In the meantime i finish my Hellcat and it is ready for maiden.








All little details are done...

Cockpit...







Choke is servo operated...



For flaps I use JR Match Box, with separate battery just for Match Box...





On the top of the cowl is servo which open and close flaps. Big holes will give better cooling...
















Inside is flexible tube for fresh air for carburator area... Two little holes are for scale exhaust cooling...








Plastic fins was add to separate carburator area and for better hot air flow out from cowl...


For better cooling I made hole on the bottom of the fire wall. That hole continues in wings center panel and trough flaps on the bottom of the center panel hot air go out side of model. That flap is workable on servo and it is on same channel with flaps on cowl...



Most of the time I work on engine. As I wrote here last year, my GT 80 with Xoar 24x10 give 12,4 kg of thrust. On model which was 22,5 kg (with fuel) that was very under power.
For this second Hellcat my goal was to made lighter model for which GT 80 will be enough.
New model is just little under 19 kg and I need to add 600 gr lead in the front. Now CG is right like on the plan. I remember that last year, after maiden we removed 700gr lead!!! So, I hope that will be same this year...

For Zenoah GT 80 I choose Xoar 23x8 propeller, and I get 15,5 kg thrust on 7200-7300 rpm on the ground...
On this model I made moving flaps so, area for cooling is much bigger. Also, as you can see on photos, inside of cowl I add two plastic fin to direct hot air outside. Right fin prevent sucking fuel out from carburator.
On the front of the cowl I add plastic for prevent air to come inside in lower part of the cowl. But, one hole with flexible tube send fresh cool air in carburator area...

Hope all that details will help in engine and model performance...


Best regards from Novi Sad, Serbia

Mirce