Stiletto from Corvidae.net

[Jorrit]

Currently we're building two Stiletto speedmodels at my local club. Maybe you're interested also, and therefore I came to the idea of starting a topic here at RC-Groups. Lots of speed fanatics are gathering here and it's always fun to follow somebody building a plane. Hope you'll enjoy it also!

The Stiletto is original a Club20 pylonrace model, powered with a .20 size engine with side-exhaust. Since I don't participate at Pylon-competitions it was possible to exchange the wing for a faster example. It's the same wing that is used on the Kasumi from Corvidae / Jet & Speedmodels.

The models were made from fiberglass and carbon to consolidate the model. Color was sprayed on in the template before adding epoxy resin and glass. Peter Pankras, who has made these models, has added glitter powder to the paint to give it a 'bling' effect. (Just like what they like on MTV )This gives it a very nice finish and looks very cool.


The moulds with paint sprayed, ready to add glass and carbon.
http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_01.jpg

Both sides are soaked in epoxy resin, now the moulds can be closed.
http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_02.jpg

Feels like Christmas, opening the moulds after 24 hours hardening.
http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_03.jpg

The cowl for the tuned pipe to reduce drag.
http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_04.jpg

The fuselage is taken out of the template. Edges need to be finished with a Dremel cutter and gets a warm bad of water to remove PVA and wax.
http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_05.jpg

http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_06.jpg

CNC milled parts from the stab's. It's made of 2 layers balsa with 0,3mm plywood in between. Laminated with epoxy and hinging material was added.
http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_07.jpg

All the components. Styropor core with glass reinforcements between the top layer and core. There is also hinge material added between the top layer and core.
http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_08.jpg

The stabilizer finished.
http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_09.jpg

Jorrit's Stiletto. Quite a hell to make with the silver glitter material. After 5 minutes of laminating you lose track of what you're doing.
http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_10.jpg

http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_11.jpg

This is where the wing is made of. The 24 hours epoxy will be rolled on with a roller.
http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_12.jpg

The epoxy after 15 minutes. It's a sort of foam that fills the gaps completely with a very strong wing as result.
http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_13.jpg


The next day the epoxy resin is cured.
http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_14.jpg

http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_15.jpg

http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_16.jpg



And the Stiletto's ware delivered. Both fuses are very nice. Great finish! Should be looking very cool with the colorscheme I have in mind.

The box, large package.
http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_17.jpg

http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_18.jpg

http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_19.jpg

Unwrapped the materials.
http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_20.jpg

2 masterpieces!
http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_21.jpg

Package of small components with the wingtips, carbon strings, heavy glass, plywood CNC material and an aluminum engine mount for the Rossi 21.
http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_22.jpg



Both Rossi R21 engines arrived! Great service from RC-Technik! 4x APC 6,5x6 props included and 4x Rossi glow plugs R5 and R6.

Package with receipt.
http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_23.jpg

All components gathered for the picture.
http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_24.jpg

http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_25.jpg

Silencer, which silencer? Open tuned pipe!
http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_26.jpg

http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_27.jpg

Great finish looks very good!
http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_28.jpg



Started building the Stiletto.
http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_29.jpg

Pine-wood leading edge. Less fragile compared to balsa.
http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_30.jpg

Wingtips sawed off and sanded into shape.
http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_31.jpg

http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_32.jpg



Both wings glued together at a 3° angle with some 30 min. epoxy.
http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_33.jpg

Gap for the wingspar.
http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_34.jpg

Milled holes free from styropor to fit the servos.
http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_35.jpg

Both holes empty. Only problem is the location of the holes. The Hitec HS85-MG servos are too thick to fit inside the profile, and to fit the hatch on top. The hatch will be sticking out of the profile. The only solution I can think of is using aerodynamic pushrod plates.
http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_36.jpg

Use personal protection while using G4. It's not good for your health.
http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_37.jpg

Added some 80grams fiberglass to reinforce the wing.
http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_38.jpg



This topic needs an update. ;-)

