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DIY 1/4 CARS RCMK 600B (finish the unfinished)


fidracing

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In 2013, FID Racing made a concept off-road racer. we recorded the whole process, and posted the whole process in a Chinese forumhttps://www.rcfans.com/thread-552461-1-1.html ), and made a hit. Until now, it is still pinned in the forefront of relevant section. Though years passed, I still think it is worth sharing with more people and show how FID Racing works. In fact, on April 13, 2013, our founder and chief designer Mr. Yang started a post it on rcuniverse forum (  https://www.rcuniverse.com/forum/rc-giant-scale-cars-234/11476521-diy-1-4-cars-rcmk-600b.html ), but due to language, he didn't continue updating until the finish. I'd like to post it here so that more people could see what we make things. 

 

We didn't keep the original documents, so all the pictures are downloaded from the Chinese forum. The shame is all the videos are missing. The fabrication process spans almost 5 months. A lot of pictures. I will translate all the original words he posted in the Chinese forum, so that you won't miss anything. The post will be splitted into several updates, but this time I'll finish it. Any translation mistake, please point out.

 

Beneath is the designer's voice. Hope you'll enjoy it.

 

This is about the whole fabrication process of super off-road racer. It starts from upgrading 2-cylinder engine. Actually I don't know how to determine the scale.

 

First let's do the RCMK 2-cylinder engine. Regarding its dissipation issue, please follow up my post and I'd like to hear your voice.

 

Below is the design. I'll use RCMK 2-cylinder for it.

image.jpeg.70f87ee177308eb975ec541a665e2190.jpeg

1st design is enforced dissipation. Sync belt drives the fan.
cons: 2 cylinders have different dissipation.
pros: it's mechanical.

2.jpg.08b262974f1a746ecdc043161543045f.jpg

2nd design dissipates by 4 large fans.
cons: needs extra power
pros: stable and good dissipation

3.jpg.ed261fa72145282064af1c923f886dcf.jpg

1/4 Super Car, Chapter Engine

1: SKF bearing and Sweden seal ring for retrofiting casing

image.jpeg.d0210f0fdc9928e947cddf0cfe01f281.jpeg

new side cap and casing for pull-start, HV ignition and coil
5.jpg.e79759009e3f538dc89554ef70bd66a2.jpg

2. mount SKF bearing (12 x 32 x 10)
6.jpg.247446de1c38bac4b1e8e05770afc5a9.jpg

assembled up casing
7.jpg.35179015e7c1bfee605265e952312138.jpg

HV ignition
8.jpg.a7058f7d9b36d689143a897c9f238a27.jpg

 

9.jpg.06d38a998caf1e2f3cafa6e15da985da.jpg

install ignition coil
10.jpg.74227c2ee014d0419de8ec4b3d9d4f35.jpg

 

11.jpg.c9fd6f02e629e6b1a7119c07cba00496.jpg

mount cylinder head.
12.jpg.2a06277e40e8c88b2d1f0939565d7302.jpg

 

13.jpg.7aea8a0b96c4f195503d1506a3325752.jpg

fit the clutch mount last
14.jpg.a65c4a8680973a52c8e902b4a7f2a586.jpg

15.jpg.fa4b0296fe36b808314fc06e72a466af.jpg

attach a picture of separate parts
16.jpg.214932aee4797eee489d6e80e71a4572.jpg

 

Chapter engine is over. Waiting for further update!

Chapter aluminum alloy body

First let's have a look at the design. I'll update the pictures on Mar. 22nd, 2013 (it's under Oxidation).

Body Configuration

17.jpg.b1b09f3ffac4d66a373d6a6af000afa9.jpg

18.jpg.839650b79337b82e6e18fcb79f5db3fd.jpg

19.jpg.05fc4634cdf2dd2c0ec81b23d117aaf5.jpg

Below is body aluminum parts:
20.jpg.6b8f38219761cd11a8de0e079616ec22.jpg

21.jpg.877f39a09972be6ffbd75a2962770e2c.jpg

22.jpg.33c667b4501064b3b046b9b7bd58a763.jpg

Update some pictures of metallic parts (before oxidation). My plan is first assembly and then surface treatment after confirmation.

