[dan_mitea]

Am vazut la magazin un motor Cox de 0.02 ic. Asta face 0.32 cc. Si nici extrem de scump ~ 90 CAD.
Este intr-adevar o alternativa la un motor electric mai de inceput de gama.
http://www.estesrockets.com/cgi-bin/produc...dv,cat,6,0,1221
Mi-a placut foarte mult cum arata. Domnu' presedinte va rog sa ne spuneti parerea.

[Marinaru]

Coxurile sunt jucarii frumoase!...Personal as alege o versiune Tee Dee(cu aspiratie prin ax)...celelalte versiuni cu membrana in spate au prostul obicei sa schimbe sensul de rotatie in urma unui rateu..functioneaza la fel de bine in ambele sensuri, dar nimeni nu isi doreste sa se intample asta in zbor.

[SILVIU66]

si aici e plin de modele adevarate:

http://www.flyingcirkus.com/

[grig]

The first trials connected with the development of the Rotabuggy consisted of loading a Jeep or, more formally, a Willys Truck 4x4 model MB, with concrete and dropping it from heights up to 2.35m to ascertain the amount of g that could be absorbed without incurring damage. It was found that 11g could safely be accepted, and a two-bladed rotor with a dimeter of 12.40m was the fitted, and a streamlined tail fairing, tailplane and twin fins (no rudders) were applied, together with a "hanging" control column, a rotor tachometer and glider navigational instruments.

The Rotabuggy was first towed along the runway at high speed behind a 4.5l supercharged Bentley, eventually attaining towed airborne speeds up to 105kph IAS, the Rotabuggy becoming airborne for the first time on 16 November 1943. These trials took place at Sherburn-in-Elmet, near Leeds, where, eventually, the Rotabuggy was towed into the air behind a Whitley. The initial test behind the Whitley allegedly left much to be desired, the "hanging" control column threshing about and the "pilot" having to exert all his strength to maintain control.

The initial problems were progressively ironed out, and the general handling and flying qualities of the Rotabuggy were eventually described officially as "highly satisfactory", but the availability of vechicle-carrying gliders rendered further development unnecessary.

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[grig]

inca una

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[grig]

Austrian Raoul Hafner began preliminary work on helicopter models in the mid 1920s, and in 1928 began the design of his first aircraft, the Hafner R.l helicopter Financed by the Scottish cotton millionaire, Major J. A. Coats, this had a comparatively short fuselage and a large diameter (9.14 m/30ft) three-bladed main rotor; power was provided by a 22 4 kW (30-hp) ABC Scorpion flat-twin piston engine. When tested at Vienna in 1930 it was soon found that the gyroscopic action of this rotor was too great and as a result, only a few brief hops were made.

Raoul Hafner's wartime work included the design and development of the Rotachute, a man carrying glider with a rotating wing. Towed by an aircraft to he~ghts of some 1220 m (4,000 ft), it could be piloted in any direction after release. This was seen as a stage in the development of a man carrying 'parachute' with a rotating wing that could be carried in an aircraft in a folded state and would deploy automatically when used in an emergency. Other wartime work was concentrated on the development of a Rotabuggy, basically a 'jeep'-type general-purpose military truck with an easily attached/detached rotary wing that would allow such vehicles to be towed and deployed behind enemy lines. A prototype was flown extensively during 1943-44, but did not become operational. In the postwar years, Raoul Hafner's great experience of rotating wings proved valuable to the Bristol and est;and aircraft companies

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[grig]

The Rotabuggy had a gross weight of 1411kg of which 964kg was the empty weight of the Jeep and 249kg the weight of the rotor unit and tail. The design max speed was 241kph, and estimated rates of descent ranged from 4.9m/s to 10m/s. The minimum take-off and landing speed was 58kph, and basic and max sea level rotor speeds were 230 and 260rpm.

