Cox Spyder/ Queen Bee 074

Geist Flieger Thu Apr 19, 2018 7:02 pm

This was my first rc airplane I ever owned. I received this from my folks for X'mas '94 but unfortunately this is not the original plane. I had to find a use for the heavy Qb and this was a good candidate for this tail heavy plane. It flys well but it's more sentimental for me.

NEW222 Thu Apr 19, 2018 8:48 pm

I can clearly remember the article for this in one of the magazine's back in the day. Always wanted one.

Geist Flieger Thu Apr 19, 2018 8:58 pm

Neat lil planes. Flies just like all the other Cox dihedral glider wing airplanes. You can find them on ebay every once in a while. Found mine for $60.

bilchiri Thu Oct 17, 2019 1:51 pm

Hi, i bought a Queen Bee .074, I have only been able to fly it successfully twice in almost 32 years here the video: https://www.youtube.com/watch?v=a1uWI3uhQDg&t=62s

fredvon4 Fri Oct 18, 2019 8:46 am

bilchiri

welcome to CEF Flying

Ghost Flier.....cool plane never seen one of those

getback Fri Oct 18, 2019 9:19 am

Nice looking plane Geist , i know about the sitamintle thing i have way to much ( some call it junk ) hoarding Huh...

Welcome to the Forum bilchiri Nice flight !! RC Plane

ticomareado Fri Oct 18, 2019 9:23 am

You can really tell what New Mexico high altitude (and wind) will do to a model's performance from this video.

aspeed Fri Oct 18, 2019 12:15 pm

Welcome to the forum. There are a lot of complaints about the Queen Bee being heavy and low on power. They are being compared to TDs with no muffler. If the field and neighbors are OK with it, there is a lot more power and less weight with the muffler gone. The hole in the back of the muffler can be opened up a drill size or two as well, if a muffler is needed. It may be wise to see how it runs with no muffler, as there is no tank pressure. You could tell by just removing the muffler pressure line and run a tank with different throttle settings. I ran mine and it was great but I may not have checked the idle without the muffler. It did idle well with the carb mod done. It has been a while since I ran it, but I think the TD .09 head gave a bit more power too. It looks like the Mexican mountain air needs a bit more power.

Surfer_kris Fri Oct 18, 2019 2:40 pm

There is nothing wrong with the Queen Bee, it just needs a proper glow head, those regular plugs are detrimental for power. It is hard to believe that they are still being sold...

With a TD .09 head or a Turbo plug head, these engines will easily match The TT .07GP which is a much more modern design.

1/2A Nut Fri Oct 18, 2019 5:15 pm

Yes Kris is spot on regarding the QB. It has been suffering from a poor adapter plug design
from it's original release date. That adapter plug on a TD .09 does not show the loses as bad
which made folks think it was a QB over all design issue.

Bench Data:
Cox Queen Beast .074 / Kamtechnik Turbo Plug Adapter Test
APC 6x3
Static Peak 19,783 rpm / .214 hp - 158w / 56.2 mph pitch speed
Impressive 23.3 oz - 1.46 lbs. thrust!
OS P4 turbo plug / 25% nitro / 20% oil

Cox Tee Dee .09 / Kamtechnik Turbo Plug Adapter Test
Fora 6.25 x 3.25
Static 20,752 singing steady / 30oz - 1.9 lbs thrust!
.319hp - 234w / 64 mph prop pitch speed
OS P4 turbo plug / 25% nitro / 20% oil

I like the TT .07 and own 3 of them.
Thunder Tiger GP-07 / (standard plug)
Cox 6x3 (may have done better with a APC 6x3)
Static 18,330 rpm / 20.5oz thrust / .172hp / 128.3w / 52 mph prop pitch speed
25% nitro / 20% castor