Let's check the chassis length (overall 850mm)

23.jpg.99e0d5789587f9f172e298bf490fec3d.jpg

 

24.jpg.cd40baf76709f083ac17fa6579c1499f.jpg

 

25.jpg

 

Edited by fidracing
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26.jpg.0b6b664fd062e051167e64ecbdfeea9a.jpg

It seems good with the engine on it.
27.jpg.ff4654bec3aa340f40157ee106a5b57e.jpg

 

28.jpg.9fc159d1b081f18caca169e0fd8f5655.jpg

 

Mar. 22nd, 2013 Updates

Chapter Nylon Parts, All CNC Machined

Today I went to factory. CNC is working the side protective boards. Share some finished and unfinished pictures.

Front bumper + front wheel mount + support etc.

29.jpg.7c84d169fce38f23670fcf8c4dcd5e68.jpg

battery box + gearbox cap + rear wheel C mount + small components
30.jpg.777858e382a82e7aafcf72a16f782bc6.jpg

rear support + front bumper + small components
31.jpg.4d17c7cfe6bef7fb35d903b7e13b0ef7.jpg

3 Gearboxes (diff. casing)
32.jpg.a473c5f65f49340cf6e5f967725a0f67.jpg

thickened front suspension
34.jpg.b96e118192dc9934e1ed079bbb884de8.jpg

 

33.jpg.41ceb7d91e03fd09bdf940a936f6df97.jpg

 

body side protective board under fabrication:
the material is more than 80mm thick, fabricated in one-time forming, took 24 hours.

35.jpg.6789e3e3874ffa115f00f93573392aeb.jpg

 

36.jpg.ed365fa29fd66a82bc31defff3377480.jpg

finished product
37.jpg.f7271b666cad0691bcfa0f0c0ac10841.jpg

 

38.jpg

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29 minutes ago, .AJ. said:

Sweet build! Thanks for sharing it on here 👍 

Hope you enjoy it. not finish yet. I'll keep updating.  The original post is very long. I'll compress it.

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To continue

 

Mar. 28, 2013 Update

 

First let's have a look at the star which made me do 3 times.

 

1st sampling

1.jpg.2ed4912e7cc4a381e03964faed612fc6.jpg

 

2.jpg.c9aff7e5da87c5e906a77c2862c78d13.jpg

 

2nd sampling

3.jpg.1829cf26eae65308b3fa876f4902c031.jpg

 

4.jpg.41a42812ae3860062fb2e6f73e2c7f7d.jpg

 

3rd sampling

6.jpg.ecca9c26b496f8a8db906bfa6472f7c6.jpg

 

5.jpg.c8b2725a1b37b527f2ee24dfb8f6c85a.jpg

 

7.jpg.eb8adc94a21d161a65f146af8401ce6d.jpg

 

third time lucky. It meets the designed precision and surface requirement.

attach several pictures of unfinished chassis

14.jpg.9a498928dffe356631bfd56d7cae3bf4.jpg

 

8.jpg.2a54ae596a301b517389cf57fbde4750.jpg

 

9.jpg.1bdc0700daf021a21c630a09accc2206.jpg

 

10.jpg.40b6a47ef7e662e56a8d26d30aa37f4e.jpg

 

11.jpg.926b2cc1e2876503af2bd94489e035e1.jpg

 

12.jpg.0d29b21c01af7c7be7f6d3cd8f087bfd.jpg

 

13.jpg.938c46de3eca880ae934868db72642a0.jpg

 

I'll keep updating. Stay tuned!

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Note: below words are translated from the original Chinese forum by our founder and chief designer Mr. Yang.

 

Thanks for all the support and attention!

Mar.31st, 2013 update is about oxidated alloy parts

 

The chassis parts will adopt Titanium alloy oxidation to render a metallic feel, though it's made of aluminum alloy.

 

1. front section

1.jpg.d2cc958f9331a057568a32d47641bc70.jpg

2. rear section 

2.jpg.4a47120b951ceccc203701a62bb3d5f9.jpg

3. side boards

3.jpg.3faf13e8a584e49e92969c0949234bb0.jpg

4. front diff. bracket

4.jpg.e34a4791f2a0f9cd09a73475c1e81afc.jpg

5. front upper plate support

5.jpg.892ccb7f61572cde14c940844ede98c2.jpg

6. middle diff. bracket

6.jpg.1ca0a506f35ad4c7c883ceecbbf27335.jpg

7. rear diff. bracket

7.jpg.52fdae5427c654289ae1f956d25efefc.jpg

8. steering rod
8.jpg.50b368fecd869569dd5dd22786c7dbf7.jpg

9. rear shock tower

9.jpg.a3777f5235cd06de5a012a5c22b08f27.jpg

 

