akschu

My Feedback: (5)

I know there are a few of us out there that have this setup and now that Bob has requested that his thread be closed I figured I would start a new one for the rest of us.

That said, I have my 40GT (its actually the same engine that Bob had, bought it used from Scott) in my yak and have already test fired it. The engine seems to run fine but shakes quiet a bit. I contacted Scott and he said that the synco spark module would make it shake a bit less so I ordered it. Between the timing and carb tuning I expect this engine to be about the same as my 1.60 in the vibration department.

Right now I'm running a apc 18x6w prop I had laying around just to load it for initial testing, but I'm waiting for both Xoar and Skorepa 20x8 props to see which one is better. I also have a very light battery coming so I hope to have everything together and flying by this weekend.

For the spinner I just ordered [link=http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXJUN5&P=Z]one of these[/link] because it is cheap and should fit just fine once I get the bolt for the front. It's backordered so I'll run without a spinner until it comes.

For the rest of you running this setup, have you flown it yet? You happy with the setup? Also, are you guys using the carb stack?

schu

Zippi

My Feedback: (10)

akschu,

I have the Brillelli 40cc installed in my YAK 54 and all the contol surfaces epoxied on. I added a Sullivan tailwheel assembly and had custom CF landing gear made to set it up a little higher so the XOAR 20X8 prop would have better ground clearance. This is my winter project so I'm not pushing to get it finished.

akschu

My Feedback: (5)

I put 3.5" wheels on mine because I really like the looks of the stock gear, it gets the wheel pants off the ground, and because I flew it with a 19" prop stock and didn't have any problems.

Zippi

My Feedback: (10)

akschu,

With the CF gear I had made I now have 3" of ground clearance and on a grass field you need it. It keeps the wood prop from getting green tips. Everyone needs different setups and there all good. It's just what every floats your boat so to speak.

akschu

My Feedback: (5)

I agree, just letting you know what I did.... and yes sometimes the prop gets a tad green, but not to bad....

My field is a little dusty so I need to get some sort of an air filter on it, any ideas?

schu

Zippi

My Feedback: (10)

akschu,

Never had an issue with dust. How about the air filters the guys use on the gas cars?

xxsnookxx

just in case you may not know prop balancing makes a huge difference with vibration make sure your props are properly balanced...you probably knew this but just in case...

Zippi

My Feedback: (10)

Anyone have a video of their QQ YAK 54 73" with the Brillelli 40cc yet? I saw aerobob's video but was just wondering if anyone else had one.

xxsnookxx

id like to know if anybody was crazy enough to try this but bob zipi askchu and i ?just kidding finally figured out my batteries duralite 950mah li-ion with 5.3 v regulator 3.1 oz. with the reg. then fromeco 2400 li-ion with regulator 6 v for the rx 4.8 oz. total was 7.9 oz. could get 6.9 with the 1450mah duralite on rx do you guys think thats enough battery or is the 1 oz. worth the 2400 mah fromeco?

akschu

My Feedback: (5)

I'm using [link=http://www.cheapbatterypacks.com/main.asp?sid=627788&pgid=loosecells]CBP750AA[/link] cells for the ign since the can handle a 20 amp load and because the pack is only 2.1oz. I figure 750mah is plenty, especially when I will get all of the capacity due to the light current draw.

As far as the main batteries I am running a 5 cell HR-5/4FAUP 3200 NiMH pack, but it's heavy, 10oz. I didn't realize it would be that heavy when I ordered it, I was more looking at the size and very low internal resitance. One thing is for sure, the servos work very well with it. Since I spent a little bit of money on it I will probably try it with the gas engine, but if the airplane flys too heavy I can switch to a li-ion setup and loose 5 oz, but I don't know if it's worth the $80 to me.

That said, I would go for the 2500's since that is a bit more flying time for 1oz.

xxsnookxx

i was reading ch ignitions web page they recommend at least 800mah to 1110 mah i saw bob was running a 600 mah on ign. this could of been part of the problem...maybe not...

akschu

My Feedback: (5)

I talked to Scott and he said that it was about 400mah current draw. Since these batteries are rated for 10+ amps I'm thinking I should get at least 1.5 hours out of them. So for me, I think a 750mah battery that weighs 2.125oz and costs $8 is a great setup, though I'm going to cycle them on my charger a few times to make sure I trust them since they are cheap batteries.

As far as why Bob's engine failed, I have made my own determinations (I should, I own the engine now), but I'll keep them to myself since Bob really didn't want to hash it out.

schu

Zippi

My Feedback: (10)

I will be running two 4.8 1800 mAh Ni-MH packs in my plane. I run the same setup in my Giles 202 with the Brillelli 26cc. I get these 1800 mAh packs for $10.00, thats why I use them.

xxsnookxx

does anyone know the size of the stock tank?