Small Cox Logo

bilchiri Fri Oct 18, 2019 6:38 pm

aspeed wrote:Welcome to the forum. There are a lot of complaints about the Queen Bee being heavy and low on power. They are being compared to TDs with no muffler. If the field and neighbors are OK with it, there is a lot more power and less weight with the muffler gone. The hole in the back of the muffler can be opened up a drill size or two as well, if a muffler is needed. It may be wise to see how it runs with no muffler, as there is no tank pressure. You could tell by just removing the muffler pressure line and run a tank with different throttle settings. I ran mine and it was great but I may not have checked the idle without the muffler. It did idle well with the carb mod done. It has been a while since I ran it, but I think the TD .09 head gave a bit more power too. It looks like the Mexican mountain air needs a bit more power.

hi aspeed , precisely I found the post of the hole in the carburetor on the net and enlarged the air intake, apart I exchanged the glow plug for a short plug with an idle bar , and make new gaskets from asbestos , and I think it was the solution.

bilchiri Fri Oct 18, 2019 6:45 pm

fredvon4 wrote:bilchiri

welcome to CEF

Ghost Flier.....cool plane never seen one of those

Hello, fredvon4, as many post say, it is difficult to find a plane for this engine, since with the 6x3 propeller it runs quite well, but if you use a 6x4 it seems the performance is greatly reduced, so take a plane 1/2 A from outerzone.com, the weight ready to fly was 520 grams (18.34 oz.) .. regards

bilchiri Fri Oct 18, 2019 7:02 pm

Surfer_kris wrote:There is nothing wrong with the Queen Bee, it just needs a proper glow head, those regular plugs are detrimental for power. It is hard to believe that they are still being sold...

With a TD .09 head or a Turbo plug head, these engines will easily match The TT .07GP which is a much more modern design.

Hi, Surfer_kris, I think it brings some problems of origin, for example at this height , using 25% nitro fuel and 20% oil, it gets very hot, you can even hear the carburetor leftover boiling, I opted for 15% nitro 23% oil and fuel 6x3 master airscrew propeller, to date I already accumulated 4 flights, it seems that I am finding the key to this engine. ....regards

Surfer_kris Sat Oct 19, 2019 2:02 am

I have no experience with high altitudes but a regular short reach plug will be power robber no matter where you are.

It is not the seal itself that is the problem (a well annealed copper gasket will deform well and seal perfectly). It is the fact the seal is in the wrong place. A regular glow plug seals above the threads, so the threads are then actually a part of the combustion chamber. This is a well known problem and it is the reson for not seing a regular glow plug on any of the other Cox engines. I think Cox only put that on their RC engines in some strange attempt at getting a lower idle. So you only see that on the Queen Bee and the TD .09 RC engines, but you cannot fix a bad thing with another bad thing. The solution to a better/lower idle is in the carb, not the glow head.

bilchiri Sat Oct 19, 2019 3:22 pm

Surfer_kris wrote:I have no experience with high altitudes but a regular short reach plug will be power robber no matter where you are.

It is not the seal itself that is the problem (a well annealed copper gasket will deform well and seal perfectly). It is the fact the seal is in the wrong place. A regular glow plug seals above the threads, so the threads are then actually a part of the combustion chamber. This is a well known problem and it is the reson for not seing a regular glow plug on any of the other Cox engines. I think Cox only put that on their RC engines in some strange attempt at getting a lower idle. So you only see that on the Queen Bee and the TD .09 RC engines, but you cannot fix a bad thing with another bad thing. The solution to a better/lower idle is in the carb, not the glow head.

ummmmmh? , I tried the standard glow plug, but it hits with the cylinder head, I'm using the glow adapter that comes originally with the engine, and with the o.s. #8 it doesn't keep the idle? Flying

Surfer_kris Sun Oct 20, 2019 3:13 am

bilchiri wrote: I tried the standard glow plug, but it hits with the cylinder head,

What standard glow plug is that? A long reach plug?

bilchiri wrote:I'm using the glow adapter that comes originally with the engine, and with the o.s. #8 it doesn't keep the idle?

