need to do any mods for the OS91?

Charles

Charles,

I believe JMP (jet model Product http://www.jetmodelproducts.com ) still sell the fan unit. You may even try RAMTEC fan (spelling??) which is suppose to be a better match for the OS 91. You can probably find a used combo on RCU, I have two or three fan units (my spares) if you are interested. They are used but in good shape.

Regards,
Mike

Mike,
send me your # to [email protected]

Gents,

On a previous thread, and in discussion with the vendor, I was warned not to use a Ramtec Fan. IT needs more air volume to operate than you can pass through the Hawk.

RCJI had a review of the Hawk, a couple years ago. The conclusion was that the best powerplant was the lightest. That being either a K&B 48 or OS 46 VR. The extra weight of the 90 size engine, and fuel, did not really pay-off against the lighter 40 size set-up. Weight is a killer in ducted fans......

Might want to look up the old review.

DW_Crash

Thanks DW_Crash I will look in to it.

Charles

Mine had a .46VX. Takeoff was marginal, but it flew nice afterward

jas anyone flown one of these on EDF ?

If you still have your building notes and pics for the Red Arrow would please email them to me at [email protected].
Thank you. I'm building one and the instructions stink. I'm going to use a 120mm EDF and electric servoless retracts.

Tom

Charles,

This is a tiny jet. All it needs is a DynaMax fan with a OS 46 VX motor and pipe. Anymore and the weight will climb from larger engine etc and the fuel load you will need. I flew Byron F-16 on OS 91 and fan. 24 oz of fuel was a 6 minute flight. Good luck stuffing 24 oz into this bird. I planned two saddle tanks parallel to the fan with the Dynamax/ OS 46VX combo. That would give....I think it was 16 or so ounces of fuel. The 46 will sip compared to the 91.

DW_crash