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[dan_mitea]

xorg, la 12 Dec 2004, 23:43, a spus:

dar oare or fi modele stea in 2timpi functzionale in intregime???

In stea inca nu stiu dar uite unul boxer si diesel pe deasupra :

http://www.eichy.de/mobi/FMO%20Boxer%207D(...2)%20%20132.JPG

Este interesant cum regleaza compresia la doi cilindri :) Dar la unul in stea ?


Ar trebui sa aruncati o privire si aici :

http://www.sirtec.ne...al/indexsp.html

Chiar azi ma gandeam daca n-ar fi bun un reductor si la termic........ca deobicei deja s-au gandit altii :D

Aceasta postare a fost editata de Se poate si asa ?: 22 February 2005 - 06:38 PM

[dan_mitea]

Ce-o fi ?

http://www.sirtec.net/micromotori/special/photos/Inline3501.jpg

Aceasta postare a fost editata de Se poate si asa ?: 22 February 2005 - 06:45 PM

[dan_mitea]

Asa ceva am putea face si noi.

http://www.sirtec.net/micromotori/special/photos/Maximizer02.jpg

Singura problema ar fi cu pornitul. Avem de tras la pala de trei ori cu mai multa forta. Dar si motorul s-ar invarti de trei ori mai repede....

Aceasta postare a fost editata de Se poate si asa ?: 22 February 2005 - 06:48 PM

[eleronu]

Primul motor prezentat d tine seamana cu un motor cu piston ROTATIV ! (daca nu stii ce este acela ...da un search cu google)

Al doilea motor... e ingenioasa ideea numai ca am impresia ca ar fi imposibil d pornit la pala pt ca dintii curele nu ar rezista fortelor implicate. Cred ca acest motor este pornit pneumatic cumva ... Daca te uiti mai tent la esapamant ai sa observi ca are un fel de racord. Probabil acolo se cupleaza un fel de "ASPIRATOR"

[dan_mitea]

Acesta-i un motor cu piston rotativ in patru timpi. M-am mai minunat de el :D
Celalalt este ciudat. Sincer nu prea sun lamurit ce-i cu el.

http://www.sirtec.net/micromotori/special/photos/RCV6001.jpg


Cureaua cred ca rezista. Doar ca-i mai greu de dat la pala....de trei ori :o
Daca aspiri pe esapament pistonul va urca pana astupa fereastra si atat.

[MrSpace]

din cate seamana din exterior pare fi un wankel. E o bijuterie exotica si eficienta, insa nu prea fiabila din cate stiu (informatiile sunt cam vechi). In anii 70' mai multe firme au incercat sa il puna pe masini insa a aparut o problema majora, ce nu stiu sa se fi rezolvat: ungerea!

Aceasta postare a fost editata de MrSpace: 22 February 2005 - 10:37 PM

[dan_mitea]

Acesta-i un wankel.


http://www.sirtec.net/micromotori/special/photos/Wankel02.jpg


Celalalt...... Pe fotografie scrie " In-Line "

Aceasta postare a fost editata de Se poate si asa ?: 22 February 2005 - 11:18 PM

[MRX]

Motorul de deasupra celui Wankel este cu cilidru rotativ si este produs de firma britanica RCV (Rotary Cilinder Valve) adica prin rotirea cilindrului se inchid sau deschid ferestrele de admisie si evacuare. Cautati RCV Engines pe Google si va lamuriti cum functioneaza.

[Gans]

Cine ma poate ajuta? Cut planuri ale Me-163C1

[dan_mitea]

MRX, la 23 Feb 2005, 13:50, a spus:

Motorul de deasupra celui Wankel este cu cilidru rotativ si este produs de firma britanica RCV (Rotary Cilinder Valve) adica prin rotirea cilindrului se inchid sau deschid ferestrele de admisie si evacuare. Cautati RCV Engines pe Google si va lamuriti cum functioneaza.

