sidgates

My Feedback: (2)

Do you think you need the epoxy in the air trap to fuel proof it? What filament is OK with Kero?

Viper1GJ

My Feedback: (20)

I don’t know. I just did what Keith did. I’ll ask him to comment with more details. I don’t remember what he said it was printed with.

Bob_B

My Feedback: (11)

Gary who sells the felt clunk I see in the UAT photo?

Viper1GJ

My Feedback: (20)

Bob, I don't know. I asked Keith to post his info when he gets back home.

dwr302

My Feedback: (2)

Finally got the maiden done on the F22. Kind of a pig, what with the 6 cell setup and the extra half pound added with the JP brakes system. But the goal was to get it trimed out and flying straight before starting the turbine conversion. So that's done. A couple of pics to show the JP brakes set up.



The canopy fits right over this battery location.

Bob_B

My Feedback: (11)

FYI, you can power your brakes right from an open RX port

dwr302

My Feedback: (2)

Thanks for the info. I know that is possible to do but I like the idea of keeping the brakes system separate. Another factor in this project is that Freewing says only 5 volts to their blue box and servos while JP says 7.2 V to their brakes.

Viper1GJ

My Feedback: (20)

I use a single 3s LiFe 2200 battery. I've been using a Castle Pro BEC set for 5.7 volts. I run the RX and Freewing airplanes at 5.7 off the BEC and the JP brakes and ECU direct off of the 9.9v LIFe battery. So far everything works great.
Gary

dwr302

My Feedback: (2)

That's a good way to go. I am pretty much gonna copy your setup Gary. I Already have the Castle Pro in hand. Why mess with success? Got a heads up that the X45 will arrive next week. Should have all the pieces then.

yellowbird911

Sorry for the slow reply. The UAT can be printed in PETG or ABS. If printed in clear it is just translucent enough to see bubbles and fuel. I use a SIX10 resin epoxy to coat inside and out. Then epoxy the lines in place and seal tank together. It is not serviceable but for 50 cents you can just replace it. I bought a bag of 10 felt pickup a couple years ago which are used in an ATV or lawn mower type application. Will try to find the part number but any of them will work. Here is the link to the Thingiverse file.

https://www.thingiverse.com/thing:4305344

I used Fusion360 hobbiest software to create the model so legally I can't sell them.

Aussie1

I have the same felt clunk and it was 5 bucks from a lawnmower shop. I think that it fits into a brush cutter tank.

https://www.amazon.com.au/HIPA-Repla.../dp/B00X43DH0K

yellowbird911

These are the ones I'm using but there are many options including metal rock type filters. Many have just used an open tube pick up in the middle of the tank and it seems to work well.

https://www.ebay.com/itm/391897099736

dwr302

My Feedback: (2)

While waiting for the turbine for the Freewing F22 project I have lots of time to think about stuff like how to get the turbine at the same thrust angle as the EDF fan. Not many straight lines for reference on the F22 fuse. Took the indicator off my incidence meter and set it on the fan mount. If I match the reading at the exhaust nozzle on the turbine I should be good.

Helijet

There is actually a seam datum line that follows the mounting blocks. Use that line to the end of the fuse as your center line.

Dw

Viper1GJ

My Feedback: (20)

I just eyeballed the seam line.

Turbulence

My Feedback: (76)

Coming Soon, Global Jet Club Aerofoam 1/8th Scale MIG-17

sidgates

My Feedback: (2)

================================================== =====
Thanks, I use Fusion for model projects also.

Helijet

Hey Ralph

If I could make some suggestions based on my Avios Mig 17 / X45 experience.

- Limit the fuel size to around 35-40 oz max. The Mig only needs around 30N to fly very, very well. The flight time
will easy 8:00 with mixed throttle on 35 oz.
- Cut back on all that turbine mounting wood. Its just added weight. Nix the aluminum heat shield. Add some aluminum tape
if you makes you feel better.

Otherwise I like the easy turbine access. I would buy one if the price is right. I really enjoy flying my Avios version

DW

dwr302

My Feedback: (2)

Gary, I wonder about your weight and balance on the F22 after you added the JP brake set. I saw about an 8 ounce increase when switching to the JP's. and that is aft of the CG of course. When I did a check on mine with the X45 sitting where you put your K45, with the 32 oz. dubro tank sitting 2 inches forward of the book cg, and battery at the nose, plus pump and uat along with a couple ounces of weight to allow for uat fuel weight placed up front it still said add one pound to get book CG! That would would give me approximately 9 lbs dry.

Viper1GJ

My Feedback: (20)

I think that would be about right. I remember the empty weight was 8.4 lbs with out the JP brakes. That was also before I added the MAP 2 oz air trap tank. I think I remember the brakes were 6-8 oz so that's about .5 lb. So about 9 lbs would be correct. I'm away from home till next week. I can put the F-22 on the Xicoy CG machine again and give you the current weight and CG. I'm sure my CG is aft of the book recommendation but not sure by how much.

dwr302

My Feedback: (2)

OK thanks Gary. Sounds like I am in the ball park. Landing weight should still be a little under that of the 8s EDF.

Viper1GJ

My Feedback: (20)

Yep, my 8S weight was 9.6 lbs. So 9 lbs will be fine.
G

dwr302

My Feedback: (2)

Well the turbine mount is done. Gotta say Gary, that your mount design makes a very solid platform. I had milled glass, micro balloons and 30 minute epoxy on hand so used that. Guess that might be considered old school Hysol.

Viper1GJ

My Feedback: (20)

Looks great! Keep photos coming.

dwr302

My Feedback: (2)

The 32 oz. Dubro tank fits pretty well. Back of the tank sits against the spar and the front against the aft end of the cockpit area. A quarter inch shim/bracket above the tank makes for a snug fit for the hatch below. A lug on either side of the hatch will keep it from moving from side to side. The passages down the sides of the tank are greater than the minimum 60mmm diameter area that Gaspar recommends for the X45.