The OS plug is a medium reach plug while the original plug is a short reach plug. The OS#8 might simply bee too cold (it is a medium heat plug).

My advice is to forget anything that takes a regular plug, it simply doesn't work well in terms of power.
Valentine used to make .09 heads for Turbo plugs, but you can also try here: https://kamtechnik.com/product-category/cox-aft/
They (or rather one person, Gregory Kamysz) are making some really high quality products, highly recommended.

1/2A Nut Sun Oct 20, 2019 3:29 am

The .074 / .09 plug adapter has passed testing and should be getting made soon for all to enjoy.

Here is a bench test with the .074 turbo plug adapter.

First run up discovery of what it can do from finding the needle to good rpm.

Posted Aug 14, 2019

Cox Queen Beast .074 / Kamtechnik Turbo Plug Adapter Test
Works with the .074 and Tee Dee .09 This one follows the path
of the turbo plug adapters made for Cox .049 / .051 and Norval
and AP .061 engine. Has the same trumpet shape increased for
the larger displacements.

Static 19,783 rpm / .214 hp - 158w / 56.2 mph pitch speed
Impressive 23.3 oz thrust! APC 6x3 prop
OS P4 turbo plug / 25% nitro / 20% oil
This is now a viable power house well exceeding the TD .051

bilchiri Tue Oct 22, 2019 8:06 pm

1/2A Nut wrote:The .074 / .09 plug adapter has passed testing and should be getting made soon for all to enjoy.

Here is a bench test with the .074 turbo plug adapter.

First run up discovery of what it can do from finding the needle to good rpm.

Posted Aug 14, 2019

Cox Queen Beast .074 / Kamtechnik Turbo Plug Adapter Test
Works with the .074 and Tee Dee .09 This one follows the path
of the turbo plug adapters made for Cox .049 / .051 and Norval
and AP .061 engine. Has the same trumpet shape increased for
the larger displacements.

Static 19,783 rpm / .214 hp - 158w / 56.2 mph pitch speed
Impressive 23.3 oz thrust! APC 6x3 prop
OS P4 turbo plug / 25% nitro / 20% oil
This is now a viable power house well exceeding the TD .051

Seeing your post, I decided to make today a glow adapter using an old long FOX spark plug and a burnt high compression cox glow head, which I have between my irons, and this is what I got with a .049 tee dee with 6x3 MA prop, 15% nitro 23% oil. regards.https://youtu.be/mmIgr6ZdiQ8.

bilchiri Tue Oct 22, 2019 8:11 pm

https://www.youtube.com/watch?v=mmIgr6ZdiQ8&feature=youtu.be

ticomareado Tue Oct 22, 2019 8:15 pm

I'm interested in how you made that plastic tank.

bilchiri Tue Oct 22, 2019 11:28 pm

ticomareado wrote:I'm interested in how you made that plastic tank.

2 oz. eye drop container, 1 small or medium clunk, brass tubbing, neoprene tubbing, plastic tube for the breathing, connect, pass trough the container gap, close thight and....ready ...regards RC Plane

Surfer_kris Wed Oct 23, 2019 6:58 am

It is not a matter of the compression ratio as much as it is the sealing position of the plugs, that's what makes the regular plugs gutless for engines smaller than about .10 ci.

If you have a lathe you can easily convert burnt out stock heads to take Turbo plugs instead;

ticomareado Wed Oct 23, 2019 7:48 am

That's nice work you do there Kris. If you don't have a lathe and want to still squeak by on standard plugs , I once read somewhere that that you can seal them in a tapped out adapter head with RTV sealant in the threads. You'll need several plug/head assemblies in your field box as plug replacement requires some bench muscle, thorough cleaning of threads in head adapter and set up time for RTV.

getback Wed Oct 23, 2019 8:07 am

That sounds like a PIA to me with the silicone , I would bee interested in how to adapt one without a lathe and not mess up the outside ?

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Cox Spyder/ Queen Bee 074

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2 flights in 32 years

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Hole in the carburetor

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