Zippi

My Feedback: (10)

xxsnookxx,

I think its is 12 oz?

randy racer

My Feedback: (3)

what all up weight are you getting with the 40cc? mine with the 3W 28 was just over 12lbs. i sold the plane to a budy less engine and he installed a YS140 sport and now i have it back. haven't put it on a scale yet but it should be at least a pound lighter and man what a differance. it flew great at 12lbs but lighter is better. i'm thinking about selling the YS and going back to a OS 160 with a pipe but i would love to run a gas engine.


randy racer

akschu

My Feedback: (5)

randy racer,

It's close but I think the gasser can work. Mine used to have an OS 1.60 but as Bob pointed out the difference in weight between the OS 1.60 w/pitts, pump, and everything else was ~7oz lighter than the brillelli GT40, but much of that can be made up with a smaller gas tank. In the end I expect my plane to only have a 5oz penalty for going gas which I'll live with as glow fuel is expensive and the nearest LHS is an hour away.

If it does fly poorly I have a few things I can do to fix it:

Switch to a HS-81MG throttle servo: .84oz
Switch battery from 3200 nimh to 2000 nihm: 4.35oz
Switch from hitec rx to burg 7p: 1oz
Remove wheel pants: 5oz

So I could take off 11oz pretty fast, and with the cost of fuel, it wouldn't be hard to justify the cost.

I should also note that Bob's plane came out to be 12.2lbs ([link=http://image.rcuniverse.com/forum/upfiles/26509/Mj24554.jpg]See chart[/link]) using pretty light stuff, but it could be even lighter without wheel pants, sulivan tailwheel, ligher batteries, etc....

I guess my point is that with careful selection of parts it is possible to have this plane under 12 lbs even with a gasser on the front. Mine won't come out that light, but if it flys poorly, I can spend a little money and get it light.

Later,
schu

randy racer

My Feedback: (3)

i love gas engines and at 12lbs the yak will fly very well, but at 11lbs its awsome and i think i can get it down to 10.5 with the OS 160. i'm using 1 sevo for the elevators and fromeco battery and reg, no pants(yaks don't wear pants)also have JR 8611's all around. if i used a lighter servos i could save several oz's.
i have a 3W 28cc for sale and a YS 140 sport if any body needs them. both are great engines and almost new.

randy racer

akschu

My Feedback: (5)

If you can get it down to 10.5 lbs with an OS 1.60 then the gasser should only be 11 with the same stuff.

xxsnookxx

any flight reports yet? how are you guys rigging the choke for the brillelli?

akschu

My Feedback: (5)

The carb sticks out of the cowl so I'm not doing anything with the choke, it's right there....

I was planning on flying this weekend, but my CH ignition blew up on me. Something shorted out and it melted the wires and burst my battery.

schu

Dead Eye Dick

Hi Guy's,

I posted back in August on aerobobs closed thread that I was using the ZDZ40RV but couldn't fly till my servos came in. I only use Hitec HS5985MG (the new replacements for HS5945MG) and they came in at the end of September. Maiden flight was yesterday. Very pleased with the flight envelope of this model. Did everything it should. The ZDZ40RV is really over powered (is there such a thing) verticle snaps continued till it was a speck in the clouds! Floated without any tip stall or nasty suprises.

I did find you need alot of expo on aileron low rate. (Very twitchy near neutral). CofG right on the manual 3D button allowed positive and fast pitch control. Interesting I had to place a 3700 nimh subC RX pack just behind the rudder servo to get the CofG right. So much for battery shelf over the engine! I wouldn't have thought the ignition pack would have made that much difference mounted on the firewall side. I don't know the all up weight flying weight. My bathroom scales are inacurrate according to my wife! but I'm not bothered as the performance is spot on with oodles of power in reserve, infact full throttle is redundant unless you enjoy flying at 200mph!

Dead Eye Dick

Maudib

My Feedback: (51)

Nice report Dick...

Sounds great... I really look forward to the ZDZ40F3A which is supposed to come in at 2.4 lbs compared to 2.9lbs for the RV... That's 8 oz lighter! Help with the balance and come in 1/2 lb lighter. The new ZDZ ignition accept a 2 cell lipo direct so I'll have to try one out... maybe a 900mah.

I knew the vertical would be there...

NM2K

My Feedback: (14)

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If you don't mind, how did Bob's engine fail? I just bought a new Brillelli 40cc engine and would like to know what to avoid doing. TIA

Ed Cregger

akschu

My Feedback: (5)

The way the seals in the carb where installed where not quite right. Scott has updated all of them, so what you have is fine.

schu