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-   -   CY MODELS La-7//Evolution 160 radial (https://www.rcuniverse.com/forum/rc-warbirds-warplanes-200/11640003-cy-models-la-7-evolution-160-radial.html)

warbird04 08-05-2017 11:49 PM

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Ok thank you for the Morris motor link, but I have self modified the Fg-84 in my workshop...and i have the best results now, the motor runs as the stock Fg-90! Ray English modification that you find on you tube was a good basis, i have add another thinks, and now the motor is good. My other hobby is to self build model engines. See picture with some scrap parts that i used for test. I have disassemble the engine more than 50 times to run it good...
The original Saito carburetor has an choke, you must screw the M3.5 choke bar on it, close completly the butterfly, pull the chocke bar and turn the prop several times. That it is, as descripted in the saito manual!

The most big mistake that all people make, is to measure the cylinder temperature with infrared, and this is not reliable and repeatable (problems with china product, reflection color that false the measure, etc). I measure with temperature probs that are mounted on exhaust side, and this on each cylinder. I leave the probes mounted, add an good plug, an i can read the cylinders temperatures on the ground. So i can see if the cylinders overheat, and this with or without cowling. See the picture and the mounted probe on top cylinder, and the measuring bench.

Your cowling opening are good, and you can always first test the motor without or with cowling and see the difference if exist!
I am on work on my La with weathering...i post you pictures next time.

n8622t 08-06-2017 04:44 AM

4 Attachment(s)
It's all I could finish yesterday ...just another day of fun

n8622t 08-06-2017 04:50 AM


Originally Posted by warbird04 (Post 12357858)
Ok thank you for the Morris motor link, but I have self modified the Fg-84 in my workshop...and i have the best results now, the motor runs as the stock Fg-90! Ray English modification that you find on you tube was a good basis, i have add another thinks, and now the motor is good. My other hobby is to self build model engines. See picture with some scrap parts that i used for test. I have disassemble the engine more than 50 times to run it good...
The original Saito carburetor has an choke, you must screw the M3.5 choke bar on it, close completly the butterfly, pull the chocke bar and turn the prop several times. That it is, as descripted in the saito manual!

The most big mistake that all people make, is to measure the cylinder temperature with infrared, and this is not reliable and repeatable (problems with china product, reflection color that false the measure, etc). I measure with temperature probs that are mounted on exhaust side, and this on each cylinder. I leave the probes mounted, add an good plug, an i can read the cylinders temperatures on the ground. So i can see if the cylinders overheat, and this with or without cowling. See the picture and the mounted probe on top cylinder, and the measuring bench.

Your cowling opening are good, and you can always first test the motor without or with cowling and see the difference if exist!
I am on work on my La with weathering...i post you pictures next time.

Hey Warbird, it looks like you are way ahead of me on the Saito subject. I plan on buying one very soon so I may be contacting you when I get my hands on the motor.

n8622t 08-06-2017 04:55 AM

My friend just ran his Saito 90 with the walbro carb from Morris yesterday and although the engine ran fine, it lost 700rpm as compared to the stock carb. The prop was a 24x10 used on both carbs so needless to say he's putting the original carb back on the engine

n8622t 08-06-2017 03:13 PM

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Glad to get these little screws installed and done

n8622t 08-06-2017 03:17 PM

Warbird I noticed in one of your pics that the inner gear doors are attached to a spring....would you mind describing that to me?

warbird04 08-07-2017 05:01 AM

Yes, the spring hold the door in opening position, and that is the wheel who close the door when the gear is retracted. The wheel support on the black stem and hold it in closed position
May be I upgrade the system as the full scale. But the principle is the same, but more reliable. It's a bit more complex to built. See the other La-7 cy models post on rcunivers, it's explain.

