Did anyone built and run the Cox Venom Clone from http://sites.google.com/site/coxenginecollection?

thanks bud.

I have built one but not using plans from that site. I got the idea to build one from some guy on RC Universe, he said if you mix some Tee Dee Parts with some Golden Bee parts you can get a close to performance venom engine. SO I used the tank assembly and crankcase from the golden bee, the #4 cylinder and piston from the TD and a killer crankshaft from davis diesel. Top it off with a high comp head and a few head shims to play with comp. You got yourself one hell of a engine! I flew it once and that plane went too fast so I went back to the good old babe bee.

I just built one it didn't run very good ether. first that son of a bitch took forever to start second it wouldnt stay running third the needle valve had to be set at like 4 1/2 turns which is alot of turns for a bee type engine forth it only peaked at 14000 rpms (about the rpms of a babe bee) the venom can turn over 23-24000 rpms. It could have been a tight piston cyl assembly as td cylinders can be tight when they are new. I built it matching to the plans, I did hear they can be good runners but mixing cox parts from several different engines can give you some trouble.

I built one of those engines and it ran fine. You can tell it is not a real venom but it sure would fly a plane just fine. It wasn't too cheap to build though. I ended up paying around $120 in parts to build it. The most costly parts was the tee dee cylinder and the black widow tank assembly. I had to buy a black widow engine just to use the tank as the old kits are very rare to come by. That was $45. I would suggest building one as it doesn't look that bad and if its up in the air on a glider or such, you cant tell if its a real one or not.

I did a couple and parts were main problem. #4 piston and liners are hard to come by. Also B/W tank. I used Davis cranks. Now I think Vendors make their own. Looks purdy but have not run it yet.
Dan

dankar04 wrote:I did a couple and parts were main problem. #4 piston and liners are hard to come by. Also B/W tank. I used Davis cranks. Now I think Vendors make their own. Looks purdy but have not run it yet.
Dan

Yeah they are hard to come by! I hear that people are using the modified sure start to TD cylinders but they don't seem to be giving the best performance. I haven't tried the modified cylinders myself so I can't really say. I would think the killer bee crankshafts that Bernie and Matt are selling would be just as good and maybe better then the DD Killer crankshaft although DD have been making them for many many years.
Hope it runs good!

We have a few Black Widow tank kits left.

After doing a lot of testing it seems the cylinder/piston fit is the most important. In addition, it seems a lightened piston, rather than a shortened one is one key in maximizing performance.

Matt

yes how about a piston that is bot shortened and lightened?

The SPI pistons that Matt and I sell are are both shortened and lightened. Together with our standard cylinders, they should give OEM Venom performance.

Matt and I both have the Killer Bee cranks, Tee Dee glow heads and all the other parts, except the stunt tank. However, those are currently in prototype stage and should be available later this year in silver, black and golden colours.

We do stock a few engines that have Venom-like performance.

Bernie
www.coxinternational.ca

really thinking about making a tee dee .049 again?

Yes and no....

Problem is cost in low runs (1,000 - 2,000).

About $40 per engine with box, wrench, instructions and that makes for a $100 retail price, at minimum.

Same problem will arise when the world runs out of old stock Surestart engines. Either by then we have upped retail pricing to at least $40 or we will not be able to manufacture any.

Bernie
www.coxinternational.ca

So the mfgr cost are very high
So to get a .010 made would be about $60 and that is only possible at 1000+ units which makes retail about 160 dollars
Do you have any advice on me getting a .010 crank made for myself and one for AndyW As i owe him one for the diesel head.
Would I be better off contacting a factory or a model engineer?

You have it pretty well right on the 010.

Cranks cost about $4 in batches of 1,000. One crank will probably run you a few 100 $'s as the CNC machine set up time is lengthy. I can put you in touch with factories that make cranks but, really, it will be less expensive to buy a complete engine on eBay.

Bernie
www.coxinternational.ca

So, I guess Tee Dee .09's and .15's are out of the question? (Just kidding!)

It's too bad those engines can't be manufactured again. At least not without a huge amount of money.

AT1984

Cox International wrote:You have it pretty well right on the 010.

Cranks cost about $4 in batches of 1,000. One crank will probably run you a few 100 $'s as the CNC machine set up time is lengthy. I can put you in touch with factories that make cranks but, really, it will be less expensive to buy a complete engine on eBay.

Bernie
www.coxinternational.ca

I meand To get a heavy duty crank made for diesel operation as that is my project but if you have contact for a factory that would be great.

AT1984 wrote:So, I guess Tee Dee .09's and .15's are out of the question? (Just kidding!)

It's too bad those engines can't be manufactured again. At least not without a huge amount of money.

AT1984

It is a shame but if we could onl inspire people to build as when ever I go to the park to fly my cox powered models kids come over and say wow that must have cost like 1000£ and when ibexplain it is far cheaper they're all like wow I got to make one but it is too hard to get the stuff nowadays for them to bother building.

Just send me an email to

support@coxengines.ca

and I'll catch it on Monday. Leaving the office now

Bernie

Ok

I would echo what Bernie had to say.

Getting a few parts made will be very expensive. The machining itself, while expensive, will not be too terrible. The heat treating/grinding operations will be an issue, especially finding someone to perform them in a prototype quantity.

Matt

Yes, do you think i would be better off contacting the like of Ronald valentine to make me a couple of cranks as it should be easy for him and his prices are fair.

nitroairplane wrote:Yes, do you think i would be better off contacting the like of Ronald valentine to make me a couple of cranks as it should be easy for him and his prices are fair.

I think that would be your best bet. Heck, some companies do not want to make only 1000 pieces lol.

Matt