Pai de asta stim. Vorbirea era de cel de deasupra lui. Cel pe care scrie " In line " Il mai pun o data ca s-a uitat subiectul :

http://www.sirtec.net/micromotori/special/photos/Inline3501.jpg

Aceasta postare a fost editata de Se poate si asa ?: 23 February 2005 - 05:14 PM

[Marinaru]

Am vazut pe Ebay mai demult un motor german AERO 35, cu cilidru rotativ...l-am mai cautat acum prin net da nu am mai gasit asa ceva...ce vreau eu sa spun esta ca nu e un concept nou: motorul de care vorbesc e fabricat in anii 50.

[dan_mitea]

Tot rascolind Net-ul dupa Aero 35 sau alte minuni am dat peste
http://www.dself.dsl.pipex.com/MUSEUM/POWE...ryeng.htm#concl
motoare rotative cu abur. Bijuterii tehnice. Din 1910 s-au inregistrat peste 2 000 de patente :)

[Silfax]

Interesant site-ul, dar oare de ce nu s-au dezvoltat concepte pe marginea acestor patente? Cred ca ori s-au dovedit a avea randament mic, ori au fost nefiabile, ori costa ff mult executia lor.

[dan_mitea]

Cred ca ai dreptate. Sigur sunt scumpe si implicit complicate. Deci putin fiabile.....dar sunt niste realizari tehnice deosebite. Sa nu uitam nivelul tehnologic de atunci.


Si sa revenim in prezent. Planoareeeeeee ..... combat.....ornitoptere....si alte bunatati :

http://www.fatlion.c...sailplanes.html

http://www.nesail.com/index.php


O idee excelenta pentru a decola pe camp.....parea mea :

http://www.nesail.com/videos/virus-takeoff...x224-500bit.mpg

Aceasta postare a fost editata de Se poate si asa ?: 28 February 2005 - 05:42 PM

[dan_mitea]

S-a vorbit mai demult aici despre baloane. Cineva chiar avansase ideea unui balon cu aer cald........prilej de amuzament si de explicatii " nu se poate ".
Ba se poate. De fapt se poate aproape orice cu muuuulta munca.

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[dan_mitea]

Ce parere aveti ?

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[dan_mitea]

Sigur nu-i pentru piloti ca mine......dar sper sa invat -_-

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[Silfax]

Cool pasaroiu, adiq baga undeva pe la 300km/h sa inteleg... Chiar ca nu-ti mai trebuie gun... -_-!

[dan_mitea]

Sa revenim la planoare. Un site ce mi-a fost aratat de un bun prieten ( bantuie pe forum sub numele de Aschiuta ) :
http://www.ctie.monash.edu.au/hargrave/coo...ltrec_2004.html

[dan_mitea]

Acelasi bun prieten ( si-i multumesc inca o data ) mi-a aratat astazi :
http://adamone.rchom....com/index2.htm
Daca considerati ca ar fi timpul sa incercam si sa proiectam si astfel sa inchidem cercul este un bun inceput.

Aceasta postare a fost editata de Se poate si asa ?: 28 March 2005 - 05:06 AM

[dan_mitea]

Din ciclul : Unde trebuie sa ajungem. O combinatie perfecta : pilot adevarat + model adevarat.
http://www.rcuniverse.com/vgallery/ si anume
Ultra RC Katana 50

Aceasta postare a fost editata de Se poate si asa ?: 31 March 2005 - 03:56 AM

[dan_mitea]

Uitati-va ce am primit astazi de la prietenul meu.
http://modellvideos.de/videos/KnuffelVerst...p-die-zwote.wmv
Aeromodel ce poate merge inapoi !!!!! Datorita unei elici cu pas variabil.
Nu am cuvinte......

[dan_mitea]

Uitat si elicea :
http://www.hobby-lob...riablepitch.htm
S-a ajuns la 4D.....pe cand 5D ?

Aceasta postare a fost editata de Se poate si asa ?: 20 April 2005 - 05:27 AM