n8622t 08-07-2017 07:46 AM

Thank you I'll look at it

n8622t 08-07-2017 07:49 AM

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Now to cut the hatch out for switches and air inlet

n8622t 08-07-2017 07:58 AM


Originally Posted by warbird04 (Post 12358241)
Yes, the spring hold the door in opening position, and that is the wheel who close the door when the gear is retracted. The wheel support on the black stem and hold it in closed position
May be I upgrade the system as the full scale. But the principle is the same, but more reliable. It's a bit more complex to built. See the other La-7 cy models post on rcunivers, it's explain.

sorry warbird but I couldn't see the mechanism you used in the video. I'm assuming that you used a lever off the hinge line opposite the door and attached the spring to that and created an arm for the tire to ride against to force the door closed, does that sound right?

n8622t 08-07-2017 04:44 PM

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Done for the day :)

n8622t 08-07-2017 04:45 PM

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Ready to start tomorrow

warbird04 08-08-2017 06:36 AM

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I use a DuBro hinge, remove the axle, and make a new with piano wire. I make a spring (wire diameter is 0.5mm), outside diameter is aprox 4mm. For best results, i trie to make new spring, and this at left and right from the hinge, this avoids folding of the plastic hinge. Must test for see if better.

n8622t 08-08-2017 09:35 AM

4 Attachment(s)

Originally Posted by warbird04 (Post 12358603)
I use a DuBro hinge, remove the axle, and make a new with piano wire. I make a spring (wire diameter is 0.5mm), outside diameter is aprox 4mm. For best results, i trie to make new spring, and this at left and right from the hinge, this avoids folding of the plastic hinge. Must test for see if better.

thanks for the info warbird .....really nice install!!!
i didn't like how soft the fuse belly was so I added some stringers and a former. Was yours like that??

n8622t 08-08-2017 05:46 PM

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Too much other stuff going on....that's all I could get done today

warbird04 08-09-2017 03:25 AM

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Originally Posted by n8622t (Post 12358661)
thanks for the info warbird .....really nice install!!!
i didn't like how soft the fuse belly was so I added some stringers and a former. Was yours like that??

My fuse belly is soft as yours...but i do not added some enhancement. On the other hand i epoxyed all former again, and specially the firewall. All the wood parts are glued factory side with bad glue... here is necessary to take a look on these glued parts and retake some epoxy if necessary. The worst glued parts is the radio plate, pull on the plate and this go away easly.

You have an good idee with your switch door, I like it.

I send you a picture about the finish painting and weathering, this is in progress on my fuse, the motor cowl is almost ready...

n8622t 08-09-2017 05:05 AM


Originally Posted by warbird04 (Post 12358849)
My fuse belly is soft as yours...but i do not added some enhancement. On the other hand i epoxyed all former again, and specially the firewall. All the wood parts are glued factory side with bad glue... here is necessary to take a look on these glued parts and retake some epoxy if necessary. The worst glued parts is the radio plate, pull on the plate and this go away easly.

You have an good idee with your switch door, I like it.

I send you a picture about the finish painting and weathering, this is in progress on my fuse, the motor cowl is almost ready...

that is an awesome finish warbird !!!

n8622t 08-10-2017 05:02 AM

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Some accomplishment yesterday

n8622t 08-10-2017 12:41 PM

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This switch hatch is kicking my butt!!!

n8622t 08-10-2017 12:43 PM

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Done for the day....

n8622t 08-11-2017 09:30 AM

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Finally!!! It's finished. Now on to the cockpit and canopy

n8622t 08-11-2017 02:16 PM

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Set cockpit location

n8622t 08-11-2017 02:18 PM

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Belly scoop is cut sanded and ready to mount. Glueing it on then calling it a day

n8622t 08-11-2017 02:55 PM

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It's officially 🍺 time

warbird04 08-11-2017 11:25 PM


Originally Posted by n8622t (Post 12359430)
Finally!!! It's finished. Now on to the cockpit and canopy

It's a good result that you have made with this hatch, an you have enough place for connect the plugs...well seen!


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