RE: Brillelli 25GT on CMP Spitfire
 

poco242: I got the GT today. It looks like one of the best engines for quality in the 25cc engine range. I have a feeling....I am going to like it. Thanks Again Capt,n

RE: Brillelli 25GT on CMP Spitfire
 

Take it appart, then you can see the quality inside. The cylinder is so nice inside. The honing is perfectly even. The piston is a work of art as well. You can just tell by the casting of the jug itself how good the quality is. Plus feel how tight the crank it. Very little if any in and out movement. They are quality right up with Echo I think. They are not cheep trimmers like a Homelite. I just wish I could fine a thousand more of them :)

RE: Brillelli 25GT on CMP Spitfire
 

Poco242: What model carbs have you tried on this engine so far? Is the one you normally supply with the GT25 a 13 MM size. Seems like a carb from a Zenoha G26 would be a good one. I May try the one off my Mac MB290 to see what that does for starts. Looks like I should open up the intake manifold or try a bigger one off some other engine? Let me know what you have tried. Thanks John

RE: Brillelli 25GT on CMP Spitfire
 

Finally got the RFI figured out. At first I thought I had it pegged with the aileron extention wire. But it happened again out at the field so I started over looking for problems . I think it was the metal hub on the tail wheel doing alot of the glitching. At certain rpm's it would really get to spinning. Replaced it and the glitches stopped. Here's what I did just to make sure I'd get a good maiden.
First I moved the RX back as far as possible. I then used alum tape and wrapped the RX completely before securing it into the foam and velcroing it in the fuse. I replaced the EI battery with a new one and moved it right up against the firewall. Then I cut some 1/4 inch ultra light ply and covered it with the alum tape . I placed it between the radio equipment and the EI gear. I also used some of the alum tape to shield the antenna before it leaves the fuse and runs outside the plane.
So,,, something as small as a tailwheel can really put a hurt on you if your not careful.

Oh yeah,,, did the valve trick to the carb plate today. I drilled the hole bigger and tap'd it to size a regular muffler pressure valve. Then I soldered it secure and used a Dremel to flush the inside threads. Ran some Tygon back into the fuse. Seemed to help some but I never really had an idle problem. Mine was surging a bit at below mid throttle. The fuel line trick helped some plus I put a new plug in it and re-tuned the carb after the valve/plate mod.
Took it out to the field and used a tow rope to secure the tail this time instead of my metal tail stand. Zero glitching ,, great idle, perfect transition. So I flew it. :D

Ok,,, no video but I'll try to be as decriptive as possible on the maiden post report.


The gasser is much better for takeoffs than the two stroke engines. Less instant torque and more power to ease into the tail up position right before rotation. Was an uneventful roll out even with a 18mph slight cross wind.
The 25cc took it down the runway straight without having to add tons of rudder input like before. I pulled back slightly and it went up. What more can you ask ? A few clicks of aileron trim and one click trim up elev and it was hands off.
Opened the Brillelli full throttle and made several low passes down the active. Very fast for a 12+ LB plane. Sounds better than a two stroke too. Did a few rolls and powered up into a loop taking my time climbing up to check out the vertical. Was very scale as it reached the top of the loop but didn't fall out. The engine just might have a full gallon through it . Scott say's it takes about 4 or 5 gal before they really come to life. Much like a Brison or 3W I figure from seeing and reading other's reports. All and all a very nice scale flight without any low speed fear in the turns. I was worried about that but it flew like any other plane at slower throttle settings. The Spitfire's eliptical wing keeps it flying well and they don't have the snappy stalls quite as bad in slow turns like some of the other thinner winged warbirds.

Ok,, what goes up must come down right ? I had programed my timer for ten minutes and I knew I could get that or more from it but figured I better land it a tad heavy in case my elev rates were too high. The CMP Spit has a bad rep for ballooning on flair caused by over extending the elevator . I dropped the gear and lowered the flaps turning into the final. As I got down into a nice glide pattern and started powering up for final I used a little elev and it ballooned so I ended up aborting at a snails crawl past me. I figured if it will fly this darn slow dirty , then I could raise the flaps and flip on low rates for the elev on the next round. I brought it in crabbed slightly using power to fly it into ground effect until touch down . It rolled about 10 yards and I chopped the throttle and released back elev pressure . Bad mistake because then it came over on it's nose and skidded to a complete stop. The custom shark fins Scott made me really worked. It didn't even break the prop. Just scuffed it a bit . It did however bend the cheapo retracts back about a half inch. But they held strong and wern't loose,, just wouldn't fit back into the wheel wells.