The wing dowels are glued into place
http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_39.jpg

http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_40.jpg

http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_41.jpg

http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_42.jpg

http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_43.jpg

http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_44.jpg

http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_45.jpg

http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_46.jpg


I bought two Hitec Hs81-MG servo's because the Hs85-MG was to big to fit nicely.

http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_47.jpg

http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_48.jpg

http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_49.jpg


The wing, bottom view with fresh G4 and glass. I'm very sure this will work out very well instead of Epoxy.
http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_50.jpg



Upper side is also covered with glass.

http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_51.jpg


Wing sanded and mounted at the fuselage.
http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_52.jpg

Very nice result, very smooth.
http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_53.jpg



I was thinking about how to control the elevator. Using a Y-link is possible, but you need to attach 2 rudderhorns on each side of the elevator, which causes extra drag later on. What do you think about trying to fit the steering rods inside the fuse? It isn't possible to do maintenance after fixing the stabilo with epoxy, but therefore I want to use ball links. What do you advice? I'm not sure about the setup I'm planning to use.

Does anyone have any pictures or ideas how to get this problem solved the best way? I would be very thankful!

Simple drawing. Yellow is epoxy to fix the bended rods.
http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_hoogteroer.jpg

[perttime]

The Corvidae.net site has kept telling me that they are closed until whatever.... Is that site going to be working in the near future?

The planes look neat OK.

[Jorrit]

Thanks! ;)

The owner of Corvidae, Peter Pankras is busy with developing new models. The Blizzard for example will not be produced any longer. Therefore he's building a new website which should be launched soon.

[Jorrit]

My idea was to build in all the complete elevator assembly as shown below. Is this going to work out well on a model which should exceed 300km/h or 180 MPH? Isn't it going to cause 'flutter' because of any slop that may occur?

http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_54.jpg

[pdawg]

Do you guys make these fuselages without all that glitter stuff?

[Jorrit]

Yes, Corvidae also delivers fuselages without glitters. Just plain simple glass/epoxy without gellcoat if you like.

[Julian537]

Where did you get that rossi 21?

[Jorrit]

I ordered the Rossi 21 at Modellmotorentechnik (http://www.modellmotorentechnik.de/) in Germany.

[Jorrit]

Some quotes from my RC-Universe (http://www.rcuniverse.com/forum/m_4160412/mpage_2/key_/tm.htm) thread. I had forgotten to update this thread also.

ORIGINAL: j0rrit

Hey Slomo,

I'm not sure. Club20 is reaching speeds up to 200km/h (125 MPH) using side-exhaust engines which generate more drag. Therefore we use rear-exhaust engines to reduce the amount of possible drag. The Novarossi side-exhaust engines used for Club20 in the Netherlands have an output of 23000rpm. The wing we use is special designed to reduce drag and generate more speed. It doesn't meet the Club20 standards because of that. In the picture below you can see the difference. And since Club20 is reaching speeds of plus 200km/h (125 MPH), we could approach 300km/h (180 MPH) in my opinion. The Stiletto is clocked at speeds above the 300km/h (180 MPH) with a radar-gun, using the same setup as we're using.

If the models are finished we are planning to measure our speeds using the Doppler-effect.

http://www.rc-cropduster.com/users/jorrit/images/stiletto/club20vsspeed.jpg




ORIGINAL: j0rrit

This morning I went to the local DIY-shop to look for a burner and some silver-solder. The cheapest items that I found were pretty expensive. The burner costs €23,- and silver-solder was about €7,- (about $37 together). It’s a lot of money for one simple elevator assembly. So I went for plan B, and bought a tube of Bison Metal Epoxy. Maybe this will work out as well. It should be resistant to vibrations and could cope with a lot of stress. We'll see. I'll test it firmly before mounting it on the Stiletto, but I think the M2 thread is going to be the weak link... If it isn't quite meeting my expectations I will solder it though.