10.jpg.5fe6671ddcf6df765d77bed77c1a2ca3.jpg

10. big gear plate

11.jpg.6ee91383476b43c17b7d0f73861a54a3.jpg

11. dual steering servo bracket

12.jpg.e9dc9f45aaea1e33ac13b774c4b146a5.jpg

12. throttle servo bracket + 4 wheel hydraulic pump bracket

13.jpg.723f10ba9a2b3bc27f60f3fd85e6f605.jpg

13. twin cylinder engine side brackets

14.jpg.affc8eb0510bf2f5288908b236022f68.jpg

14. front / rear lower arm bracket

15.jpg.1f7e09751ecfd9095d5c2f7dc195c84d.jpg

 

done with alloy parts update

 

The next update is about Nylon Parts

 

 

Edited by fidracing
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4th Update

 

Update on April 4th, 2013 about Nylon Parts
All Nylon Parts finished. Some CVD Parts unfinished yet. 

1. Shock Tower Set similar to HPI Baja

1.jpg.b5e037ea255624215877f186e5f70297.jpg

2. Roll Cage Parts + Steering Parts

2.jpg.a2318ed51994538c3b39697614dc5c9a.jpg

3. Components for fixing servo, tank etc

3.jpg.1b19137e178aed1c5154305ecd56d05e.jpg

4. Battery Box and Radio Holder

4.jpg.426b820d368249b27bdc8667becc68bf.jpg

5. Front Spindle & Spindle Carrier

5.jpg.1de6db7e28a1c6229648d38672a58e93.jpg

6. Gear Cap

6.jpg.f6f9a3c1c20941d82a1a677be2a2d092.jpg

7. Steering Set

7.jpg.939e54cfbb822828742aaa1549842f6e.jpg

8. Front Shock Tower

8.jpg.945db0a8c89e3e29fdab370c0c362b2a.jpg

9. Twin Engine Base Bracket

9.jpg.cd5aa0e5b55948ce6f498e76505f4c8b.jpg

10. Front / Rear Suspension Arms

10.jpg.d65edab45850070b421d828244926d36.jpg

11. Idler Gearbox (capable of upgrading to reverse gearbox)

11.jpg.0ee394c02664006a946f2b8e0057ab3b.jpg

12. Rear Bearing Mount

12.jpg.ce775000fa8f2adf628fc54063de415a.jpg

13. Brackets for servo and chassis

13.jpg.20f0063853cd160885c01972d6c423bf.jpg

14. Roll Cage Joints

14.jpg.711ec06eaa05663a4908916020b4b1f3.jpg

15. Side Fenders

15.jpg.5e5e850d5453a580a5ccffe208549324.jpg

16. Front / Rear Suspension Brackets

16.jpg.1f2344d5818199a25f770c86f4881d76.jpg

 

17.jpg.b336da231b5cea4ab7d84b65700f1bdc.jpg

17. Rear Suspension Lower Arm

18.jpg.fdf2723828656381ce8c21ab5c57bb3d.jpg

18. Rear Bumper With Light

19.jpg.3be177f9ba158b2ff04e506037a4f67f.jpg

19. Front Bumper With Light

20.jpg.4cead16560c39bc1adb017acdf036f1f.jpg

20. Diff. Casing

21.jpg.50e4ca6359cea97215171a9e28ee8523.jpg

21. Rear Bumper Bracket

22.jpg.1f4ac4601d476f96d619306822de4350.jpg

22. Rear Chassis Support

23.jpg.57e11016db3706c495834cb3ff10a9b6.jpg

23. Chassis Fittings

24.jpg.97acaa3362927fed93b7a5973dffa48c.jpg

Assembled Roll Cage

25.jpg.f39cdf691c622f9d19533da430df3995.jpg

 

26.jpg.bc845352a65d7bec391366546950bf81.jpg

 

27.jpg.ae91dbfd19770f488f74b4001d149bfb.jpg

 

28.jpg.959da25b4bbef005346178a98dcf238f.jpg

Too many nylon parts. Its update not done yet. To be continued tomorrow.

Edited by fidracing
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