Again,, sorry about no video. But at least we now know what the GT25cc will do on a 12LB warbird.

THE END.

RE: Brillelli 25GT on CMP Spitfire
 

Sturtz: I hope all that work fixed your radio glitches. You know the tail wheel is probabaly close to the end of your antena. Not sure on that. I could see that hapening for sure. Regards Capt,n

RE: Brillelli 25GT on CMP Spitfire
 

The antenna is at the top of the vertical stab. I really think moving the RX back and shielding everything did the trick. I did read several posts about others having trouble with metal hubbed tailwheels in the Gas Engines section and Radio Equipment forum.
Unless I can find a decent set of retracts used,, I'll be bending mine back into shape today. If I just would have kept a tiny bit of throttle going and held back elev slightly it would have been a perfect landing. The extra weight fooled me once. I'll try to be ready for it next time. It's just that it floated in so nice and slow I thought I could chop throttle .

RE: Brillelli 25GT on CMP Spitfire
 

Strutz

glad to here the Spitfire flow well and I understand this issue on landing. I have a Great planes spitfire that is a 46 size that I put a Magnum 70 4 stroke it. It fly's very well, but still has that same issue on landing as yours does. I am glad to here the engine protector Scott made for you worked really well. I am thinking about getting the CMP Corsair and install a Brillelli 25Gt in it. I know you'll have many hours of flying this fine war bird and after knowing yours fly's well I am pretty sure I well be getting the F4U Corsair.:D

RE: Brillelli 25GT on CMP Spitfire
 

Kurt

I just got back from the field and I tried a APC 16x8 prop on my Giles-202. What a difference. Not as much vertical, but the extra speed surely helped in all of the stunts. In fact I am getting 8300RPM with the APC 16x8 and flying very well. I am going to be getting a 17x8 APC prop for the next time I go out and see how that does.

RE: Brillelli 25GT on CMP Spitfire
 

Big thanks goes out to Boxcar. He saw this thread and had pity on me about the retracts. Sold me enough air retracts to keep 3 giant scale warbirds flying at a price I could handle.
Will post flight report when I get these Spring Airs/Robart struts installed. Thanks Ken !!:D

Jim,, glad your getting faster speeds with the 16x8. I went back to the 17x6 and seem to have better slow speed thrust and control now. I bet we both start getting better runs after a few more gallons of fuel.

RE: Brillelli 25GT on CMP Spitfire
 

Flew the Spitfire with the new retracts in high wind conditions yesterday. The GT25cc powered Spit cuts through the winds with no problem. And the retracts/struts held up very nicely.

RE: Brillelli 25GT on CMP Spitfire
 

Kurt,

Sounds like you have a nice flying plane. I am glad the new retracts are working for you. My Giles-202 with the Brillelli 25GT is flying great and the engine is still getting stronger.

RE: Brillelli 25GT on CMP Spitfire
 

jstanton: Is there any weak areas on the Giles 202 I should beef up for a 25cc gas or gas/glow engine? I want her to stay in one piece. Best Regards Capt,n;)

RE: Brillelli 25GT on CMP Spitfire
 

CaptnJohn

I beefed up the engine box with some tri-stock and gorilla glue. I used the tri-stock on the inside of the engine box where the firewall meets the sides on the frame of the box. So far I have had no trouble and I have more that 2 dozen flights on her. That is all I did to strengthen any thing up. The CMP Giles-202 is built pretty well. Good Luck.

RE: Brillelli 25GT on CMP Spitfire
 

Jim: Sounds like the CMP Giles is built pretty good. Not too much needed to be added for strength. I have not heard of many complaints. I got to get mine together. Been to darn busy on other things. Best Regards, Capt,n

RE: Brillelli 25GT on CMP Spitfire
 

CaptnJohn

I forgot to tell you to get the Chip Hyde landing gear for his CAPX. The landing gear on the Giles is weak and will break on a hard landing. When you get the CAPX landing cut it in half, drill your holes and mount it. It will give you an extra inch ground clearance and it 10x stronger. Here is Chip Hydes web page. You'll have to contact them for the landing gear. It is only $20.00 plus shipping.

http://www.chiphyde.com/