The ingredients:
http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_58.jpg


First I'd make small cuts with a wire cutter to generate more grip. Then I'd grind all components and clean them with some thinner. Afterwards I'd add the Metal Epoxy onto the parts and wrapped steel wire around firmly to give it extra strength. After adding another coat of Metal Epoxy on the outside I was quite confident that this is going to work out, don't you think?
http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_59.jpg







ORIGINAL: j0rrit

I'm going to look for some 6,5x6,5 Graupner props, but I like to compare some setups with each other. I hear Stiletto owners are quite satisfied with the performance of the 7*6w from APC. APC is still plastic, and with that amount of RPM's I like to go for carbon props. The Club20 guys here (same persons that make the MB40 engines) are making their own carbon props in moulds. When I meet them, I'll ask about the possibilities and measurements of the props. The carburetor is for the braking in of the engine, I will use a venturi while flying eventually.

The TruTurn spinners arrived today! They ended up quite expensive. Dutch customs added an extra fee of €20 euros to the whole package. I think they cost about €50,- euros per spinner right now. [:o] And they don't even fit! The crankshaft thread of the Rossi is 6.15mm (almost 1/4" ), and the TruTurn hubs have metric M6 thread which is causing problems. It is impossible to screw it together, so the spinner isn't going to fit. Even the aluminum bushing that came with the spinner is perfectly 6.0mm, so that is also a problem because it doesn't slide over the crankshaft threads. Maybe it's possible to modify the bushing untill it fits, but that doesn't solve the adapter-problem.

Maybe it's possible to get an unprocessed adapter from TruTurn and send them over to Rossi, so they can custom drill and tap the right thread?

Hits and tips are very welcome right now.

http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_61.jpg




ORIGINAL: j0rrit

@ Electric Delta ;),

I've contacted Rossi and they confirmed your story. The Rossi 21 engine has 1/4"x28 threads on the crankshaft. So I've emailed TruTurn about getting 2 new and matching adapters. Hopefully they're willing to send them over for free because their information is inaccurate. Fingers crossed. ;)



Also an update from the silver solder-front. They are finished and ready to mount! [8D]

http://foto.modelbouwforum.nl/albums/userpics/10617/Herschaalde%20kopie%20van%20PICT1220.jpg




ORIGINAL: j0rrit

New problem turned up. [>:]

Besides the TruTurn spinner adapter that isn't going to fit on the 1/4" threads, could someone tell me please where to screw the adapter/prop nut onto? I always thought you should mount the nut onto the crankshaft. Guess I was wrong. :(

http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_62.jpg

http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_63.jpg

Possible solutions:
- Longer crankshaft made by Rossi.
- Conical prop-drive washer from TruTurn so I could use the spinner’s back plate as drive washer instead of the original.

Please help, we are running out of ideas to cope with this problem.




ORIGINAL: Electric Delta

j0rrit,

I would be interested to see your engine and pipe installation in the plane. I am especially
interested to see what header and pipe you are using. I tried my Jett .30 side-exhaust
engine on for size, but the tuned muffler will collide with the leading edge of the wing.
I wouldn't want to mount it with the cylinder to the side, that would look pretty goofy
with the cowl the Stiletto has. I also tried the MVVS .28 with the Rossi pipe, but that
will be too long, and also interfere with the wing. So it looks like I will be using the
MVVS .28 with the MVVS tuned muffler, it looks like it has enough offset to just clear
the wing.

Electric Delta


http://image.rcuniverse.com/forum/upfiles/154903/Jh14915.jpg




ORIGINAL: j0rrit

I made some pictures from the Rossi exhaust we are going to use. That fits quite nice, but there's not much room left. Only 1/4" or 5-6mm space left between the belly-pan and exhaust. I believe the MVVS Tuned Pipe will work out well also! The MVVS engines are nice 'sport' engines for Speedmodels like the Stiletto I believe. They're pretty user friendly and are capable to deliver outstanding power output for the money. The newest model from Corvidae is the Sharky, and the prototype flew with the MVVS .21 rear exhaust. I believe they were quite satisfied with the speed that the setup reached.

http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_exhaust_01.jpg

http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_exhaust_02.jpg

http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_exhaust_03.jpg

http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_exhaust_04.jpg




ORIGINAL: j0rrit

Sounds quite complicated to make. But when it's all coming together it should be sweet!

The new adapters are delivered! :D Only not replaced free of charge, they did claim 27,90$ from my Visa card. So the adapters should cost about €10,75 a piece. But anyhow, we can continue building the Stiletto.
http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_64.jpg

And it fits also. ;)
http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_65.jpg




ORIGINAL: j0rrit

I’d laminate the firewall with some carbon. I'd use plastic, common used to keep kitchen products fresh (the static version) and wrapped it around a peace of wood. Added pressure with some glue clamps and heated the epoxy resin with a paint stripper. I'm quite satisfied with the result.
http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_66.jpg

Here I’d install the firewall in the fuse with some 30 minutes epoxy resin. Afterwards I'd add some extra epoxy and carbon roving in the corners.
http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_67.jpg

http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_68.jpg

http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_69.jpg





ORIGINAL: j0rrit

I test fitted the horizontal stab this afternoon. For a first fit it's quite good. For attaching the M3 ball-link I need to make a 5mm diameter hole. Trough this hole it is possible to add an M3 nut with some special tooling and some loctite. The hole should be covered with some tape for aerodynamic reasons.

Pretty nice aligned
http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_71.jpg

The holes will be filled with epoxy. I'll add some 80 grams glass cloth at both top layers to provide extra strength.
http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_72.jpg

[3D-Novice]

ok so i like to model, so where can i get one?

this is no fair that the site does not work

[perttime]

I love the pictures but there are too many here. I have a pretty decent connection but this thread still takes long to load.

[Jorrit]

To bad that the pictures don’t load fast. No problems with the connection here in the Netherlands. If you like I could send you a complete ZIP or RAR file (4mb) including all photos so far.

Anyway, I'd manage to install the horizontal stab and complete steering assembly. I can secure the ball-link without any problems using a small wrench.

http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_73.jpg

http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_74.jpg

http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_75.jpg

http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_76.jpg

[lever01]

It's not possible to have too many pictures! lol and I want one too.

[Jorrit]

I've covered the horizontal stab with G4 and 25 gram glass cloth.
http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_77.jpg

I filled the gap between elevator and stab with a strip 1mm balsa which should reduce any chance of flutter during flight.
http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_78.jpg



I also finished the belly pan assembly. I'm very pleased with the end result! It aligns excellent with the fuse. It mounts onto the model by 4x M3 allen screws. The screw head is countersinked (right?), so it won’t affect the entire aerodynamics of the model.

http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_79.jpg

http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_80.jpg

http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_81.jpg

http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_82.jpg

http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_83.jpg

[Foamaster :)]

that is just buitiful ...

[GregG]

Have you flown it yet? What RPM are you getting with the APC 6.5 X 6 prop? Or, what prop are you using now and what is the RPM?

[ptxman]

Hi Jorrit

I stumbled on your club-20 build thread. Neat looking model! We fly something similar to those here in Calgary (Alberta, Canada). We have about a dozen races, usually in the snow, to keep our racing thumbs from getting rusty over the winter. :D Mostof the guys are Q500, Q40 and/or F5d pilots in the warmer months. Club-20 is how I got started in pylon a few years ago.

Our fuselages are locally made, based on (I believe) the Tracer design originating from the UK. The guys prefer the high wing configuration vs low mostly for belly landing on frozen ground. They are ugly little mothers but on a short course make for hot competition. I think they hav ebeen radared pretty regularly at 140+ mph. The wings are different configuration but usually balsa covered foam. Ive done some bagging of pink foam & other techniques too. We do have rules restricting size, min thickness etc.

Engines were historically mostly OPS & Webra 20's. Both quit making them so it was hard to find good engines. I ran the MVVS for a bit but its not in the same 22K rpm league as OPS. I have had pretty good runs with the Novarossi SE. This past year we were able to get another batch of new OPS's. The APC 7x6W is the prefferred prop of choice. In a lot of ways I prefer teh RE configuration because you can bury the pipe neatly as in your pictures. I think our rules were set up to prevent running some high prformance screamers (to keep the cost down) like the Jett.

Anyway, good to see crazy people on the other side of the pond!

Regards, Peter

[Jorrit]

Nice to hear that the APC 7x6w is the preferred prop. We're also going to try that particular prop and were hoping for good results. We didn't tested the APC 6.5x6.5 yet and don't have a clue about the rpm. The manufacturer promises it could reach 35.000rpm, but we're happy if we reach 30.000rpm.

Anyway. The project is resumed.

I've made a DIY magnet prop balancer. Needed it also for balancing the fan for my Sniper, but could be pretty handy for balancing the high speed props in the future.

http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_89.jpg

The aileron rods made with ball links. The only play is comming from the gears.
http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_90.jpg

We also need to adjust the Tru-Turn propnut. The Rossi shaft is still too short to fit all needed components. So we will reduce the hex-part of the nut and machine an 8mm bush instead of the hex-area. We will also adjust the prop inner diameter to 8mm so it will fit. Hope the Inventor drawings make it more clearly.

http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_91.jpg

http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_92.jpg

http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_93.jpg


And I also started with painting the Stiletto. Made a small cabin in the garage and started painting. I'm quite satisfied with the results.

http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_94.jpg

http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_95.jpg

http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_96.jpg

http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_97.jpg

http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_98.jpg

http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_99.jpg

http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_100.jpg

http://www.rc-cropduster.com/users/jorrit/images/stiletto/stiletto_101.jpg

[ptxman]

We didn't tested the APC 6.5x6.5 yet and don't have a clue about the rpm. The manufacturer promises it could reach 35.000rpm, but we're happy if we reach 30.000rpm.

Im curoius about that 6.5x6.5 prop. Seems to me it would be a light load, high rpm but maybe outside the power band of a 0.21 CID engine. APC lists it for a 0.10-0.15 CID. Reason I say that is we used to run the regular = narrow blade 7x6. Im not sure if its a sport airfoil vs possibly something better on the the W prop, the 7x6 turned higher rpm (25K) but the 7x6W (@21-22K) pulls much better in the air. In fact we were experimenting with Graupner (7x7) narrow blade but winter tuned into summer & ran out of time :D .

We use about 8mm venturi's & play with pipe plugs to boost tank pressure & maintain head heat.

BTW, the Novarossi's have become very hard to get in North America & also the price jumped up a lot (2X!). The are only available on special order through RC car distributers. Lately we have been able to secure limited numbers of teh old style OPS 21 SE which are also very strong, maybe not quite as tough, but also lighter.

[SpeedFix]

Jorrit - Very nice, you do some nice work building. I especially like you choice for the colour scheme. Love those checkers!! Pls update us on the maiden flight and your engine performance on the 6.5x6 APC :)

Ptxman - Wanted to compare notes with you on prop choice....I have a club 20 racer called Beretta 21 and ordered from the same place Jorrit got his engine. Currently, running a Nova Rossi RX21F/NS ordered thru a RC car distributor here in Asia. Specs of the engine can be viewed here:-http://www.novarossi.com/products/engines/novarossi/plane/rx21fns.html

Ran a Bolly QM4 carbon prop (tach at 26,000 rpm) but never got staight line speed although the engine was screaming. So made some adjustments to the pipe and ran a 7x6 APC (tach at 23,800). Can only unload her on the dive then engine gets too lean....then straight and level she load up again and I lose the speed. Going to experiment with a 6.5x6 APC this weekend to see if she can get some better speed and unloads better. Any experience on the 6.5x6 APC?

[3D-Novice]

i would imagine that if a nelson 40 was turning a 7.4x8 prop, then proportionately the 21 size prop would be somewhere between a 6x7 or 6x8 prop

[SpeedFix]

Thanks....used the 7x6 APC and extended the pipe a little coz it was cut and tuned for the bolly QM4 carbon. She flying like a "Bat out of hell" now. The Rossi's transition to the pipe now is very smooth and sustaining well with no overhaeting and LOTS of power!!.......

[gspylon]

Jorrit, I like the paint scheme on the top of the wing ;)
GS

[flyinkid]

I dont fly gas but its just a beautiful plane very good craftsmanship :)
flyinkid

[pnc]

HEY IS THERE A ELECTRIC if so what size motor?